لتحليل System Global Area ومعرفة المساحات بها

متابعين

بتاريخ: 15 نوفمبر 200421 سنة

أذا اردت معرفة بيا نات عن System Global Area SGA فى قا عدة البيانات التى تعمل عليها

set echo off
set feedback off
set linesize 512

prompt
prompt SGA Memory Map (overall)
prompt

column dummy      noprint
column area       format a20 heading 'Main SGA Areas'
column name       format a20
column pool       format a20
column bytes      format 999,999,999,999
column sum(bytes) format 999,999,999,999

break on report
compute sum of sum(bytes) on report

SELECT 1 dummy, 'DB Buffer Cache' area, name, sum(bytes)
FROM v$sgastat WHERE pool is null and name = 'db_block_buffers'
group by name
union all
SELECT 2, 'Shared Pool', pool, sum(bytes) 
FROM v$sgastat WHERE pool = 'shared pool'
group by pool
union all
SELECT 3, 'Large Pool', pool, sum(bytes) 
FROM v$sgastat WHERE pool = 'large pool'
group by pool
union all
SELECT 4, 'Java Pool', pool, sum(bytes) 
FROM v$sgastat WHERE pool = 'java pool'
group by pool
union all
SELECT 5, 'Redo Log Buffer', name, sum(bytes)
FROM v$sgastat WHERE pool is null and name = 'log_buffer'
group by name
union all
SELECT 6, 'Fixed SGA', name, sum(bytes)
FROM v$sgastat WHERE pool is null and name = 'fixed_sga'
group by name
ORDER BY 4 desc;

column area       format a20 heading 'Shared Pool Areas'

prompt
prompt SGA Memory Map (shared pool)
prompt

SELECT 'Shared Pool' area, name, sum(bytes) 
FROM v$sgastat WHERE pool = 'shared pool' and name in ('library cache','dictionary cache','free memory','sql area')
group by name
union all
SELECT 'Shared Pool' area, 'miscellaneous', sum(bytes) 
FROM v$sgastat WHERE pool = 'shared pool' and name not in ('library cache','dictionary cache','free memory','sql area')
group by pool
order by 3 desc;

اقتباس