Enum WriteAheadLogMode
Available write ahead log modes.
Namespace: Tenray.ZoneTree.Options
Assembly: ZoneTree.dll
Syntax
public enum WriteAheadLogMode : byteFields
| Name | Description |
|---|---|
| AsyncCompressed | AsyncCompressed mode write ahead log does not directly write and flush the log entries to the device. Entries are kept in memory and written to the device in another thread. AsyncCompressed mode improves the performance with the cost of reduced durability (crashes might cause data loss.) AsyncCompressed mode writes to the WAL with compression enabled. |
| None | No Write Ahead Log. Nothing is saved to the WAL file. Every inserts stay in memory. Data in memory can disappear on process crashes / terminations or power cuts. It is still possible to save in memory data to the disk segments using MoveMutableSegmentForward and StartMergeOperation methods in IZoneTreeMaintenance. |
| Sync | Sync mode write ahead log ensures that the data is flushed to the device immediately. It provides maximum durability in case of a crash/power cut, but slower write speed. |
| SyncCompressed | Sync mode with compression. It provides faster write speed but less durability. (crashes might cause data loss.) |