SQL> 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); 2 3 4 5 6 7
NAM TOTAL USED FREE PCTUSED
--- ---------- ---------- ---------- ----------
PGA 377 327.12 49.88 86.77
SGA 1135.99883 1067.11 68.89 93.94
查看内存大小
SQL> 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)/totaSQL> l*100 pctused from ( s 2 elect 'Java Pool 3 ' name,(select sum(bytes/1024/1024) total from v$sgastat where pool='java pool' group by pool)total, ( select 4 bytes/1024/1024 free from v$sgastat where pool='java pool' and nam 5 e='free memory')free from dual) union select name,Round(total,2),round(total-free,2) 6 used,r 7 ound(free,2) free, round((total-free)/total*100,2) pctused from ( select 'Large Pool' name,(select 8 sum(bytes/1024/1024) total from v$sgastat where pool='large pool' group by pool)total, ( select bytes/1024/1024 f 9 ree from v$sgastat where pool='large pool' and name='free memory')free from dual) order by pc 10 tused de 11 sc); 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 NAME TOTAL USED FREE PCTUSED ------------------------ ---------- ---------- ---------- ---------- SGA 1135.99883 1068.71 67.29 94.08 Shared pool 272 252.24 19.76 92.74 PGA 377 327.56 49.44 86.89 Large Pool 32 .47 31.53 1.46 Default pool 351.83 101.76 250.07 .29 DEFAULT 16K buffer cache 0 0 0 0 DEFAULT 32K buffer cache 0 0 0 0 Java Pool 16 0 16 0 KEEP pool 0 0 0 0 RECYCLE pool 0 0 0 0 10 rows selected.
内存使用率
SQL> select pool,name,round(bytes/1024/1024,2) M from v$sgastat where name='free memory' 2 ; POOL NAME M -------------- -------------------------- ---------- shared pool free memory 19.67 large pool free memory 31.53 java pool free memory 16
查询share pool的空闲内存SQL> SELECT substr(sql_text,1,100) "Stmt", count(*),
sum(sharable_mem) "Mem",
sum(users_opening) "Open",
sum(executions) "Exec"
FROM v$sql
GROUP BY substr(sql_text,1,100)
HAVING sum(sharable_mem) > 1000000
2 3 4 5 6 7 8 ;
Stmt
--------------------------------------------------------------------------------
COUNT(*) Mem Open Exec
---------- ---------- ---------- ----------
select * from ( select name,total,round(total-free,2) used, round(free,2) free,r
ound((total-free)/to
1 1022017 1 3
通过下面的sql查询占用share pool内存大于1M的sqlSQL> SELECT address,
sql_id,
hash_value,
version_count,
users_opening,
users_executing,
sql_text
FROM v$sqlarea WHERE version_count > 4 2 3 4 5 6 7 8
9 ;
ADDRESS SQL_ID HASH_VALUE VERSION_COUNT USERS_OPENING
---------------- ------------- ---------- ------------- -------------
USERS_EXECUTING
---------------
SQL_TEXT
--------------------------------------------------------------------------------
0000000080BC8998 5rurx5xtjwcu2 1931359042 5 0
0
SELECT /*+ OPT_PARAM('_parallel_syspls_obey_force' 'false') */ KSPPCV.KSPPSTVL F
ROM X$KSPPCV KSPPCV, X$KSPPI KSPPI WHERE KSPPI.INDX = KSPPCV.INDX AND KSPPI.KSPP
INM = :B1
0000000080BDB368 b9nbhsbx8tqz5 4203535333 5 0
ADDRESS SQL_ID HASH_VALUE VERSION_COUNT USERS_OPENING
---------------- ------------- ---------- ------------- -------------
USERS_EXECUTING
---------------
SQL_TEXT
--------------------------------------------------------------------------------
0
SELECT /*+ OPT_PARAM('_parallel_syspls_obey_force' 'false') */ SPARE4 FROM SYS.O
PTSTAT_HIST_CONTROL$ WHERE SNAME = :B1
查询一下version count过高的语句
https://blog.csdn.net/lebron3v/article/details/79622924