Oracle Performance Memory

Flush the Shared Pool and Buffer Cache with ALTER SYSTEM Purpose Where DBMS_SHARED_POOL.PURGE removes one cursor or one package from the library cache, ALTER SYSTEM FLUSH SHARED_POOL clears every parsed statement, stored procedure, function, package, and trigger cached in the shared pool at once — a blunt instrument …

Monitor PGA Aggregate Target with V$PGASTAT in Oracle Purpose Is PGA_AGGREGATE_TARGET set high enough for the work the instance actually does? V$PGASTAT answers that question. It is the instance-level statistics view for the Program Global Area (PGA), the private memory that server processes use for work areas. Oracle …

How to Monitor Oracle Shared Pool Usage with V$SGASTAT Database Administrators (DBAs) frequently need to track memory allocation inside Oracle’s SGA (System Global Area), especially within the Shared Pool. Monitoring the shared pool helps identify memory fragmentation, excessive parsing, and potential memory-related …

Monitoring PGA Usage by Username in Oracle Database Purpose V$SESSTAT is the view that holds one statistic value per session, and two of its statistics describe how much Program Global Area (PGA) memory a session uses right now and the most it has used. The script below joins V$SESSTAT to V$STATNAME, filters the …

Oracle Database SGA Breakdown Script for Performance Monitoring Monitoring memory usage in an Oracle Database is one of the most important tasks for a DBA. The System Global Area (SGA) plays a crucial role in the performance of the database, as it stores data and control information used by Oracle processes. In this …