- SGA, PGA usage
-- pctused: usage rate
select name,total,round(total-free,2) used, round(free,2) free,round((total-free)/total*100,2) pctused from (select 'SGA' name,(select sum(value/1024/1024) from v$sga) total, (select sum(bytes/1024/1024) from v$sgastat where name='free memory')free from dual) union select name,total,round(used,2)used,round(total-used,2)free,round(used/total*100,2)pctused from ( select 'PGA' name,(select value/1024/1024 total from v$pgastat where name='aggregate PGA target parameter')total, (select value/1024/1024 used from v$pgastat where name='total PGA allocated')used from dual);
- memory usage
-- pctused: usage rate select * from ( select name,total,round(total-free,2) used, round(free,2) free,round((total-free)/total*100,2) pctused from (select 'SGA' name,(select sum(value/1024/1024) from v$sga) total, (select sum(bytes/1024/1024) from v$sgastat where name='free memory')free from dual) union select name,total,round(used,2)used,round(total-used,2)free,round(used/total*100,2)pctused from ( select 'PGA' name,(select value/1024/1024 total from v$pgastat where name='aggregate PGA target parameter')total, (select value/1024/1024 used from v$pgastat where name='total PGA allocated')used from dual) union select name,round(total,2) total,round((total-free),2) used,round(free,2) free,round((total-free)/total*100,2) pctused from ( select 'Shared pool' name,(select sum(bytes/1024/1024) from v$sgastat where pool='shared pool')total, (select bytes/1024/1024 from v$sgastat where name='free memory' and pool='shared pool') free from dual) union select name,round(total,2)total,round(total-free,2) used,round(free,2) free,round((total-free)/total,2) pctused from ( select 'Default pool' name,( select a.cnum_repl*(select value from v$parameter where name='db_block_size')/1024/1024 total from x$kcbwds a, v$buffer_pool p where a.set_id=p.LO_SETID and p.name='DEFAULT' and p.block_size=(select value from v$parameter where name='db_block_size')) total, (select a.anum_repl*(select value from v$parameter where name='db_block_size')/1024/1024 free from x$kcbwds a, v$buffer_pool p where a.set_id=p.LO_SETID and p.name='DEFAULT' and p.block_size=(select value from v$parameter where name='db_block_size')) free from dual) union select name,nvl(round(total,2),0)total,nvl(round(total-free,2),0) used,nvl(round(free,2),0) free,nvl(round((total-free)/total,2),0) pctused from ( select 'KEEP pool' name,(select a.cnum_repl*(select value from v$parameter where name='db_block_size')/1024/1024 total from x$kcbwds a, v$buffer_pool p where a.set_id=p.LO_SETID and p.name='KEEP' and p.block_size=(select value from v$parameter where name='db_block_size')) total, (select a.anum_repl*(select value from v$parameter where name='db_block_size')/1024/1024 free from x$kcbwds a, v$buffer_pool p where a.set_id=p.LO_SETID and p.name='KEEP' and p.block_size=(select value from v$parameter where name='db_block_size')) free from dual) union select name,nvl(round(total,2),0)total,nvl(round(total-free,2),0) used,nvl(round(free,2),0) free,nvl(round((total-free)/total,2),0) pctused from ( select 'RECYCLE pool' name,( select a.cnum_repl*(select value from v$parameter where name='db_block_size')/1024/1024 total from x$kcbwds a, v$buffer_pool p where a.set_id=p.LO_SETID and p.name='RECYCLE' and p.block_size=(select value from v$parameter where name='db_block_size')) total, (select a.anum_repl*(select value from v$parameter where name='db_block_size')/1024/1024 free from x$kcbwds a, v$buffer_pool p where a.set_id=p.LO_SETID and p.name='RECYCLE' and p.block_size=(select value from v$parameter where name='db_block_size')) free from dual) union select name,nvl(round(total,2),0)total,nvl(round(total-free,2),0) used,nvl(round(free,2),0) free,nvl(round((total-free)/total,2),0) pctused from( select 'DEFAULT 16K buffer cache' name,(select a.cnum_repl*16/1024 total from x$kcbwds a, v$buffer_pool p where a.set_id=p.LO_SETID and p.name='DEFAULT' and p.block_size=16384) total, (select a.anum_repl*16/1024 free from x$kcbwds a, v$buffer_pool p where a.set_id=p.LO_SETID and p.name='DEFAULT' and p.block_size=16384) free from dual) union select name,nvl(round(total,2),0)total,nvl(round(total-free,2),0) used,nvl(round(free,2),0) free,nvl(round((total-free)/total,2),0) pctused from( select 'DEFAULT 32K buffer cache' name,(select a.cnum_repl*32/1024 total from x$kcbwds a, v$buffer_pool p where a.set_id=p.LO_SETID and p.name='DEFAULT' and p.block_size=32768) total, (select a.anum_repl*32/1024 free from x$kcbwds a, v$buffer_pool p where a.set_id=p.LO_SETID and p.name='DEFAULT' and p.block_size=32768) free from dual) union select name,total,total-free used,free, (total-free)/total*100 pctused from ( select 'Java Pool' name,(select sum(bytes/1024/1024) total from v$sgastat where pool='java pool' group by pool)total, ( select bytes/1024/1024 free from v$sgastat where pool='java pool' and name='free memory')free from dual) union select name,Round(total,2),round(total-free,2) used,round(free,2) free, round((total-free)/total*100,2) pctused from ( select 'Large Pool' name,(select sum(bytes/1024/1024) total from v$sgastat where pool='large pool' group by pool)total, ( select bytes/1024/1024 free from v$sgastat where pool='large pool' and name='free memory')free from dual) order by pctused desc);
select * from v$sga_dynamic_components;
select * from v$pgastat;
-- Query the free memory of the share pool
select a.*,round(a.bytes/1024/1024,2) M from v$sgastat a where a.NAME = 'free memory';
-- Through the following sql query, the sql that occupies the share pool memory is greater than 10M
SELECT substr(sql_text,1,100) "Stmt", count(*),
sum(sharable_mem) "Mem",
sum(users_opening) "Open",
sum(executions) "Exec"
FROM v$sql
GROUP BY substr(sql_text,1,100)
HAVING sum(sharable_mem) > 10000000;
-- Query the statement with high version count
SELECT address,
sql_id,
hash_value,
version_count,
users_opening,
users_executing,
sql_text
FROM v$sqlarea WHERE version_count > 10;