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Is RHEL kbbuffers near 0 a concern on an Oracle database server

in Database Tuning (MOSC) 4 commentsAnswered

We are analyzing a performance problem using Oracle 19c on RHEL 9.4. Some have noticed and are concerned that "sar -r" shows kbbuffers near zero. Since Oracle manages its own memory in the SGA, I'm wondering if kbbuffers is significant for Oracle performance. This server hosts one database.

We know we had an out-of-memory condition but it looked to me like the three app servers got into a race condition opening connections as fast as possible - almost like a DDoS attack. Using the listener.log, I saw large spikes in connections per minute near the time of the problem. Many connections failed after the database exceeded max connections. Neither the OS nor DB crashed but were unresponsive at times.

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