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Don Burleson Blog 







Types of Latches Within Oracle

Expert Oracle Database Tips by Donald BurlesonMarch 22, 2015

Shared Pool Latches

Shared pool latches provide the essential function of protecting crucial operations within the memory management tasks of allocating and freeing up memory resources within the shared pool region of the Oracle SGA. As most senior DBAs are aware of with respect to performance tuning of Oracle database environments, SQL statements that rely on literal expressions can peg memory in the shared pool, thereby adversely affecting performance of the Oracle database.

Excessive shared pool latches can limit database throughput and the ability to scale out for critical applications and, as such, literal SQL statements can be quite expensive. For more details on reducing shared pool latching, see my notes on cursor_sharing. 

Before Oracle 9i, there was just a single shared pool latch provided by the instance to manage these operations. With 9i and later releases of Oracle, multiple child latches were introduced to manage shared pool activities to reduce latch contention problems.

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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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