Configuration Reference

Complete reference for all ConjureDB configuration parameters.

See also: Database Engine · Persistence · Getting Started · PGO

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Overview

ConjureDB is configured entirely through the DbContextBuilder<TContext> fluent API. All settings are applied at database creation time and cannot be changed after Build() / BuildAsync() is called. Each builder instance may be used exactly once — calling Build() or BuildAsync() a second time throws InvalidOperationException.

var db = DbContextBuilder<GameDb>.Create()
    .WithDataDirectory("/data/game")
    .WithSnapshot(snap => snap
        .AutomaticSnapshotInterval(TimeSpan.FromMinutes(5))
        .WithJournaling(j => j.FlushInterval(TimeSpan.FromSeconds(1))))
    .WithEncryption(enc => enc
        .Password("strong-password")
        .KeySizeInBits(256))
    .WithLoggerFactory(loggerFactory)
    .WithMemoryBudgetMB(256)
    .Build();

Configuration Hierarchy

DbContextBuilder<TContext>
├── WithDataDirectory(string)
├── WithSerializer(IBinarySerializer)
├── WithSettingsLoaderFactory(SettingsLoaderFactory)
├── WithLoggerFactory(ILoggerFactory) / WithNullLogger()
├── WithMemoryBudget(long) / WithMemoryBudgetMB(int)
├── WithChangeLogRetainedCapacity(int)
├── WithBatteryStatusProvider(IBatteryStatusProvider)
├── WithDurabilityPolicy(DurabilityPolicy)
├── WithNoPersistence()
├── WithRuntimeMode(ConjureDBRuntimeMode)
├── WithQueryInterceptor(IQueryInterceptor)
├── WithQueryInterceptorFactory(Func<DbContext, IQueryInterceptor?>)
├── WithSnapshot(Action<SnapshotOptionsBuilder>)
│   ├── SerializationBufferSize(int)
│   ├── AutomaticSnapshotInterval(TimeSpan)
│   ├── MaxSnapshotsToKeep(int)
│   ├── EnableIncrementalSnapshots(bool)
│   ├── MaxDeltaChainLength(int)
│   ├── DeltaToFullThreshold(double)
│   └── WithJournaling(Action<JournalOptionsBuilder>)
│       ├── FlushInterval(TimeSpan)
│       ├── MaxJournalFileSize(int)
│       ├── RecordsPerWrite(int)
│       ├── MaxStateChangesBeforeSnapshot(int)
│       ├── BufferSize(int)
│       ├── ChannelCapacity(int)
│       ├── MaxEntrySize(int)
│       ├── SerializationBufferSize(int)
│       ├── SerializationBuffersCount(int)
│       ├── FileStreamBufferSize(int)
│       ├── QueueThresholdForSnapshot(int)
│       ├── DelayBeforeSnapshotMs(int)
│       ├── HighWriteOpsPerSecond(int)
│       ├── MinFlushIntervalMs(int)
│       └── MaxFlushIntervalMs(int)
├── WithEncryption(Action<EncryptionOptionsBuilder>)
│   ├── Password(string)
│   ├── KeySizeInBits(int)
│   └── Salt(string)
├── WithRemoteSnapshot(Action<RemoteSnapshotOptionsBuilder>)
│   ├── RequestTimeout(TimeSpan)
│   ├── MaxRetryAttempts(int)
│   ├── ResolutionStrategy(StateResolutionStrategy)
│   ├── OwnedByContext(IRemoteSnapshotHandler)
│   └── BorrowedByCaller(IRemoteSnapshotHandler)
└── WithMigration(Action<MigrationOptionsBuilder>)
    ├── SnapshotAfterMigration(bool)
    └── VerboseLogging(bool)

Builder Construction

Use DbContextBuilder<T>.Create() as the standard builder entry point. The builder binds to the public TContext(DbConfiguration) constructor, which keeps the same API across desktop/server runtimes and Unity IL2CPP.

Method	Recommended	Description
DbContextBuilder<T>.Create()	✅	Unified builder path. Requires a public TContext(DbConfiguration) constructor.

// Unified builder path for desktop, server, and IL2CPP
var db = DbContextBuilder<GameDb>.Create().Build();

Build Methods

Method	Description
Build()	Synchronous. Blocks until recovery (snapshot + journal replay) completes. Safe for Unity's synchronous init.
BuildAsync()	Asynchronous. Preferred in async contexts. Avoid calling from code with a SynchronizationContext to prevent deadlocks.

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General Settings

DataDirectory

Property	Value
Type	string
Default	Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "db_data")
Builder method	WithDataDirectory(string)

Filesystem path where all persistence files are stored: snapshots (<DataDir>/snapshots/), journals (<DataDir>/journal/), and delta snapshots. Must not be empty or whitespace. Can be absolute or relative.

.WithDataDirectory("/data/game-db")

Note: Ensure the application has read/write permissions to this directory. On mobile platforms, use the application's persistent data path.

Serializer

Property	Value
Type	IBinarySerializer
Default	Built-in MessagePack serializer
Builder method	WithSerializer(IBinarySerializer)

Custom binary serializer for snapshot and journal persistence. The serializer must implement:

public interface IBinarySerializer
{
    byte[] Serialize<T>(T obj);
    void Serialize<T>(IBufferWriter<byte> writer, T obj);
    T Deserialize<T>(ReadOnlyMemory<byte> data);
    T Deserialize<T>(byte[] data);
}

.WithSerializer(new CustomSerializer())

Note: Changing the serializer after data has been persisted will make existing snapshots and journals unreadable. The default MessagePack serializer is recommended unless you have specific requirements.

