IMS 12 - GSE Belux
IMS 12 - GSE Belux
IMS 12 - GSE Belux
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Logging Enhancements<br />
Previous versions of <strong>IMS</strong> allowed the log buffers above the 2-<br />
gigabyte boundary in real storage<br />
• Extended Format Support for OLDS and SLDS (Optional)<br />
– Allows OLDS and SLDS to be striped<br />
• Increased logging speed<br />
• Log buffers moved above the 2-gigabyte boundary (“bar”) in virtual storage (Optional)<br />
– OLDS must be Extended Format and OLDS blocksize must be a multiple of 4096<br />
– Potentially frees substantial amount of ECSA<br />
• OLDS block size (Optional but recommended)<br />
– BLKSZ parameter on OLDSDEF statement in DFSVSMxx member<br />
– Previously, it was set only from the data set characteristics<br />
• WADS Management changed to be more efficient (next slide)<br />
42<br />
Benefits<br />
•Increased logging rates<br />
•ECSA constraint relief<br />
•Simplified definitions<br />
•Smaller WADS<br />
Logging rates over 350<br />
MB/sec were achieved using<br />
the <strong>IMS</strong> <strong>12</strong> Logger with 64-bit<br />
virtual buffering and SAM<br />
striping.<br />
© 20<strong>12</strong> IBM Corporation
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