DBA AWR PGA History
Description:
History of database PGA size and other statistics from v$pgastat in megabytes
Parameters
Date From, Date To, Diagnostic Pack enabled, Container Data
Used tables
dba_hist_snapshot, dba_hist_pgastat
Categories
Related reports
DBA SGA+PGA Memory Configuration
Dependencies
If you would like to try one of these Oracle EBS SQLs without having Blitz Report installed, note that some of the reports require functions from utility package xxen_util.
Example Report
DBA AWR PGA History 29-Jul-2018 094718.xlsx
Report SQL
www.enginatics.com/reports/dba-awr-pga-history/
Blitz Report™ import options
Executive Summary
The DBA AWR PGA History report tracks the usage of the Program Global Area (PGA) over time. The PGA is the memory region reserved for each server process to perform non-shared operations, primarily sorting and hashing. Unlike the SGA (which is fixed), the PGA grows and shrinks dynamically. This report helps DBAs understand if the PGA_AGGREGATE_TARGET is sized correctly.
Business Challenge
- Memory Leaks: “Why does the database server run out of RAM every Friday?”
- Performance Tuning: “Are we doing too many disk sorts because the PGA is too small?”
- Sizing: “How much memory do we need to allocate to PGA to support 500 concurrent users?”
Solution
This report displays historical PGA statistics from AWR.
Key Features:
- Total PGA Allocated: The total amount of memory currently used by all processes.
- Cache Hit %: The percentage of work areas (sorts/hashes) that ran entirely in memory (Optimal) vs. spilling to disk (One-pass/Multipass).
- Over-allocation Count: Number of times the system failed to honor the target limit.
Architecture
The report queries DBA_HIST_PGASTAT.
Key Tables:
DBA_HIST_PGASTAT: Historical PGA statistics.DBA_HIST_SNAPSHOT: Snapshot timing.
Impact
- Stability: Prevents ORA-4030 (out of process memory) errors.
- Performance: Maximizes in-memory sorting, which is orders of magnitude faster than disk sorting.
- Cost Efficiency: Ensures RAM is allocated where it’s needed most (SGA vs. PGA).
Oracle E-Business Suite Reporting Library
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