SettingsLoaderFactory

Property	Value
Type	SettingsLoaderFactory
Default	Default factory (uses DefaultSettingsAccessProvider and MessagePackBinarySerializer)
Builder method	WithSettingsLoaderFactory(SettingsLoaderFactory)

Factory for creating settings loaders used to hydrate non-persistent DbSets that carry a [Settings] attribute. Override to provide custom settings data sources.

.WithSettingsLoaderFactory(new SettingsLoaderFactory(customLoaders, accessProvider, serializerFactory))

LoggerFactory

Property	Value
Type	ILoggerFactory (Microsoft.Extensions.Logging)
Default	NullLoggerFactory (no logging)
Builder methods	WithLoggerFactory(ILoggerFactory), WithNullLogger()

Structured logging factory used by the context, background worker, transaction manager, and persistence layer. Compatible with any Microsoft.Extensions.Logging provider.

// Enable logging with a provider
.WithLoggerFactory(LoggerFactory.Create(builder =>
    builder.AddConsole().SetMinimumLevel(LogLevel.Debug)))

// Explicitly disable logging (default)
.WithNullLogger()

Note: ConjureDB uses ZLogger internally for zero-allocation structured logging. Any ILoggerFactory implementation is accepted.

MemoryBudget

Property	Value
Type	long (bytes) or int (megabytes)
Default	Disabled (no budget tracking)
Builder methods	WithMemoryBudget(long), WithMemoryBudgetMB(int)

Sets a maximum memory allocation budget. When enabled, all allocations are tracked and pressure events are raised at warning (≥90%) and critical (≥100%) thresholds. Allocations that would exceed the budget are rejected.

// Set budget in bytes
.WithMemoryBudget(512L * 1024 * 1024)  // 512 MB

// Set budget in megabytes (convenience)
.WithMemoryBudgetMB(512)

Memory Pressure Levels:

Level	Threshold	Behavior
Normal	< 90% of budget	Normal operation
Warning	≥ 90% of budget	MemoryPressureChanged event fired
Critical	≥ 100% of budget	New allocations rejected, event fired

The MemoryBudget instance is accessible via DbConfiguration.MemoryBudget after build and exposes:

Property / Method	Type	Description
TotalAllocatedBytes	long	Current total allocated bytes (thread-safe)
BudgetBytes	long	Configured budget limit
UsageRatio	double	Current usage as ratio (0.0–∞)
CurrentLevel	MemoryPressureLevel	Current pressure level
MemoryPressureChanged	event	Fired on level transitions
TryAllocate(long, string)	bool	Attempt allocation; returns false if over budget
Release(long)	void	Release previously allocated bytes

ChangeLogRetainedCapacity

Property	Value
Type	int (changes per table per transaction)
Default	1024 (ChangeLogRetention.DefaultRetainedCapacity)
Valid values	A power of two, at least 64
Builder method	WithChangeLogRetainedCapacity(int)

How many changes one transaction can stage into one table and still allocate nothing once that table's change log has grown to hold them. When a transaction ends, each table's log keeps its growth segments up to this capacity and releases the rest to the GC, so a one-off large transaction leaves at most this much behind per table (960 slots beyond the fixed 64-slot first segment by default, about 75 KB for a reference-type row). Raise it for a schema that commits larger transactions every frame; lower it to bound retained memory more tightly. DbContext.TrimMemory() releases what is retained; DbSetMemoryReport.ChangeLogBytes reports it.

.WithChangeLogRetainedCapacity(8192) // frames stage up to 8 192 changes per table without allocating

BatteryStatusProvider

Property	Value
Type	IBatteryStatusProvider
Default	null (disabled)
Builder method	WithBatteryStatusProvider(IBatteryStatusProvider)

Supplies battery charge information so the persistence layer can defer non-critical I/O (automatic snapshots, journal flushes) when the device is low on battery. Designed for mobile/handheld game clients.

public class UnityBatteryProvider : IBatteryStatusProvider
{
    public bool IsBatteryLow() => SystemInfo.batteryLevel < 0.15f
        && SystemInfo.batteryStatus == BatteryStatus.Discharging;
}

// Usage
.WithBatteryStatusProvider(new UnityBatteryProvider())

The interface has a single method:

public interface IBatteryStatusProvider
{
    bool IsBatteryLow();
}

When IsBatteryLow() returns true, the persistence layer defers automatic snapshots and may extend journal flush intervals to conserve battery.

Durability Policy

Durability profiles are configured via WithDurabilityPolicy(DurabilityPolicy). They define how aggressively ConjureDB forces committed journal data to stable storage.

Property	Value
Type	DurabilityPolicy
Default	DurabilityPolicy.FastMobile
Builder method	WithDurabilityPolicy(DurabilityPolicy)

.WithDurabilityPolicy(DurabilityPolicy.CriticalState)

Value	Behavior
FastMobile	Mobile-first default. The journal thread writes each committed transaction through to the OS in the background, without a physical sync. Use CommitAsync(forceFlush: true) when a specific commit must wait for durable journal flush.
CriticalState	Every committed transaction must force the journal to stable storage. Use for purchases, currency, inventory, entitlements, or other state that must fail closed.
ForceFlushEveryCommit	Alias for the strictest policy. Every committed transaction forces durable journal flush before the commit completes.

DurabilityPolicy.CriticalState and DurabilityPolicy.ForceFlushEveryCommit require JournalCorruptionPolicy.Fail. These profiles must fail startup on journal corruption instead of accepting partial replay.

No Persistence

Disable all file-based persistence via WithNoPersistence().

Property	Value
Type	Builder toggle
Default	Disabled
Builder method	WithNoPersistence()

WithNoPersistence() turns off snapshots, journals, and incremental snapshots. Use it for server-side or test contexts where an external system owns durability.

.WithNoPersistence()

Note: Table-level PersistenceType still describes entity intent, but with WithNoPersistence() the builder disables file-based persistence for the whole context instance.

