Method: 1. Use "alter system set sga_max_size/sga_target=numeric value..." to modify the size of sga; 2. Use "alter system set pga_aggregate_target=numeric value..." to modify the size of pga.
The operating environment of this tutorial: Windows 10 system, Oracle 11g version, Dell G3 computer.
1. Modify the sga size:
SQL> alter system set sga_max_size=2560M scope=spfile; System altered. SQL> alter system set sga_target=2560M scope=spfile; System altered.
2. Modify the pga size:
SQL> alter system set pga_aggregate_target=650M scope=spfile; System altered.
Expand knowledge:
Modify the size of instance sga and pga:
Idea: First create a pfile as a backup by specifying the path in spfile, and then adjust the memory parameters in the database.
—>Modify sga, pga related parameters in the database—>Create spfile through this pfile—>Close the database—>Finally start the database normally
First: Create a spfile backup
#/u01/app/oracle/admin/orcl/pfile/pfile1.ora是通过当前spfile创建的文件名字叫 “pfile1.ora” SQL> create pfile='/u01/app/oracle/admin/orcl/pfile/pfile1.ora' from spfile; File created. SQL>
1. Check the memory_target and memory_max_target sizes:
SQL> show parameter memory NAME TYPE VALUE -------------------------------- ----------- ------------------------------ hi_shared_memory_address integer 0 memory_max_target big integer 0 memory_target big integer 0 shared_memory_address integer 0 SQL>
#According to the output results, memory_max_target=0 and memory_target=0 are displayed, indicating that it is already in ASMM mode. You can directly modify the sga and pga sizes
2. (If the value is non-zero) Modify the size of memory_target and memory_max_target:
#If memory_max_target is non-0 and memory_target is non-0, use the following command to change the value to 0
1 , Modify memory_max_target size:
SQL> alter system set memory_max_target=0 scope=spfile; System altered.
2. Modify memory_target size (memory_target<=memory_max_target):
SQL> alter system set memory_target=0 scope=spfile; System altered.
Recommended tutorial: "Oracle Video Tutorial"
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