Bufwaits

Problem: Too Many Bufwaits

Excessive number of bufwaits observed in IDS 7.22. What is the cause and what do I need to correct it? Have not seen any ovbuff entries in onstat -p.

Solutions: LRUs and Read-Ahead

  • Try increasing your LRUS. Sometimes bufwaits can be caused by excessive LRU contention.

  • Excessive bufwaits can also be caused by high user activity or excessive number or discarded read-aheads. Try lowering your RA_PAGES and/or RA_THRESHOLD parameters to reduce the number of read-aheads if your onstat -p output indicates that you are experiencing lots of discarded read-ahead pages.

  • Try increasing the BUFFERS value.

  • You may be getting hit by a bug in which certain LRU settings are problematic. Try decreasing or increasing your LRU settings ...

Get Informix DBA Survival Guide, Second Edition now with the O’Reilly learning platform.

O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.