Runtime Mode

Runtime mode is configured via WithRuntimeMode(ConjureDBRuntimeMode).

Property	Value
Type	ConjureDBRuntimeMode
Default	Resolved from AppContext / build defaults
Builder method	WithRuntimeMode(ConjureDBRuntimeMode)

Overrides the runtime mode for the current context.

Value	Behavior
Client	Client-oriented runtime mode. This is the default when no server override is active.
Server	Server-oriented runtime mode. Also sets the process-level ConjureDB.ServerMode AppContext switch.

.WithRuntimeMode(ConjureDBRuntimeMode.Server)

Note: In server builds, overriding back to Client is rejected.

Query Interception

Query interception is configured via WithQueryInterceptor(IQueryInterceptor) or WithQueryInterceptorFactory(Func<DbContext, IQueryInterceptor?>).

Builder method	Description
WithQueryInterceptor(IQueryInterceptor)	Reuses one fixed interceptor instance for all contexts created by the builder.
WithQueryInterceptorFactory(Func<DbContext, IQueryInterceptor?>)	Creates an interceptor per context instance before the operation registry is sealed.

.WithQueryInterceptorFactory(db => new MyQueryInterceptor(db))

See Database Engine for the full IQueryInterceptor contract and result semantics.

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Snapshot Configuration

Snapshot settings are configured via WithSnapshot(Action<SnapshotOptionsBuilder>) or WithDefaultSnapshot().

.WithSnapshot(snap => snap
    .AutomaticSnapshotInterval(TimeSpan.FromMinutes(5))
    .MaxSnapshotsToKeep(5)
    .SerializationBufferSize(128 * 1024)
    .EnableIncrementalSnapshots(true)
    .MaxDeltaChainLength(8)
    .DeltaToFullThreshold(0.4))

Note: Calling WithSnapshot(...) automatically enables snapshot persistence (IsEnabled = true). Use WithDefaultSnapshot() to enable snapshots with all default settings.

Snapshot Parameters

AutomaticSnapshotInterval

Property	Value
Type	TimeSpan
Default	TimeSpan.FromMinutes(5)
Builder method	AutomaticSnapshotInterval(TimeSpan)

Interval between automatic periodic snapshots. Snapshots are taken on the serialized background worker lane after pending commits are applied. Set to TimeSpan.Zero to disable automatic snapshots (manual-only via DbContext.SaveAsync()).

.WithSnapshot(s => s.AutomaticSnapshotInterval(TimeSpan.FromMinutes(10)))

Tip: Shorter intervals reduce data loss window but increase I/O. For games with frequent saves, 1–5 minutes is typical. For idle/background apps, 10–30 minutes may suffice.

MaxSnapshotsToKeep

Property	Value
Type	int
Default	10
Builder method	MaxSnapshotsToKeep(int)

Maximum number of snapshot files retained on disk. When a new snapshot is created and the limit is exceeded, the oldest snapshot is deleted. Applies to both full and delta snapshots.

.WithSnapshot(s => s.MaxSnapshotsToKeep(3))

Note: Keep at least 2–3 snapshots to allow recovery if the latest snapshot is corrupted.

SerializationBufferSize

Property	Value
Type	int (bytes)
Default	65,536 (64 KB)
Builder method	SerializationBufferSize(int)

Initial capacity of the ArrayBufferWriter<byte> used to serialize entities during snapshot writes. The buffer grows automatically if needed, but setting an appropriate initial size avoids reallocation.

.WithSnapshot(s => s.SerializationBufferSize(256 * 1024))  // 256 KB

Tip: Set this to approximately the expected snapshot size. For databases with many large entities, increase to 256 KB–1 MB.

CompressSnapshots

Property	Value
Type	bool
Default	true
Builder method	Not currently exposed on SnapshotOptionsBuilder

Snapshot files are compressed by default in the runtime snapshot format. This is part of the persisted SnapshotOptions contract, but the current fluent configuration builder does not expose a public toggle.

Note: See Persistence for the on-disk snapshot format and option matrix. If a future builder toggle is introduced, it should be documented here as the canonical configuration surface.

EnableIncrementalSnapshots

Property	Value
Type	bool
Default	false
Builder method	EnableIncrementalSnapshots(bool)

When enabled, only entities modified since the last snapshot are written (delta snapshots). Full snapshots are still created periodically based on MaxDeltaChainLength and DeltaToFullThreshold. Significantly reduces snapshot I/O for large databases with low churn.

.WithSnapshot(s => s.EnableIncrementalSnapshots(true))

Note: Delta snapshots require replaying the delta chain on recovery, which increases startup time proportionally to chain length. Balance with MaxDeltaChainLength.

MaxDeltaChainLength

Property	Value
Type	int
Default	10
Builder method	MaxDeltaChainLength(int)

Maximum number of consecutive delta snapshots before a full snapshot is forced. Limits recovery time by bounding the number of deltas that must be replayed during startup.

.WithSnapshot(s => s
    .EnableIncrementalSnapshots(true)
    .MaxDeltaChainLength(5))

Note: Only relevant when EnableIncrementalSnapshots is true. Lower values produce more full snapshots (more I/O) but faster recovery.

DeltaToFullThreshold

Property	Value
Type	double (ratio, 0.0–1.0)
Default	0.5
Builder method	DeltaToFullThreshold(double)

When the ratio of dirty (modified) entities to total entities exceeds this threshold, a full snapshot is created instead of a delta. Prevents delta snapshots from being nearly as large as full snapshots.

.WithSnapshot(s => s
    .EnableIncrementalSnapshots(true)
    .DeltaToFullThreshold(0.3))  // Full snapshot if >30% changed

Note: Only relevant when EnableIncrementalSnapshots is true. A value of 0.5 means a full snapshot is taken when more than half the entities have changed since the last full snapshot.

