EXP中参数compress=y是否导致imp时initial值的变化
来源:互联网 发布:nginx 代理内网发邮件 编辑:程序博客网 时间:2024/05/21 08:55
EXP中compress=y是否导致imp时initial值的变化
举例证明:
导出库版本、平台:11.2,windows
导入库版本、平台:10.2,linux
1.创建测试表:
SQL> conn scott/xyc已连接。SQL> create table test_c as select * from sys.dba_objects;表已创建。
2.查看导出库中表test_c的initial大小
SQL> set pagesize 0SQL> set long 20000000000SP2-0268: long 选项的编号无效SQL> set long 2000000SQL> select dbms_metadata.get_ddl('TABLE','TEST_C','SCOTT') from dual; CREATE TABLE "SCOTT"."TEST_C" ( "OWNER" VARCHAR2(30), "OBJECT_NAME" VARCHAR2(128), "SUBOBJECT_NAME" VARCHAR2(30), "OBJECT_ID" NUMBER, "DATA_OBJECT_ID" NUMBER, "OBJECT_TYPE" VARCHAR2(19), "CREATED" DATE, "LAST_DDL_TIME" DATE, "TIMESTAMP" VARCHAR2(19), "STATUS" VARCHAR2(7), "TEMPORARY" VARCHAR2(1), "GENERATED" VARCHAR2(1), "SECONDARY" VARCHAR2(1), "NAMESPACE" NUMBER, "EDITION_NAME" VARCHAR2(30) ) SEGMENT CREATION IMMEDIATE PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT) TABLESPACE "USERS"
可以看到导出库中表test_c的initial为65536
3.查看表test-c占用空间
SQL> select segment_name, bytes from user_segments where segment_name = 'TEST_C';SEGMENT_NAME BYTES------------------------------ ----------TEST_C 9437184
可以看到导出库中表test_c占用空间为9437184
4.导出表test_c
[oracle@s1 ~]$ exp scott/xyc@orcl compress=y file=/home/oracle/exptab_test_c.dmp tables=test_c;Export: Release 10.2.0.1.0 - Production on Fri Apr 5 05:44:54 2013Copyright (c) 1982, 2005, Oracle. All rights reserved.Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - ProductionWith the Partitioning, OLAP, Data Mining and Real Application Testing optionsExport done in US7ASCII character set and AL16UTF16 NCHAR character setserver uses AL32UTF8 character set (possible charset conversion)About to export specified tables via Conventional Path .... . exporting table TEST_C 73167 rows exportedExport terminated successfully without warnings.
5.导入表test_c
[oracle@s1 ~]$ imp scott/xyc file=/home/oracle/exptab_test_c.dmp tables=test_cImport: Release 10.2.0.1.0 - Production on Fri Apr 5 05:47:23 2013Copyright (c) 1982, 2005, Oracle. All rights reserved.Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - ProductionWith the Partitioning, OLAP and Data Mining optionsExport file created by EXPORT:V10.02.01 via conventional pathimport done in US7ASCII character set and AL16UTF16 NCHAR character setimport server uses WE8ISO8859P1 character set (possible charset conversion). importing SCOTT's objects into SCOTT. importing SCOTT's objects into SCOTT. . importing table "TEST_C" 73167 rows importedImport terminated successfully without warnings.
6.在导入库查看test_c表的initial值大小
SQL> select dbms_metadata.get_ddl('TABLE','TEST_C','SCOTT') from dual; CREATE TABLE "SCOTT"."TEST_C" ( "OWNER" VARCHAR2(30), "OBJECT_NAME" VARCHAR2(128), "SUBOBJECT_NAME" VARCHAR2(30), "OBJECT_ID" NUMBER, "DATA_OBJECT_ID" NUMBER, "OBJECT_TYPE" VARCHAR2(19), "CREATED" DATE, "LAST_DDL_TIME" DATE, "TIMESTAMP" VARCHAR2(19), "STATUS" VARCHAR2(7), "TEMPORARY" VARCHAR2(1), "GENERATED" VARCHAR2(1), "SECONDARY" VARCHAR2(1), "NAMESPACE" NUMBER, "EDITION_NAME" VARCHAR2(30) ) PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING STORAGE(INITIAL 9437184 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT) TABLESPACE "USERS"
可以看到导出库中表test_c的initial为9437184,和导出库中表test_c占用空间相等,说明EXP中compress=y导致了imp时initial值的变化
- EXP中参数compress=y是否导致imp时initial值的变化
- EXP中参数compress=y是否导致imp时initial值的变化
- exp、imp compress=y
- EXP的compress=Y参数含义
- oracle数据库备份EXP的compress=Y参数
- exp/imp命令以及commit=y参数
- exp和imp的参数
- oracle中imp导入参数show=y 详解
- EXP/IMP 命令参数
- exp & imp 及参数
- imp exp参数详解
- EXP/IMP 命令参数
- oracle中exp命令row=y和full=y,ignore=y的意思
- oracle中exp命令row=y和full=y,ignore=y的意思
- exp后INITIAL_EXTENT增加,HWM不降---原因compress=y(默认)
- oracle中exp,imp的使用详解
- oracle中exp,imp的使用详解
- oracle中exp,imp的使用详解
- zju-Gift?!-dfs
- OGG-01028:Object with object number 124750 is compressed. Table compression is not supported.
- Hadoop安全模式的理解
- C语言编译全过程
- Uva 10222 - Decode the Mad man
- EXP中参数compress=y是否导致imp时initial值的变化
- 解决win8下不能安装VirtualBox虚拟机
- 6_1const对象运用的错误
- UML基础知识
- 第六周上机任务项目2-(a)
- java.io.FileNotFoundException: /exapp/hadoop/name/current/VERSION (Permission denied)
- My First Blog
- Java遇到的一个小问题
- hdu2058