log writer latency

if lgwr latency is more important than throughput then as of 11.2.0.4(and 3) consider the following:

– apparently log_buffer size governs group commit batch size. A bigger log buffer means bigger write batch size which means longer session waits on commit. See lgwr warnings of over 500ms log writes under heavier throughput: the bigger log buffer size – the bigger warning size is reported

– 11g lgwr polling might increase log file sync wait. Use parameter _use_adaptive_log_file_sync to disable polling

– Consider binding processes lgwr and nssN (this is a data guard process) to dedicated cpu’s

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