Snapshot Parameters Summary

Parameter	Type	Default	Description
AutomaticSnapshotInterval	TimeSpan	5 min	Interval between automatic snapshots
MaxSnapshotsToKeep	int	10	Maximum snapshot files retained on disk
SerializationBufferSize	int	64 KB	Initial serialization buffer capacity
CompressSnapshots	bool	true	Runtime default for snapshot file compression
EnableIncrementalSnapshots	bool	false	Enable delta snapshots
MaxDeltaChainLength	int	10	Max consecutive deltas before forced full
DeltaToFullThreshold	double	0.5	Dirty ratio to trigger full snapshot

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Journal (WAL) Configuration

The write-ahead journal provides crash-recovery by recording each committed transaction to disk before secondary index synchronization completes. Journal settings are nested within the snapshot configuration.

.WithSnapshot(snap => snap
    .WithJournaling(j => j
        .FlushInterval(TimeSpan.FromMilliseconds(200))
        .MaxJournalFileSize(4 * 1024 * 1024)
        .MaxStateChangesBeforeSnapshot(500)))

Enabling Journaling

There are two ways to enable the journal:

// With default settings
.WithSnapshot(s => s.WithJournaling())

// With custom settings
.WithSnapshot(s => s.WithJournaling(j => j
    .FlushInterval(TimeSpan.FromMilliseconds(500))))

Journaling is disabled by default. When enabled, the journal is written by the serialized background worker lane after each committed transaction.

Journal Parameters

FlushInterval

Property	Value
Type	TimeSpan
Default	100 ms
Builder method	FlushInterval(TimeSpan)

Base interval between forced flushes of journal data to disk. The actual interval may vary based on the adaptive flush logic (see MinFlushIntervalMs / MaxFlushIntervalMs), battery status, and write activity.

.WithJournaling(j => j.FlushInterval(TimeSpan.FromMilliseconds(500)))

Trade-off: Lower values improve durability (less data loss on crash) at the cost of more I/O and battery drain. Higher values batch more writes but increase the data-loss window.

MaxJournalFileSize

Property	Value
Type	int (bytes)
Default	2,097,152 (2 MB)
Builder method	MaxJournalFileSize(int)

Maximum size in bytes for a single journal file before rotation. When a journal file reaches this size, it is closed and a new file is created. Keeps individual files manageable and aids incremental cleanup.

.WithJournaling(j => j.MaxJournalFileSize(4 * 1024 * 1024))  // 4 MB

RecordsPerWrite

Property	Value
Type	int
Default	16
Builder method	RecordsPerWrite(int)

Number of change records batched into a single write I/O operation. Higher values reduce syscall overhead but increase memory pressure per flush.

.WithJournaling(j => j.RecordsPerWrite(32))

MaxStateChangesBeforeSnapshot

Property	Value
Type	int
Default	100
Builder method	MaxStateChangesBeforeSnapshot(int)

Maximum number of state-change entries (individual entity mutations — Add, Update, Remove) that can accumulate in the journal before automatically triggering a full snapshot. Prevents unbounded journal growth and bounds recovery time.

.WithJournaling(j => j.MaxStateChangesBeforeSnapshot(500))

Note: Each Add, Update, or Remove on an entity counts as one state change. A single Commit() with 10 mutations counts as 10 state changes.

BufferSize

Property	Value
Type	int (bytes)
Default	65,536 (64 KB)
Builder method	BufferSize(int)

Size of the write buffer used to batch multiple journal entries before flushing to disk. Larger buffers improve throughput but increase memory usage and potential data loss on crash.

.WithJournaling(j => j.BufferSize(128 * 1024))  // 128 KB

Tip: Should be aligned with flash storage page size for optimal performance on mobile devices.

ChannelCapacity

Property	Value
Type	int
Default	1024
Builder method	ChannelCapacity(int)

Bounded capacity of the internal Channel<T> used to queue journal entries. When the channel is full, backpressure is applied — writers are blocked until the journal processor catches up.

.WithJournaling(j => j.ChannelCapacity(2048))

Note: Increase for high-throughput systems with bursty write patterns. The default of 1024 is suitable for most game client workloads.

MaxEntrySize

Property	Value
Type	int (bytes)
Default	131,072 (128 KB)
Builder method	MaxEntrySize(int)

Maximum allowed size for a single journal entry. Entries exceeding this size are considered corrupted during recovery and handled according to CorruptionPolicy. Prevents out-of-memory issues from malformed journal data.

.WithJournaling(j => j.MaxEntrySize(256 * 1024))  // 256 KB

Note: Set based on the largest expected legitimate entity size after serialization.

SerializationBufferSize (Journal)

Property	Value
Type	int (bytes)
Default	4,096 (4 KB)
Builder method	SerializationBufferSize(int)

Initial size of the buffer for serializing individual journal entries via MessagePack. If an entry exceeds this size, the buffer automatically expands. Buffers are managed through an object pool (see SerializationBuffersCount).

.WithJournaling(j => j.SerializationBufferSize(16 * 1024))  // 16 KB

Tip: For mobile devices, 4 KB–16 KB is recommended. For systems with large entities, 64 KB+ reduces reallocation frequency.

SerializationBuffersCount

Property	Value
Type	int
Default	4
Builder method	SerializationBuffersCount(int)

Number of serialization buffers maintained in the object pool. Higher values allow more concurrent serialization operations but increase base memory usage.

.WithJournaling(j => j.SerializationBuffersCount(8))

Tip: Increase for high-concurrency scenarios where multiple threads commit simultaneously.

FileStreamBufferSize (Journal)

Property	Value
Type	int (bytes)
Default	4,096 (4 KB)
Builder method	FileStreamBufferSize(int)

Buffer size for FileStream I/O operations when writing to journal files. Smaller values conserve memory; larger values reduce syscall frequency.

