I have heard that UNIX I/O buffer sometimes causes problems during system crash because it keeps files which, application thinks, are already written to disk. And then this changes go lost during crash. Therefore I heard a recommendation, that dba's should disabled UNIX file buffering on mountpoints where rdbms are running.
What about this? Any hints? What about PostgreSQL? Do we bypass this OS buffering (fsync?) or should a dba do anything else?
How do I disable this I/O buffering?
Thanks for comments Oli
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Oli Sennhauser Database-Engineer (Oracle & PostgreSQL) Rebenweg 6 CH - 8610 Uster / Switzerland
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