自动SGA管理下如何调整和查看SGA各组件大小|Oracle Oracle优化 Oracle内存 Oracle笔记 TTTBLOG

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SQL> show sga

Total System Global Area 268435456 bytes 
Fixed Size 1248476 bytes 
Variable Size 117441316 bytes 
Database Buffers 146800640 bytes 
Redo Buffers 2945024 bytes 
SQL> show parameter shared_pool

NAME TYPE VALUE 
------------------------------------ ----------- ------------------------------ 
shared_pool_reserved_size big integer 5M 
shared_pool_size big integer 64M 
SQL> show parameter cache_size

NAME TYPE VALUE 
------------------------------------ ----------- ------------------------------ 
db_16k_cache_size big integer 4M 
db_2k_cache_size big integer 0 
db_32k_cache_size big integer 0 
db_4k_cache_size big integer 8M 
db_8k_cache_size big integer 0 
db_cache_size big integer 52M 
db_keep_cache_size big integer 8M 
db_recycle_cache_size big integer 12M 
SQL> select * from v$sgainfo;

NAME BYTES RES 
------------------------------ ---------- --- 
Fixed SGA Size 1248476 No 
Redo Buffers 2945024 No 
Buffer Cache Size 146800640 Yes 
Shared Pool Size 104857600 Yes 
Large Pool Size 8388608 Yes 
Java Pool Size 4194304 Yes 
Streams Pool Size 0 Yes 
Granule Size 4194304 No 
Maximum SGA Size 268435456 No 
Startup overhead in Shared Poo 37748736 No 
l 

NAME BYTES RES 
------------------------------ ---------- --- 
                                                                                                                        
Free SGA Memory Available 0 

已选择11行。

SQL> @c:getp.sql
输入 par 的值: shared_pool
原值 6: and x.ksppinm like '%&par%'
新值 6: and x.ksppinm like '%shared_pool%'

NAME VALUE DESCRIB 
------------------------- --------------- ---------------------------------------- 
__shared_pool_size 104857600 Actual size in bytes of shared pool 
shared_pool_size 67108864 size in bytes of shared pool 
shared_pool_reserved_size 5242880 size in bytes of reserved area of shared 
                                           pool 
                                                                                                    
_shared_pool_reserved_pct 5 percentage memory of the shared pool all 
                                          ocated for the reserved area 
                                                                                                    
_shared_pool_reserved_min 4400 minimum allocation size in bytes for res 
_alloc erved area of shared pool 
                                                                                                    
_io_shared_pool_size 4194304 Size of I/O buffer pool from SGA 
_shared_pool_max_size 0 shared pool maximum size when auto SGA e 
                                          nabled 
                                                                                                    
_dm_max_shared_pool_pct 1 max percentage of the shared pool to use 
                                           for a mining model 
                                                                                                    

已选择8行。

SQL> @c:getp.sql
输入 par 的值: db_cache_size
原值 6: and x.ksppinm like '%&par%'
新值 6: and x.ksppinm like '%db_cache_size%'

NAME VALUE DESCRIB 
------------------------- --------------- ---------------------------------------- 
__db_cache_size 113246208 Actual size of DEFAULT buffer pool for s 
                                          tandard block size buffers 
                                                                                                    
db_cache_size 54525952 Size of DEFAULT buffer pool for standard 
                                           block size buffers 
                                                                                                    

SQL> host echo ==============This is the value of start=============

SQL> alter system set shared_pool_size=56M;

系统已更改。

SQL> alter system set db_cache_size=36M;

系统已更改。

SQL> host echo =================check cache change===============

SQL> show sga

Total System Global Area 268435456 bytes 
Fixed Size 1248476 bytes 
Variable Size 117441316 bytes 
Database Buffers 146800640 bytes 
Redo Buffers 2945024 bytes 
                                            
SQL> show parameter shared_pool

NAME TYPE VALUE 
------------------------------------ ----------- ------------------------------ 
shared_pool_reserved_size big integer 5M 
shared_pool_size big integer 56M 

SQL> show parameter cache_size

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
db_16k_cache_size big integer 4M
db_2k_cache_size big integer 0
db_32k_cache_size big integer 0
db_4k_cache_size big integer 8M
db_8k_cache_size big integer 0
db_cache_size big integer 36M
db_keep_cache_size big integer 8M
db_recycle_cache_size big integer 12M
SQL>
                                            
SQL> select * from v$sgainfo;

NAME BYTES RES 
------------------------- ---------- --- 
Fixed SGA Size 1248476 No 
Redo Buffers 2945024 No 
Buffer Cache Size 146800640 Yes 
Shared Pool Size 104857600 Yes 
Large Pool Size 8388608 Yes 
Java Pool Size 4194304 Yes 
Streams Pool Size 0 Yes 
Granule Size 4194304 No 
Maximum SGA Size 268435456 No 
Startup overhead in Share 37748736 No 
d Pool 
                                                                                                    
Free SGA Memory Available 0 

已选择11行。

SQL> @c:getp.sql
输入 par 的值: shared_pool
原值 6: and x.ksppinm like '%&par%'
新值 6: and x.ksppinm like '%shared_pool%'

NAME VALUE DESCRIB 
------------------------- --------------- ---