.WithJournaling(j => j.FileStreamBufferSize(8 * 1024))  // 8 KB

Note: The default 4 KB is optimized for mobile environments with memory constraints. For desktop/server, 8–64 KB may improve throughput.

QueueThresholdForSnapshot

Property	Value
Type	int
Default	10
Builder method	QueueThresholdForSnapshot(int)

When the number of pending journal records exceeds this threshold, the snapshot trigger is delayed (by DelayBeforeSnapshotMs) to allow the journal queue to drain first. Prevents snapshot I/O from competing with journal writes during bursts.

.WithJournaling(j => j.QueueThresholdForSnapshot(20))

DelayBeforeSnapshotMs

Property	Value
Type	int (milliseconds)
Default	500
Builder method	DelayBeforeSnapshotMs(int)

Delay in milliseconds before taking a snapshot when the journal queue is busy (exceeds QueueThresholdForSnapshot). Allows additional writes to be batched into the same snapshot.

.WithJournaling(j => j.DelayBeforeSnapshotMs(1000))  // 1 second

HighWriteOpsPerSecond

Property	Value
Type	int
Default	100
Builder method	HighWriteOpsPerSecond(int)

Write operations per second threshold that triggers high-throughput mode. When the journal detects write rates above this threshold, it switches to less frequent flushes and larger batches to optimize throughput.

.WithJournaling(j => j.HighWriteOpsPerSecond(500))

MinFlushIntervalMs

Property	Value
Type	int (milliseconds)
Default	100
Builder method	MinFlushIntervalMs(int)

Minimum flush interval for the adaptive flush logic. The journal will not flush more frequently than this, even under heavy write load. Prevents excessive I/O during burst writes.

.WithJournaling(j => j.MinFlushIntervalMs(50))  // More aggressive flushing

MaxFlushIntervalMs

Property	Value
Type	int (milliseconds)
Default	5000
Builder method	MaxFlushIntervalMs(int)

Maximum flush interval for the adaptive flush logic. The journal will flush at least this often, even under low write load, to bound the data-loss window on crash.

.WithJournaling(j => j.MaxFlushIntervalMs(10000))  // 10 seconds max

Adaptive Flush Logic

The journal uses an adaptive flush strategy that adjusts the flush interval based on write activity:

Write Rate ─────────────────────────────────────────────►
                │                    │
  MaxFlushIntervalMs          MinFlushIntervalMs
   (5000 ms)                   (100 ms)
                │                    │
  Low activity ─┤────────────────────┤─ High activity
                │  HighWriteOps/s    │
                │  threshold (100)   │

• Low write rate (below HighWriteOpsPerSecond): Flushes at MaxFlushIntervalMs to conserve I/O.
• High write rate (at or above HighWriteOpsPerSecond): Flushes at MinFlushIntervalMs for durability.
• Battery low: Flush intervals may be extended when IBatteryStatusProvider.IsBatteryLow() returns true.

Journal Corruption Policy

The JournalCorruptionPolicy controls how the recovery handler responds to corrupted journal entries. Configure it through WithJournaling(j => j.CorruptionPolicy(...)).

Value	Behavior
StopAtCorruption	Stop replaying at the first corrupted entry. Recovers all valid entries up to corruption point. (Default)
SkipCorrupted	Resynchronize at a later frame, discard all pending and first post-gap end-delimited transaction changes, then replay only versions after the clean boundary.
Fail	Throw an exception immediately on encountering corruption.

DurabilityPolicy.CriticalState and DurabilityPolicy.ForceFlushEveryCommit require JournalCorruptionPolicy.Fail. These profiles force committed journal data to stable storage and must also fail startup on journal corruption instead of accepting partial replay.

Journal Parameters Summary

Parameter	Type	Default	Description
FlushInterval	TimeSpan	100 ms	Base interval between disk flushes
MaxJournalFileSize	int	2 MB	Max file size before rotation
RecordsPerWrite	int	16	Records batched per write I/O
MaxStateChangesBeforeSnapshot	int	100	State changes before auto-snapshot
BufferSize	int	64 KB	Write buffer size
ChannelCapacity	int	1024	Bounded queue capacity
MaxEntrySize	int	128 KB	Max single entry size
SerializationBufferSize	int	4 KB	Per-entry serialization buffer
SerializationBuffersCount	int	4	Pooled serialization buffers
FileStreamBufferSize	int	4 KB	FileStream I/O buffer
QueueThresholdForSnapshot	int	10	Queue depth to delay snapshot
DelayBeforeSnapshotMs	int	500 ms	Delay before snapshot on busy queue
HighWriteOpsPerSecond	int	100	Ops/sec for high-throughput mode
MinFlushIntervalMs	int	100 ms	Min adaptive flush interval
MaxFlushIntervalMs	int	5000 ms	Max adaptive flush interval
CorruptionPolicy	JournalCorruptionPolicy	StopAtCorruption	Recovery behavior for corrupted journal entries

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Encryption Configuration

ConjureDB supports AES-GCM encryption for all persistence files (snapshots and journals). Encryption is configured via WithEncryption(Action<EncryptionOptionsBuilder>).

.WithEncryption(enc => enc
    .Password("my-strong-unique-password")
    .KeySizeInBits(256)
    .Salt("unique-per-database-salt-value-here"))

Encryption Parameters

Password

Property	Value
Type	string
Default	null (required when encryption is enabled)
Builder method	Password(string)

Encryption password used for AES key derivation via PBKDF2. Required when encryption is enabled. Must be a strong, unique password.

.WithEncryption(enc => enc.Password("secure-password-here"))

Security: Never hardcode passwords in source code. Load from secure storage (e.g., iOS Keychain, Android Keystore, environment variables).

