Summary information |
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|---|---|
Default value |
0 |
Range of values |
0 – size of shared memory file system (shmfs) in 2K pages |
Status |
Dynamic – when increasing cache size Static – when decreasing cache size |
Display level |
Comprehensive |
Required role |
System Administrator |
The extended cache size parameter specifies the size of the global secondary data cache for 32-bit Enterprise Linux operating systems. Specifying a secondary data cache increases the amount of memory available to Adaptive Server, and improves performance by reducing the need to access the disk. Without the secondary data cache, Adaptive Server is limited to the 2.7GB of available memory allowed by Linux.
To create a secondary data cache, operating system commands must first be used to create a shared memory file system (shmfs) of up to 16GB for AS 2.1 operating systems and 64GB for RHEL 3 operating systems. Adaptive Server creates the secondary cache file when:
The secondary cache is enabled by setting extended cache size to a value greater than zero.
Adaptive Server starts up and the value of extended cache size is greater than zero.
When the value of extended cache size is zero, Adaptive Server does not use or create a secondary data cache.
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