根据Oracle官方的宣传12.1.0.2的In-Memory组件实现内存列存储提高Oracle性能而且弥补在列存储中的不足。感谢Lunar的文档支持
12.1.0.2版本
[oracle@localhost ~]$ sqlplus chf/xifenfei@pdb1 SQL*Plus: Release 12.1.0.2.0 Beta on Thu Apr 24 21:39:43 2014 Copyright (c) 1982, 2014, Oracle. All rights reserved. Connected to: Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit With the Partitioning, OLAP, Advanced Analytics and Real Application Testing options SQL> select * from v$version; BANNER CON_ID -------------------------------------------------------------------------------- ---------- Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit 0 PL/SQL Release 12.1.0.2.0 - 0 CORE 12.1.0.2.0 0 TNS for Linux: Version 12.1.0.2.0 - 0 NLSRTL Version 12.1.0.2.0 - 0
关于In-Memory组件
SQL> select parameter,value from v$option where parameter like 'In-Memory%'; PARAMETER VALUE ---------------------------------------------------------------- ------------- In-Memory Column Store TRUE In-Memory Aggregation TRUE
关于inmemory参数
SQL> select NAME,value,DESCRIPTION from v$parameter where NAME like 'inmemory%'; NAME VALUE -------------------- -------------------- DESCRIPTION --------------------------------------------------- inmemory_size 0 size in bytes of in-memory area inmemory_clause_defa ult Default in-memory clause for new tables inmemory_force DEFAULT Force tables to be in-memory or not inmemory_query ENABLE Specifies whether in-memory queries are allowed
启用In-Memory功能
SQL> show parameter inmemory; NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ inmemory_clause_default string inmemory_force string DEFAULT inmemory_query string ENABLE inmemory_size big integer 0 SQL> alter system set inmemory_size=200M scope=spfile; System altered. SQL> shutdown immediate Pluggable Database closed. SQL> startup Pluggable Database opened. SQL> show parameter inmemory; NAME TYPE VALUE ------------------------------------ ----------- ---------------------- inmemory_clause_default string inmemory_force string DEFAULT inmemory_query string ENABLE inmemory_size big integer 200M
创建测试表
SQL> create table t_xifenfei_in_memory as select * from dba_objects; Table created. SQL> select TABLE_NAME,INMEMORY_PRIORITY,INMEMORY_DISTRIBUTE,INMEMORY_COMPRESSION from user_tables; TABLE_NAME INMEMORY INMEMORY_DISTRI INMEMORY_COMPRESS ------------------------------ -------- --------------- ----------------- T_XIFENFEI_IN_MEMORY SQL> alter table T_XIFENFEI_IN_MEMORY inmemory; Table altered. SQL> select TABLE_NAME,INMEMORY_PRIORITY,INMEMORY_DISTRIBUTE,INMEMORY_COMPRESSION from user_tables; TABLE_NAME INMEMORY INMEMORY_DISTRI INMEMORY_COMPRESS ------------------------- -------- --------------- ----------------- T_XIFENFEI_IN_MEMORY NONE AUTO DISTRIBUTE FOR QUERY