KeySizeInBits

Property	Value
Type	int
Default	256
Allowed values	128, 192, 256
Builder method	KeySizeInBits(int)

AES key size in bits. Higher key sizes provide stronger encryption at a marginal CPU cost.

.WithEncryption(enc => enc
    .Password("secure-password")
    .KeySizeInBits(128))  // Faster, still secure for most use cases

Key Size	Security Level	Performance Impact
128-bit	Strong	Fastest
192-bit	Stronger	Negligible overhead vs 128
256-bit	Strongest	Negligible overhead vs 192

Recommendation: Use 256-bit (default) unless profiling shows encryption as a bottleneck on your target device.

Salt

Property	Value
Type	string
Default	Cryptographically random (32 bytes, Base64-encoded via RandomNumberGenerator)
Builder method	Salt(string)

Cryptographic salt for PBKDF2 key derivation and nonce generation. Must be at least 16 bytes when UTF-8 encoded. Each database instance should use a unique salt.

.WithEncryption(enc => enc
    .Password("secure-password")
    .Salt("my-unique-database-salt-at-least-16-bytes"))

Important: The default generates a new random salt on each instantiation. If you need to read data encrypted in a previous session, you must persist and reuse the same salt. Store it alongside the encrypted data or in platform-secure storage.

You can generate a salt programmatically:

string salt = EncryptionOptions.GenerateRandomSalt();        // 32 bytes (default)
string salt = EncryptionOptions.GenerateRandomSalt(64);      // 64 bytes

Encryption Implementation Details

• Algorithm: AES-GCM (Galois/Counter Mode) — authenticated encryption with associated data (AEAD)
• Chunking: Files are encrypted in 4 KB chunks, each with its own authentication tag
• Key derivation: PBKDF2 from password + salt
• Implementation: BouncyCastle (portable, Unity-compatible — no platform-specific crypto APIs)
• Custom streams: IProtectedFileStreamFactory can be overridden for platform-specific encryption (e.g., iOS Keychain integration)

Encryption Parameters Summary

Parameter	Type	Default	Description
Password	string	null (required)	PBKDF2 key derivation password
KeySizeInBits	int	256	AES key size: 128, 192, or 256
Salt	string	Random (32 bytes)	Key derivation salt (≥16 bytes UTF-8)

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Remote Sync Configuration

Remote snapshot sync enables cloud save / backup functionality. Configured via WithRemoteSnapshot(Action<RemoteSnapshotOptionsBuilder>).

.WithRemoteSnapshot(remote => remote
    .OwnedByContext(new CloudSaveHandler())
    .RequestTimeout(TimeSpan.FromSeconds(30))
    .MaxRetryAttempts(5)
    .ResolutionStrategy(StateResolutionStrategy.RemoteFirst))

Remote Sync Parameters

Remote Snapshot Handler Lifetime

Registration	Builder method	Disposal owner
Context-owned	OwnedByContext(IRemoteSnapshotHandler)	The created DbContext after snapshot work drains
Caller-borrowed	BorrowedByCaller(IRemoteSnapshotHandler)	The caller, after its context has stopped using the handler

Handler implementations upload and download remote snapshots. Choose ownership deliberately: inline handlers normally use OwnedByContext, while a handler shared with other services uses BorrowedByCaller and remains the caller's responsibility to dispose.

public interface IRemoteSnapshotHandler : IAsyncDisposable
{
    Task<ulong?> GetRemoteVersionAsync();
    Task LoadSnapshotAsync(DbContext context);
    Task UploadSnapshotAsync(DbContext context, ulong version);
    ValueTask DisposeAsync();
}

RequestTimeout

Property	Value
Type	TimeSpan
Default	null (no timeout)
Builder method	RequestTimeout(TimeSpan)

HTTP request timeout for remote snapshot operations (upload, download, version check).

.WithRemoteSnapshot(r => r.RequestTimeout(TimeSpan.FromSeconds(30)))

MaxRetryAttempts

Property	Value
Type	int
Default	3
Builder method	MaxRetryAttempts(int)

Maximum number of retry attempts for failed remote snapshot operations before giving up.

.WithRemoteSnapshot(r => r.MaxRetryAttempts(5))

ResolutionStrategy

Property	Value
Type	StateResolutionStrategy
Default	RemoteFirst
Builder method	ResolutionStrategy(StateResolutionStrategy)

Conflict resolution strategy when local and remote snapshot versions diverge.

Strategy	Behavior
LocalFirst	Use local state unless remote is strictly newer
RemoteFirst	Prefer remote state (Default)
ForceLocal	Always use local state, ignore remote
ForceRemote	Always use remote state, overwrite local

.WithRemoteSnapshot(r => r.ResolutionStrategy(StateResolutionStrategy.ForceRemote))

Remote Sync Parameters Summary

Parameter	Type	Default	Description
OwnedByContext	IRemoteSnapshotHandler	—	Upload/download handler disposed by the created context
BorrowedByCaller	IRemoteSnapshotHandler	—	Upload/download handler retained and disposed by its caller
RequestTimeout	TimeSpan?	null	HTTP request timeout
MaxRetryAttempts	int	3	Max retries on failure
ResolutionStrategy	StateResolutionStrategy	RemoteFirst	Conflict resolution strategy

---

Migration Configuration

Schema migration settings are configured via WithMigration(Action<MigrationOptionsBuilder>).

.WithMigration(m => m
    .SnapshotAfterMigration(true)
    .VerboseLogging(true))

Migration Parameters

SnapshotAfterMigration

Property	Value
Type	bool
Default	true
Builder method	SnapshotAfterMigration(bool)

When enabled, automatically takes a full snapshot after migrations are applied so that subsequent startups do not need to re-run migrations. Recommended to keep enabled.

