DBA SGA Memory Allocation – Oracle EBS SQL Report
Oracle E-Business Suite SQL report from the Enginatics Library powered by Blitz Report™. Oracle EBS module: Database Administration · all Database Administration reports
Overview
Current SGA memory usage in gigabytes, showing the split between buffer cache and shared pool
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Report Parameters
None
Oracle EBS Tables Used
Report Categories
Related Reports
DBA SGA+PGA Memory Configuration, DBA Undo Statistics, DBA Resource Limits, DBA Sessions, DBA Blocking Sessions
Running This SQL Without Blitz Report
The SQL source can be run in any SQL client. Some Oracle EBS SQL reports in this library use functions from the utility package xxen_util – install it first. Blitz Report™ adds parameters, Excel output with pivots, scheduling and security on top.
Download & Import Options
| Resource | Link |
|---|---|
| Excel Example Output | DBA SGA Memory Allocation 16-Jun-2018 072434.xlsx |
| Blitz Report™ XML Import | DBA_SGA_Memory_Allocation.xml |
| SQL Source | DBA SGA Memory Allocation.sql |
| Full Report on Enginatics | www.enginatics.com/reports/dba-sga-memory-allocation/ |
Case Study & Technical Analysis
Abstract
The DBA SGA Memory Allocation report provides a high-level summary of the System Global Area (SGA) configuration. It displays the current size of major memory components such as the Buffer Cache, Shared Pool, Large Pool, and Java Pool. This report is essential for verifying memory settings, especially when using Automatic Shared Memory Management (ASMM) or Automatic Memory Management (AMM).
Technical Analysis
Core Components
- Buffer Cache: Memory for caching data blocks.
- Shared Pool: Memory for the library cache (SQL plans), dictionary cache, and PL/SQL code.
- Large Pool: Used for RMAN backups, parallel query message buffers, and UGA (in shared server mode).
- Java Pool: Memory for the JVM within the database.
- Log Buffer: Memory for redo entries.
Key View
GV$SGAINFO: Provides accurate, dynamic sizing information for SGA components, reflecting the current state after any automatic resizing operations.
Operational Use Cases
- Configuration Audit: Verifying that the
SGA_TARGETorSGA_MAX_SIZEparameters are being respected. - Tuning ASMM: Checking if Oracle is “stealing” memory from the Buffer Cache to feed a growing Shared Pool (a common symptom of literal SQL flooding).
- OOM Troubleshooting: Investigating ORA-04031 (unable to allocate bytes of shared memory) errors by seeing which component is consuming the space.
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