Oracle-37-内存管理

内存管理分为PGA和SGA

PGA

查看PGA参数

SYS@ orcl>show parameter area_size

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
bitmap_merge_area_size               integer     1048576
create_bitmap_area_size              integer     8388608
hash_area_size                       integer     131072
sort_area_size                       integer     65536
workarea_size_policy                 string      AUTO
SYS@ orcl>

SYS@ orcl>show parameter workarea

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
workarea_size_policy                 string      AUTO

这个参数表示PGA是自动管理，在9i版本后引入 

SYS@ orcl>show parameter pga

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
pga_aggregate_target                 big integer 0

SYS@ orcl>select sum(pga_used_mem) from v$process;

SUM(PGA_USED_MEM)
-----------------
        105952640

Elapsed: 00:00:00.01

SGA参数

SYS@ orcl>show parameter sga_max

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
sga_max_size                         big integer 752M

SYS@ orcl>show parameter memory

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
hi_shared_memory_address             integer     0
memory_max_target                    big integer 752M
memory_target                        big integer 752M
shared_memory_address                integer     0