12c inmemory option 初体验

检查初始化参数。

SQL> show parameter inmemory

NAME				     TYPE	 VALUE
------------------------------------ ----------- ------------------------------
inmemory_clause_default 	     string
inmemory_force			     string	 DEFAULT
inmemory_max_populate_servers	     integer	 0
inmemory_query			     string	 ENABLE
inmemory_size			     big integer 0
inmemory_trickle_repopulate_servers_ integer	 1
percent
optimizer_inmemory_aware	     boolean	 TRUE

设置inmemory_size参数并重启数据库

SQL> alter system set inmemory_size=100M scope=spfile; 

System altered.

SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started.

Total System Global Area  599785472 bytes
Fixed Size		    2927192 bytes
Variable Size		  364905896 bytes
Database Buffers	  121634816 bytes
Redo Buffers		    5459968 bytes
In-Memory Area		  104857600 bytes
Database mounted.
Database opened.

创建测试表

SQL> create table inmom_tab as select * from dba_objects;

Table created.