.WithMigration(m => m.SnapshotAfterMigration(true))

VerboseLogging

Property	Value
Type	bool
Default	false
Builder method	VerboseLogging(bool)

Enables detailed logging of each migration step for debugging schema evolution issues. Requires an active ILoggerFactory to see output.

.WithMigration(m => m.VerboseLogging(true))

Migration Parameters Summary

Parameter	Type	Default	Description
SnapshotAfterMigration	bool	true	Auto-snapshot after migration
VerboseLogging	bool	false	Detailed migration logging

---

Configuration Examples

Minimal Configuration (In-Memory Only)

No persistence — data lives only in memory. Fastest startup, zero I/O.

var db = DbContextBuilder<GameDb>.Create()
    .Build();

Snapshot-Only Persistence

Periodic snapshots without journaling. Simple and low-overhead, but data since the last snapshot is lost on crash.

var db = DbContextBuilder<GameDb>.Create()
    .WithDataDirectory("game_data")
    .WithSnapshot(s => s
        .AutomaticSnapshotInterval(TimeSpan.FromMinutes(5))
        .MaxSnapshotsToKeep(5))
    .Build();

Production Game Client

Full durability with journaling, encryption, incremental snapshots, and memory budget.

var db = DbContextBuilder<GameDb>.Create()
    .WithDataDirectory(Path.Combine(
        Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData),
        "MyGame", "db"))
    .WithSnapshot(s => s
        .AutomaticSnapshotInterval(TimeSpan.FromMinutes(3))
        .MaxSnapshotsToKeep(5)
        .EnableIncrementalSnapshots(true)
        .MaxDeltaChainLength(5)
        .DeltaToFullThreshold(0.3)
        .SerializationBufferSize(128 * 1024)
        .WithJournaling(j => j
            .FlushInterval(TimeSpan.FromMilliseconds(200))
            .MaxStateChangesBeforeSnapshot(500)
            .MaxJournalFileSize(4 * 1024 * 1024)
            .BufferSize(64 * 1024)))
    .WithEncryption(enc => enc
        .Password(SecureStorage.GetPassword())
        .KeySizeInBits(256)
        .Salt(SecureStorage.GetSalt()))
    .WithMemoryBudgetMB(256)
    .WithLoggerFactory(loggerFactory)
    .Build();

Unity Mobile Game (AOT-Safe)

Configuration tailored for mobile: unified builder path, battery awareness, conservative memory.

var db = DbContextBuilder<GameDb>.Create()
    .WithDataDirectory(Application.persistentDataPath + "/db")
    .WithSnapshot(s => s
        .AutomaticSnapshotInterval(TimeSpan.FromMinutes(5))
        .MaxSnapshotsToKeep(3)
        .SerializationBufferSize(32 * 1024)
        .WithJournaling(j => j
            .FlushInterval(TimeSpan.FromMilliseconds(500))
            .MaxStateChangesBeforeSnapshot(200)
            .MaxJournalFileSize(1 * 1024 * 1024)
            .BufferSize(32 * 1024)
            .SerializationBufferSize(4 * 1024)
            .SerializationBuffersCount(2)
            .FileStreamBufferSize(4 * 1024)
            .ChannelCapacity(512)))
    .WithEncryption(enc => enc
        .Password(GetEncryptionPassword())
        .KeySizeInBits(256))
    .WithBatteryStatusProvider(new UnityBatteryProvider())
    .WithMemoryBudgetMB(128)
    .Build();

Development / Debug

Verbose logging, no encryption, fast snapshots for iteration.

var db = DbContextBuilder<GameDb>.Create()
    .WithDataDirectory("dev_data")
    .WithSnapshot(s => s
        .AutomaticSnapshotInterval(TimeSpan.FromSeconds(30))
        .MaxSnapshotsToKeep(3)
        .WithJournaling())
    .WithLoggerFactory(LoggerFactory.Create(builder =>
        builder.AddConsole().SetMinimumLevel(LogLevel.Debug)))
    .WithMigration(m => m.VerboseLogging(true))
    .Build();

High-Write Workload

Optimized for applications with frequent mutations (e.g., real-time simulation, trading).

var db = DbContextBuilder<GameDb>.Create()
    .WithDataDirectory("highwrite_data")
    .WithSnapshot(s => s
        .AutomaticSnapshotInterval(TimeSpan.FromMinutes(10))
        .MaxSnapshotsToKeep(5)
        .EnableIncrementalSnapshots(true)
        .MaxDeltaChainLength(3)
        .DeltaToFullThreshold(0.2)
        .SerializationBufferSize(256 * 1024)
        .WithJournaling(j => j
            .FlushInterval(TimeSpan.FromMilliseconds(50))
            .MaxJournalFileSize(8 * 1024 * 1024)
            .RecordsPerWrite(64)
            .MaxStateChangesBeforeSnapshot(2000)
            .BufferSize(256 * 1024)
            .ChannelCapacity(4096)
            .MaxEntrySize(256 * 1024)
            .SerializationBufferSize(64 * 1024)
            .SerializationBuffersCount(8)
            .FileStreamBufferSize(64 * 1024)
            .HighWriteOpsPerSecond(1000)
            .MinFlushIntervalMs(25)
            .MaxFlushIntervalMs(2000)))
    .WithMemoryBudgetMB(1024)
    .Build();

Cloud Save with Remote Sync

Persistent local database with cloud backup.

var db = DbContextBuilder<GameDb>.Create()
    .WithDataDirectory("cloud_game_data")
    .WithSnapshot(s => s
        .AutomaticSnapshotInterval(TimeSpan.FromMinutes(5))
        .MaxSnapshotsToKeep(5)
    .WithJournaling())
    .WithRemoteSnapshot(r => r
        .OwnedByContext(new MyCloudSaveHandler(httpClient))
        .RequestTimeout(TimeSpan.FromSeconds(30))
        .MaxRetryAttempts(5)
        .ResolutionStrategy(StateResolutionStrategy.RemoteFirst))
    .WithEncryption(enc => enc
        .Password(SecureStorage.GetPassword()))
    .Build();

---

Configuration Best Practices

Journal vs. Snapshot-Only

Consideration	Snapshot-Only	Snapshot + Journal
Data loss window	Up to AutomaticSnapshotInterval	Up to FlushInterval (ms)
Disk I/O	Periodic large writes	Continuous small writes
Recovery time	Fast (single file read)	Snapshot + journal replay
Complexity	Simple	More tuning parameters
Recommended for	Development, non-critical data	Production, user-facing data

Rule of thumb: If losing 5 minutes of data is unacceptable, enable journaling.

