Stable Queue Manager Performance Enhancements
The Stable Queue Manager (SQM) performance has been enhanced
to include stable queue caching, segment preallocation, and support for direct I/O file access.
- Stable Queue Caching
Replication Server uses a simple caching mechanism to optimize I/O. This mechanism reduces write latency and improves reader speed, since data can usually be read quickly from the cache.
- Segment Preallocation
Replication Server 15.1 preallocates segments in the background to reduce segment allocation latency. Segment allocation imposes significant latency to writer threads especially when the RSSD is on a remote Adaptive Server.
- Support for Direct I/O File Access
For file system partitions, direct I/O reduces the I/O latency as compared to the synchronous I/O, DSYNC.
Created May 23, 2012. Send feedback on this help topic to Sybase Technical Publications:
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