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Message type: E = Error
Message class: DB11 - Oracle Monitor: messages
Message number: 177
Message text: Wait event 'latch free latch:
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DB11177
- Wait event 'latch free latch: The SAP error message DB11177, which indicates a wait event for "latch free latch: ", typically arises in Oracle databases when a session is waiting for a latch that is currently held by another session. Latches are lightweight synchronization mechanisms used in Oracle to protect shared data structures in memory. When a session cannot acquire a latch, it will wait, leading to potential performance issues. Causes: High Contention: Multiple sessions are trying to access the same latch simultaneously, leading to contention. Inefficient Code: Poorly optimized SQL queries or PL/SQL code can lead to excessive latch contention.
Configuration Issues: Incorrect database configuration or insufficient resources can exacerbate latch contention. Heavy Load: A sudden increase in workload can lead to more sessions competing for the same latches. Bug in Oracle: Sometimes, specific versions of Oracle may have bugs that lead to latch contention. Solutions: Identify the Latch: Use Oracle's performance views (like V$LATCH, V$SESSION, and V$SESSION_WAIT) to identify which latch
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