SGA
SQL> show parameter sga_target
NAME TYPE VALUE
------------------------------------ --------------------------------- ------------------------------
sga_target big integer 2G
SQL> show parameter sga_max_size
NAME TYPE VALUE
------------------------------------ --------------------------------- ------------------------------
sga_max_size big integer 2G
SQL> select name,value/1024/1024 as "SIZE (MB)" from v$sga;
NAME SIZE (MB)
------------------------------ ----------
Fixed Size 2.11244965
Variable Size 320.000832
Database Buffers 1712
Redo Buffers 4.734375
DB BUFFER CACHE
SQL> show parameter db_block_size
NAME TYPE VALUE
------------------------------------ --------------------------------- ------------------------------
db_block_size integer 8192
SQL> select * from v$sgainfo where name='Granule Size';
NAME BYTES RESIZEABL
------------------------------ ---------- ---------
Granule Size 16777216 No
SQL> select 16777216/8192 from dual; -- granule中包含2048个buffer
16777216/8192
-------------
2048
SQL> select * from v$sgainfo where name='Buffer Cache Size';
NAME BYTES RESIZEABL
------------------------------ ---------- ---------
Buffer Cache Size 1795162112 Yes
SQL> select 1795162112/1024/1024 from dual;
1795162112/1024/1024
--------------------
1712
SQL> select 1795162112/8192 from dual; --db_cache中包含219136个buffer
1795162112/8192
---------------
219136
SQL> select 219136/2048 from dual; --db_cache由107个granule组成
219136/2048
-----------
107
SHARED POOL
SQL> select * from v$sgainfo where name='Shared Pool Size';
NAME BYTES RESIZEABL
------------------------------ ---------- ---------
Shared Pool Size 285212672 Yes
SQL> select 285212672/1024/1024 from dual;
285212672/1024/1024
-------------------
272
SQL> column indx heading "indx | indx num"
SQL> column kghlurcr heading "recurrent|chunks"
SQL> column kghlutrn heading "transient|chunks"
SQL> column kghlufsh heading "flushed|chunks"
SQL> column kghluops heading "pins and|releases"
SQL> column kghlunfu heading "ora-4031|errors"
SQL> column kghlunfs heading "last error|size"
SQL> select indx,kghlurcr,kghlutrn,kghlufsh,kghluops,kghlunfu,kghlunfs from x$kghlu where inst_id=userenv('Instance');
indx recurrent transient flushed pins and ora-4031 last error
indx num chunks chunks chunks releases errors size
---------- ---------- ---------- ---------- ---------- ---------- ----------
0 3541 8077 0 22813 0 0
SQL> show parameter shared_pool_reserved_size
NAME TYPE VALUE
------------------------------------ --------------------------------- ------------------------------
shared_pool_reserved_size big integer 14260633
SQL> col ksppinm for a35
SQL> col ksppstvl for a20
SQL> col ksppdesc for a80
SQL> select ksppinm,ksppstvl,ksppdesc from x$ksppi x,x$ksppcv y where x.indx = y.indx and ksppinm = '_shared_pool_reserved_min_alloc';
KSPPINM KSPPSTVL KSPPDESC
----------------------------------- -------------------- --------------------------------------------------------------------------------
_shared_pool_reserved_min_alloc 4400 minimum allocation size in bytes for reserved area of shared pool
SQL> select free_space,avg_free_size,used_space,request_failures,last_failure_size from v$shared_pool_reserved;
FREE_SPACE AVG_FREE_SIZE USED_SPACE REQUEST_FAILURES LAST_FAILURE_SIZE
---------- ------------- ---------- ---------------- -----------------
10146416 724744 16704568 0 0
SQL> col ksppinm for a35
SQL> col ksppstvl for a20
SQL> col ksppdesc for a50
SQL> select ksppinm,ksppstvl,ksppdesc from x$ksppi x,x$ksppcv y where x.indx = y.indx and ksppinm = '_kghdsidx_count';
KSPPINM KSPPSTVL KSPPDESC
----------------------------------- -------------------- --------------------------------------------------
_kghdsidx_count 1 max kghdsidx count
SQL> select 'shared pool('||nvl (decode (to_char(ksmdsidx),'0','0-Unused',ksmdsidx),'Total')||'):'subpool,round(sum(ksmsslen)/1048576,2) "SIZE(MB)"
2 from x$ksmss where ksmsslen > 0
3 group by rollup(ksmdsidx) order by subpool asc;
SUBPOOL SIZE(MB)
------------------------------ ----------
shared pool(0-Unused): 64
shared pool(1): 208
shared pool(Total): 272
SQL> select subpool,name,round(sum(bytes)/1048576,2) "FREE SIZE(MB)"
from (select 'shared pool (' || decode (to_char (ksmdsidx),'0','0-Unused',ksmdsidx) || '):' subpool,ksmssnam name,
ksmsslen bytes from x$ksmss where ksmsslen>0 and lower(ksmssnam) like lower ('%free memory%'))
group by subpool,name order by subpool asc,sum(bytes) desc;
SUBPOOL NAME FREE SIZE(MB)
------------------------------ ------------------------------ -------------
shared pool (0-Unused): free memory 64
shared pool (1): free memory 48.41
原文地址：http://blog.51cto.com/13598811/2135909