10g r2后impdp 导入仅数据结构导致 索引等统计信息锁定

小记：

有次数据库用IMPDP/EXPDP迁移结束后，发现有些表的查询比迁移前更慢了非常，首先检查了该schema 的统计信息，发现db_ind_statistics 表中该schema的 stattype_locked 的值都是all.

分析这次迁移的整个过程：

1）expdp 导出数据结构（content=metadata_only）

2）expdp 导出数据        （content=data_only）

3）impdp 导入数据结构

4）impdp 导入数据

故事发展：

翻查后发现expdp并impdp 数据结构和结构后会将统计信息锁定，如果此时手动去做分析，会出现ora-20005，该错误10g后就存在，因为以前都是全导，故没有碰到这么妖的问题。可以通过如下方法 workaroud 这个问题：

expdp  content=metadata_only  的时候使用 exclude=(table_statistics,index_statistics) 。

然后手动导出、导入统计信息：

故事后记：

当我们手动对统计信息操作时候，可以通过如下命令：

1）手动锁定统计信息方法：

exec dbms_stats.lock_schema_stats('TABLE_NAME');

2）手动解锁统计信息方法：

exec dbms_stats.unlock_schema_stats('TABLE_NAME');

IMPDP/EXPDP 方法验证，仅从源端导出表结构，并导入目标端的测试（统计信息果然被lock）：

SQL> select * from v$version;

BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
PL/SQL Release 11.2.0.1.0 - Production
CORE    11.2.0.1.0      Production
TNS for Linux: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production
SQL>
SQL> select * from all_directories;

OWNER                          DIRECTORY_NAME                 DIRECTORY_PATH
------------------------------ ------------------------------ ----------------------------------------------------------------------------
SYS                            BACKUP                         /home/oracle/backup
SYS                            SUBDIR                         /u01/app/oracle/product/11.2.0/dbhome_1/demo/schema/order_entry//2002/Sep
SYS                            SS_OE_XMLDIR                   /u01/app/oracle/product/11.2.0/dbhome_1/demo/schema/order_entry/
SYS                            LOG_FILE_DIR                   /u01/app/oracle/product/11.2.0/dbhome_1/demo/schema/log/
SYS                            DATA_FILE_DIR                  /u01/app/oracle/product/11.2.0/dbhome_1/demo/schema/sales_history/
SYS                            XMLDIR                         /ade/b/1191423112/oracle/rdbms/xml
SYS                            MEDIA_DIR                      /u01/app/oracle/product/11.2.0/dbhome_1/demo/schema/product_media/
SYS                            DATA_PUMP_DIR                  /u01/app/oracle/admin/wtf/dpdump/
SYS                            ORACLE_OCM_CONFIG_DIR          /u01/app/oracle/product/11.2.0/dbhome_1/ccr/state

9 rows selected.

SQL> !
[oracle@test1 ~]$ expdp scott/tiger directory=backup dumpfile=scott.dmp content=metadata_only

Export: Release 11.2.0.1.0 - Production on Wed Feb 27 02:00:34 2013

Copyright (c) 1982, 2009, Oracle and/or its affiliates.  All rights reserved.

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Starting "SCOTT"."SYS_EXPORT_SCHEMA_01":  scott/******** directory=backup dumpfile=scott.dmp content=metadata_only
Processing object type SCHEMA_EXPORT/USER
Processing object type SCHEMA_EXPORT/SYSTEM_GRANT
Processing object type SCHEMA_EXPORT/ROLE_GRANT
Processing object type SCHEMA_EXPORT/DEFAULT_ROLE
Processing object type SCHEMA_EXPORT/PRE_SCHEMA/PROCACT_SCHEMA
Processing object type SCHEMA_EXPORT/SEQUENCE/SEQUENCE
Processing object type SCHEMA_EXPORT/TABLE/TABLE
Processing object type SCHEMA_EXPORT/TABLE/INDEX/INDEX
Processing object type SCHEMA_EXPORT/TABLE/CONSTRAINT/CONSTRAINT
Processing object type SCHEMA_EXPORT/TABLE/INDEX/STATISTICS/INDEX_STATISTICS
Processing object type SCHEMA_EXPORT/TABLE/COMMENT
Processing object type SCHEMA_EXPORT/TABLE/CONSTRAINT/REF_CONSTRAINT
Processing object type SCHEMA_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
Master table "SCOTT"."SYS_EXPORT_SCHEMA_01" successfully loaded/unloaded
******************************************************************************
Dump file set for SCOTT.SYS_EXPORT_SCHEMA_01 is:
/home/oracle/backup/scott.dump
Job "SCOTT"."SYS_EXPORT_SCHEMA_01" successfully completed at 02:02:02

[oracle@test1 ~]$ exit
exit

SQL> show user
USER is "SYS"
SQL> drop user test cascade;

User dropped.

SQL> !

[oracle@test1 backup]$ impdp scott/tiger directory=backup dumpfile=scott.dmp remap_schema=scott:test

Import: Release 11.2.0.1.0 - Production on Wed Feb 27 02:07:39 2013

Copyright (c) 1982, 2009, Oracle and/or its affiliates.  All rights reserved.

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Master table "SCOTT"."SYS_IMPORT_FULL_01" successfully loaded/unloaded
Starting "SCOTT"."SYS_IMPORT_FULL_01":  scott/******** directory=backup dumpfile=scott.dump remap_schema=scott:test
Processing object type SCHEMA_EXPORT/USER
Processing object type SCHEMA_EXPORT/SYSTEM_GRANT
Processing object type SCHEMA_EXPORT/ROLE_GRANT
Processing object type SCHEMA_EXPORT/DEFAULT_ROLE
Processing object type SCHEMA_EXPORT/PRE_SCHEMA/PROCACT_SCHEMA
Processing object type SCHEMA_EXPORT/SEQUENCE/SEQUENCE
Processing object type SCHEMA_EXPORT/TABLE/TABLE
Processing object type SCHEMA_EXPORT/TABLE/INDEX/INDEX
Processing object type SCHEMA_EXPORT/TABLE/CONSTRAINT/CONSTRAINT
Processing object type SCHEMA_EXPORT/TABLE/INDEX/STATISTICS/INDEX_STATISTICS
Processing object type SCHEMA_EXPORT/TABLE/CONSTRAINT/REF_CONSTRAINT
Processing object type SCHEMA_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
Job "SCOTT"."SYS_IMPORT_FULL_01" successfully completed at 02:07:56

[oracle@test1 backup]$ exit
exit

SQL> select owner,table_name,index_name,stattype_locked from dba_ind_statistics where owner='TEST';

OWNER                          TABLE_NAME                INDEX_NAME       STATTYPE_LOCKED
------------------------------ --------------------- --------------------- ----------------
TEST                           DEPT                      PK_DEPT           ALL
TEST                           DEPT                      DX_DNAME          ALL
TEST                           EMP                       PK_EMP            ALL

参考文献：

1).Subject:  ORA-38029 "Object Statistics Are Locked" - Possible Causes
  Doc [ID 433240.1] Type:  PROBLEM

  Modified Date :  11-JUN-2008 Status:  PUBLISHED