????T.askmaclean.com???Shared Pool?SubPool?????,????????_kghdsidx_count ? subpool ??subpool????( ???duration)???:
SQL> select * from v$version;
BANNER
----------------------------------------------------------------
Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bi
PL/SQL Release 10.2.0.5.0 - Production
CORE 10.2.0.5.0 Production
TNS for Linux: Version 10.2.0.5.0 - Production
NLSRTL Version 10.2.0.5.0 - Production
SQL> set linesize 200 pagesize 1400
SQL> show parameter kgh
NAME TYPE VALUE
------------------------------------ -------------------------------- ------------------------------
_kghdsidx_count integer 7
SQL> oradebug setmypid;
Statement processed.
SQL> oradebug dump heapdump 536870914;
Statement processed.
SQL> oradebug tracefile_name
/s01/admin/G10R25/udump/g10r25_ora_11783.trc
[oracle@vrh8 dbs]$ grep "sga heap" /s01/admin/G10R25/udump/g10r25_ora_11783.trc
HEAP DUMP heap name="sga heap" desc=0x60000058
HEAP DUMP heap name="sga heap(1,0)" desc=0x60036110
FIVE LARGEST SUB HEAPS for heap name="sga heap(1,0)" desc=0x60036110
HEAP DUMP heap name="sga heap(2,0)" desc=0x6003f938
FIVE LARGEST SUB HEAPS for heap name="sga heap(2,0)" desc=0x6003f938
HEAP DUMP heap name="sga heap(3,0)" desc=0x60049160
FIVE LARGEST SUB HEAPS for heap name="sga heap(3,0)" desc=0x60049160
HEAP DUMP heap name="sga heap(4,0)" desc=0x60052988
FIVE LARGEST SUB HEAPS for heap name="sga heap(4,0)" desc=0x60052988
HEAP DUMP heap name="sga heap(5,0)" desc=0x6005c1b0
FIVE LARGEST SUB HEAPS for heap name="sga heap(5,0)" desc=0x6005c1b0
HEAP DUMP heap name="sga heap(6,0)" desc=0x600659d8
FIVE LARGEST SUB HEAPS for heap name="sga heap(6,0)" desc=0x600659d8
HEAP DUMP heap name="sga heap(7,0)" desc=0x6006f200
FIVE LARGEST SUB HEAPS for heap name="sga heap(7,0)" desc=0x6006f200
SQL> alter system set "_kghdsidx_count"=6 scope=spfile;
System altered.
SQL> startup force;
ORACLE instance started.
Total System Global Area 859832320 bytes
Fixed Size 2100104 bytes
Variable Size 746587256 bytes
Database Buffers 104857600 bytes
Redo Buffers 6287360 bytes
Database mounted.
Database opened.
SQL>
SQL> oradebug setmypid;
Statement processed.
SQL> oradebug dump heapdump 536870914;
Statement processed.
SQL> oradebug tracefile_name
/s01/admin/G10R25/udump/g10r25_ora_11908.trc
[oracle@vrh8 dbs]$ grep "sga heap" /s01/admin/G10R25/udump/g10r25_ora_11908.trc
HEAP DUMP heap name="sga heap" desc=0x60000058
HEAP DUMP heap name="sga heap(1,0)" desc=0x600360f0
FIVE LARGEST SUB HEAPS for heap name="sga heap(1,0)" desc=0x600360f0
HEAP DUMP heap name="sga heap(2,0)" desc=0x6003f918
FIVE LARGEST SUB HEAPS for heap name="sga heap(2,0)" desc=0x6003f918
HEAP DUMP heap name="sga heap(3,0)" desc=0x60049140
FIVE LARGEST SUB HEAPS for heap name="sga heap(3,0)" desc=0x60049140
HEAP DUMP heap name="sga heap(4,0)" desc=0x60052968
FIVE LARGEST SUB HEAPS for heap name="sga heap(4,0)" desc=0x60052968
HEAP DUMP heap name="sga heap(5,0)" desc=0x6005c190
FIVE LARGEST SUB HEAPS for heap name="sga heap(5,0)" desc=0x6005c190
HEAP DUMP heap name="sga heap(6,0)" desc=0x600659b8
FIVE LARGEST SUB HEAPS for heap name="sga heap(6,0)" desc=0x600659b8
SQL>
SQL> alter system set "_kghdsidx_count"=2 scope=spfile;
System altered.
SQL>
SQL> startup force;
ORACLE instance started.
Total System Global Area 851443712 bytes
Fixed Size 2100040 bytes
Variable Size 738198712 bytes
Database Buffers 104857600 bytes
Redo Buffers 6287360 bytes
Database mounted.
Database opened.
SQL> oradebug setmypid;
Statement processed.
SQL> oradebug dump heapdump 2;
Statement processed.
SQL> oradebug tracefile_name
/s01/admin/G10R25/udump/g10r25_ora_12003.trc
[oracle@vrh8 ~]$ grep "sga heap" /s01/admin/G10R25/udump/g10r25_ora_12003.trc
HEAP DUMP heap name="sga heap" desc=0x60000058
HEAP DUMP heap name="sga heap(1,0)" desc=0x600360b0
HEAP DUMP heap name="sga heap(2,0)" desc=0x6003f8d
SQL> alter system set cpu_count=16 scope=spfile;
System altered.
