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Oracle log file sequential read

Oracle Tips by Burleson Consulting

The log file sequential read Oracle metric indicates that the process is waiting for blocks to be read from the online redo log into memory. This primarily occurs at instance startup and when the ARCH process archives filled online redo logs.

Here are my notes on log file sequential reads:

Oracle db file sequential scattered read

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Oracle Disk Architecture

NOLOGGING, NOARCHIVELOG

v$active_session_history

The popular Ion tool is the easiest way to analyze Oracle log file sequential read behavior over time (above plot of log file parallel writes), and Ion allows you to spot hidden redo log performance trends.

This, and many other Oracle performance metrics are discussed in my book "Oracle Tuning" by Rampant TechPress. You can buy it directly from the publisher and save 30% at this link:

http://www.rampant-books.com/book_1002_oracle_tuning_definitive_reference_2nd_ed.htm

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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals. Feel free to ask questions on our Oracle forum.

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