Memory Budget Sizing

Scenario	Recommended Budget
Mobile casual game	64–128 MB
Mobile RPG / strategy	128–256 MB
Desktop game client	256–512 MB
Desktop simulation	512 MB–2 GB

Subscribe to MemoryPressureChanged to react to pressure levels:

budget.MemoryPressureChanged += (sender, args) =>
{
    if (args.Level == MemoryPressureLevel.Warning)
        EvictCaches();
    else if (args.Level == MemoryPressureLevel.Critical)
        ReduceEntityPools();
};

Encryption Performance Impact

AES-GCM encryption adds overhead to all persistence I/O:

Operation	Overhead (approximate)
Snapshot write	5–15% slower
Snapshot read	5–15% slower
Journal write	3–10% per entry
Journal read (recovery)	3–10% per entry

The chunked 4 KB encryption means overhead scales linearly with data size. For most game clients, the overhead is negligible compared to serialization cost.

Flush Interval Tuning

Scenario	FlushInterval	MinFlushIntervalMs	MaxFlushIntervalMs
Maximum durability	50 ms	25 ms	1000 ms
Balanced (default)	100 ms	100 ms	5000 ms
Battery-friendly	500 ms	200 ms	10000 ms
High throughput	100 ms	50 ms	3000 ms

Incremental Snapshot Tuning

Workload	DeltaToFullThreshold	MaxDeltaChainLength
Low churn (< 5% entities change between snapshots)	0.5	10
Medium churn (5–20%)	0.3	5–8
High churn (> 20%)	0.2	3–5
Batch imports	0.1	2

---

All Parameters Quick Reference

General

Parameter	Default	Builder Method
DataDirectory	<BaseDir>/db_data	WithDataDirectory(string)
Serializer	MessagePack	WithSerializer(IBinarySerializer)
SettingsLoaderFactory	Default factory	WithSettingsLoaderFactory(SettingsLoaderFactory)
LoggerFactory	NullLoggerFactory	WithLoggerFactory(ILoggerFactory)
MemoryBudget	Disabled	WithMemoryBudget(long) / WithMemoryBudgetMB(int)
BatteryStatusProvider	Disabled	WithBatteryStatusProvider(IBatteryStatusProvider)

Snapshot

Parameter	Default	Builder Method
AutomaticSnapshotInterval	5 min	AutomaticSnapshotInterval(TimeSpan)
MaxSnapshotsToKeep	10	MaxSnapshotsToKeep(int)
SerializationBufferSize	64 KB	SerializationBufferSize(int)
CompressSnapshots	true	Runtime default only (no fluent builder toggle)
EnableIncrementalSnapshots	false	EnableIncrementalSnapshots(bool)
MaxDeltaChainLength	10	MaxDeltaChainLength(int)
DeltaToFullThreshold	0.5	DeltaToFullThreshold(double)

Durability

Parameter	Default	Builder Method
DurabilityPolicy	FastMobile	WithDurabilityPolicy(DurabilityPolicy)

Journal (WAL)

Parameter	Default	Builder Method
FlushInterval	100 ms	FlushInterval(TimeSpan)
MaxJournalFileSize	2 MB	MaxJournalFileSize(int)
RecordsPerWrite	16	RecordsPerWrite(int)
MaxStateChangesBeforeSnapshot	100	MaxStateChangesBeforeSnapshot(int)
BufferSize	64 KB	BufferSize(int)
ChannelCapacity	1024	ChannelCapacity(int)
MaxEntrySize	128 KB	MaxEntrySize(int)
SerializationBufferSize	4 KB	SerializationBufferSize(int)
SerializationBuffersCount	4	SerializationBuffersCount(int)
FileStreamBufferSize	4 KB	FileStreamBufferSize(int)
QueueThresholdForSnapshot	10	QueueThresholdForSnapshot(int)
DelayBeforeSnapshotMs	500 ms	DelayBeforeSnapshotMs(int)
HighWriteOpsPerSecond	100	HighWriteOpsPerSecond(int)
MinFlushIntervalMs	100 ms	MinFlushIntervalMs(int)
MaxFlushIntervalMs	5000 ms	MaxFlushIntervalMs(int)

Encryption

Parameter	Default	Builder Method
Password	null (required)	Password(string)
KeySizeInBits	256	KeySizeInBits(int)
Salt	Random (32 bytes)	Salt(string)

Remote Sync

Parameter	Default	Builder Method
Context-owned handler	null	OwnedByContext(IRemoteSnapshotHandler)
Caller-borrowed handler	null	BorrowedByCaller(IRemoteSnapshotHandler)
RequestTimeout	null	RequestTimeout(TimeSpan)
MaxRetryAttempts	3	MaxRetryAttempts(int)
ResolutionStrategy	RemoteFirst	ResolutionStrategy(StateResolutionStrategy)

Migration

Parameter	Default	Builder Method
SnapshotAfterMigration	true	SnapshotAfterMigration(bool)
VerboseLogging	false	VerboseLogging(bool)