Oracle如何调整SGA的大小
2011-12-19 18:48
656 查看
Oracle 10G开始支持使用SGA_TARGET参数进行SGA自动管理,Oracle可自动调节共享池和数据缓冲池的大小,以下是OS:RH AS4 U7 64bit环境 Oracle 10.2.0.1版本的一个测试,先查看现在已有的SGA设置:
SQL> show parameter sga;
NAME TYPE VALUE
----------- ------------------------------
lock_sga boolean FALSE
pre_page_sga boolean FALSE
sga_max_size big integer 2G
sga_target big integer 2G
更改SGA大小:
SQL> alter system set sga_max_size=4096M scope=spfile;
System altered.
SQL> alter system set sga_target=4096M scope=spfile;
System altered.
如果是RAC环境,需要这样增加sid='*':
alter system set sga_target=20G scope=spfile sid='*';
重启使更改生效:
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started.
Total System Global Area 4294967296 bytes
Fixed Size 2026296 bytes
Variable Size 805307592 bytes
Database Buffers 3472883712 bytes
Redo Buffers 14749696 bytes
Database mounted.
Database opened.
SQL> show parameter sga;
NAME TYPE VALUE
----------- ------------------------------
lock_sga boolean FALSE
pre_page_sga boolean FALSE
sga_max_size big integer 4G
sga_target big integer 4G
如果更改spfile导致数据库无法启动,可以在pfile后填加附加参数,现在一般的pfile都是一行SPFILE='spfileSID.ora',在后边加参数会覆盖spfile的已有参数:
SQL> alter system set lock_sga=true scope=spfile;
System altered.
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup
ORA-27102: out of memory
Linux-x86_64 Error: 12: Cannot allocate memory
[oracle@erpdevdb dbs]$ vi initerpstudydb.ora
SPFILE='+DGSTUDY/erpstudydb/spfileerpstudydb.ora'
lock_sga=false
SQL> startup
ORACLE instance started.
启动后,可以重新设置scope=spfile的参数,再删除pfile里后加的信息即可。
From:http://www.banping.com/2009/05/06/oracle_change_sga/
SQL> show parameter sga;
NAME TYPE VALUE
----------- ------------------------------
lock_sga boolean FALSE
pre_page_sga boolean FALSE
sga_max_size big integer 2G
sga_target big integer 2G
更改SGA大小:
SQL> alter system set sga_max_size=4096M scope=spfile;
System altered.
SQL> alter system set sga_target=4096M scope=spfile;
System altered.
如果是RAC环境,需要这样增加sid='*':
alter system set sga_target=20G scope=spfile sid='*';
重启使更改生效:
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started.
Total System Global Area 4294967296 bytes
Fixed Size 2026296 bytes
Variable Size 805307592 bytes
Database Buffers 3472883712 bytes
Redo Buffers 14749696 bytes
Database mounted.
Database opened.
SQL> show parameter sga;
NAME TYPE VALUE
----------- ------------------------------
lock_sga boolean FALSE
pre_page_sga boolean FALSE
sga_max_size big integer 4G
sga_target big integer 4G
如果更改spfile导致数据库无法启动,可以在pfile后填加附加参数,现在一般的pfile都是一行SPFILE='spfileSID.ora',在后边加参数会覆盖spfile的已有参数:
SQL> alter system set lock_sga=true scope=spfile;
System altered.
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup
ORA-27102: out of memory
Linux-x86_64 Error: 12: Cannot allocate memory
[oracle@erpdevdb dbs]$ vi initerpstudydb.ora
SPFILE='+DGSTUDY/erpstudydb/spfileerpstudydb.ora'
lock_sga=false
SQL> startup
ORACLE instance started.
启动后,可以重新设置scope=spfile的参数,再删除pfile里后加的信息即可。
From:http://www.banping.com/2009/05/06/oracle_change_sga/
相关文章推荐
- Oracle如何调整SGA和PGA的大小
- 如何查看oracle SGA各组件大小,以及调整db_cache,shared_pool,PGA大小
- Oracle如何调整SGA的大小
- Oracle如何调整SGA的大小
- Oracle如何调整SGA的大小
- Oracle 调整SGA、PGA大小
- 如何在RAC下调整SGA大小 [待验证]
- Oracle调整SGA大小
- Oracle 10g 如何调整 sga_max_size 与 sga_target
- oracle 10g的SGA大小调整问题
- Oracle 调整SGA、PGA大小
- ORACLE 10g RAC SGA自动管理模式下如何固定db buffer cache和shared pool的大小
- 调整oracle sga的大小导致 ORA-00851和ORA-00844错误
- Oracle调整SGA大小
- Oracle 调整SGA、PGA大小
- Oracle 调整SGA、PGA大小
- 深入讲解调整Oracle SGA大小的解决方法
- Oracle 10g 如何调整 sga_max_size 与 sga_target
- Oracle 调整SGA、PGA大小
- 如何调整Oracle Redo Logfile日志文件的大小?