SQL> startup force;
ORACLE instance started.
Total System Global Area 851443712 bytes
Fixed Size 2100040 bytes
Variable Size 738198712 bytes
Database Buffers 104857600 bytes
Redo Buffers 6287360 bytes
Database mounted.
Database opened.
SQL> oradebug setmypid;
Statement processed.
SQL> oradebug dump heapdump 2;
Statement processed.
SQL> oradebug tracefile_name
/s01/admin/G10R25/udump/g10r25_ora_12065.trc
[oracle@vrh8 ~]$ grep "sga heap" /s01/admin/G10R25/udump/g10r25_ora_12065.trc
HEAP DUMP heap name="sga heap" desc=0x60000058
HEAP DUMP heap name="sga heap(1,0)" desc=0x600360b0
HEAP DUMP heap name="sga heap(2,0)" desc=0x6003f8d8
SQL> show parameter sga_target
NAME TYPE VALUE
------------------------------------ -------------------------------- ------------------------------
sga_target big integer 0
SQL> alter system set sga_target=1000M scope=spfile;
System altered.
SQL> startup force;
ORACLE instance started.
Total System Global Area 1048576000 bytes
Fixed Size 2101544 bytes
Variable Size 738201304 bytes
Database Buffers 301989888 bytes
Redo Buffers 6283264 bytes
Database mounted.
Database opened.
SQL> alter system set sga_target=1000M scope=spfile;
System altered.
SQL> startup force;
ORACLE instance started.
Total System Global Area 1048576000 bytes
Fixed Size 2101544 bytes
Variable Size 738201304 bytes
Database Buffers 301989888 bytes
Redo Buffers 6283264 bytes
Database mounted.
Database opened.
SQL>
SQL>
SQL> oradebug setmypid;
Statement processed.
SQL> oradebug dump heapdump 2;
Statement processed.
SQL> oradebug tracefile_name
/s01/admin/G10R25/udump/g10r25_ora_12148.trc
SQL>
SQL> Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
[oracle@vrh8 dbs]$ grep "sga heap" /s01/admin/G10R25/udump/g10r25_ora_12148.trc
HEAP DUMP heap name="sga heap" desc=0x60000058
HEAP DUMP heap name="sga heap(1,0)" desc=0x60036690
HEAP DUMP heap name="sga heap(1,1)" desc=0x60037ee8
HEAP DUMP heap name="sga heap(1,2)" desc=0x60039740
HEAP DUMP heap name="sga heap(1,3)" desc=0x6003af98
HEAP DUMP heap name="sga heap(2,0)" desc=0x6003feb8
HEAP DUMP heap name="sga heap(2,1)" desc=0x60041710
HEAP DUMP heap name="sga heap(2,2)" desc=0x60042f68
_enable_shared_pool_durations:?????????10g????shared pool duration??,?????sga_target?0?????false;
???10.2.0.5??cursor_space_for_time???true??????false,???10.2.0.5??cursor_space_for_time?????
SQL> alter system set "_enable_shared_pool_durations"=false scope=spfile;
System altered.
SQL>
SQL> startup force;
ORACLE instance started.
Total System Global Area 1048576000 bytes
Fixed Size 2101544 bytes
Variable Size 738201304 bytes
Database Buffers 301989888 bytes
Redo Buffers 6283264 bytes
Database mounted.
Database opened.
SQL> oradebug setmypid;
Statement processed.
SQL> oradebug dump heapdump 2;
Statement processed.
SQL> oradebug tracefile_name
/s01/admin/G10R25/udump/g10r25_ora_12233.trc
SQL>
SQL> Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options\
[oracle@vrh8 dbs]$ grep "sga heap" /s01/admin/G10R25/udump/g10r25_ora_12233.trc
HEAP DUMP heap name="sga heap" desc=0x60000058
HEAP DUMP heap name="sga heap(1,0)" desc=0x60036690
HEAP DUMP heap name="sga heap(2,0)" desc=0x6003feb8
??:1._kghdsidx_count ??? shared pool subpool???, _kghdsidx_count???????7 ??? 7? shared pool subpool
2.??????? subpool???4? sub partition ?:
sga heap(1,0) sga heap(1,1) sga heap(1,2) sga heap(1,3)
????? cpu??? ?????_kghdsidx_count, ???? ?10g ?AUTO SGA ??? shared pool duration???,
duration ??4?:
Session duration
Instance duration (never freed)
Execution duration (freed fastest)
Free memory
??? shared pool duration????
?10gR1?Shared Pool?shrink??????????,?????????????Buffer Cache???????????granule,????Buffer Cache?granule????granule header?Metadata(???buffer header??RAC??Lock Elements)????,?????????????????????shared pool????????duration(?????)?chunk??????granule?,????????????granule??10gR2????Buffer Cache Granule????????granule header?buffer?Metadata(buffer header?LE)????,??shared pool???duration?chunk????????granule,??????buffer cache?shared pool??????????????10gr2?streams pool?????????(???????streams pool duration????)
reference : http://www.oracledatabase12g.com/archives/understanding-automatic-sga-memory-management.html
