How much memory is been utilized
by the SGA
We are running SAP 4.6c with
ORACLE 9.2.0.5 on AIX. Database is configured with Dynamic SGA, and we
have set SGA_MAX_SIZE also.
v$sga will give you the current sga stats Run statspack to analyze whether you reqiure more sga or not You can also look at V$SGASTAT view. Try running the following script (note the part about free memory): CODE set verify off set pagesize 23 set linesize 80 set pause on set pause 'Hit enter to continue' set feedback off set showmode off set echo off col num format 999 heading "Nbr" col name format a20 heading "Name" col type format 999 heading "Type" col value format a10 heading "Value" col meg format 99.99 heading "Size|Meg" col isdefault format a10 heading "IsDefault" TTITLE "SHARED POOL PARAMETERS (DICTIONARY AND LIBRARY CACHE)" select num, name, type, value, (to_number(value) / 1024) / 1024 meg, isdefault from v$parameter where name = 'shared_pool_size'; col AA format 99.99 heading "Size MB" col BB format 99.99 heading "Free MB" col CC format 99.99 heading "% Free" col DD format 99999999 heading "Executions" col EE format 999999 heading "Reloads" col FF format 999.99 heading "% Reload" col GG format a20 heading "Parameter" col HH format 99,999,999 heading "Count|(entries)" col II format 99,999,999 heading "Usage|(valid entries)" col JJ format 99,999,999 heading "Gets|(memory)" col KK format 9,999,999 heading "Misses|(disk)" col LL format 99.99 heading "% Misses" TTITLE CENTER 'V$PARAMETER (SHARED POOL SIZE) AND V$SGASTAT (FREE MEMORY) REPORT ' select (to_number(VP.value) / 1024) / 1024 AA, VS.bytes / 1048576 BB, (VS.bytes / to_number(VP.value)) * 100 CC from v$parameter VP, v$sgastat VS where VS.name = 'free memory' and VP.name = 'shared_pool_size'; PROMPT PROMPT More than 5% Free = lower shared_pool_buffer parameter TTITLE CENTER 'V$LIBRARYCACHE (SHARED SQL AREA) SUMMARY REPORT' STITLE CENTER 'V$LIBRARYCACHE (SHARED SQL AREA) SUMMARY REPORT' select sum(VL.pins) DD, sum(VL.reloads) EE, (sum(VL.reloads) / sum(VL.pins)) * 100 FF from v$librarycache VL; PROMPT PROMPT More than 1% Reloads = raise shared_pool_size parameter TTITLE CENTER 'V$ROWCACHE ENTRIES DETAIL REPORT (DICTIONARY)' select parameter GG, /* count HH, */ /* usage II, */ gets JJ, getmisses KK, (getmisses / (gets + getmisses + 1)) * 100 LL from v$rowcache order by parameter; PROMPT PROMPT Not tunable at this level of detail, provided for information only. TTITLE CENTER 'V$ROWCACHE ENTRIES SUMMARY REPORT (DICTIONARY)' select sum(gets) JJ, sum(getmisses) KK, (sum(getmisses) / (sum(gets) + sum(getmisses) + 1)) * 100 LL from v$rowcache; PROMPT PROMPT Not tunable at this level of detail, provided for information only. TTITLE CENTER 'V$ROWCACHE ENTRIES SUMMARY REPORT (DICTIONARY)' select sum(gets) JJ, sum(getmisses) KK, (sum(getmisses) / (sum(gets) + sum(getmisses) + 1)) * 100 LL from v$rowcache; PROMPT PROMPT More than 5% Misses (summary) = raise shared_pool_buffer parameter exit; Have a Oracle Question
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