Daily Archives: 2014 年 04 月 24 日

ORACLE 12C In-Memory组件初试

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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