Oracle datapump expdp/impdp 导入导出数据库时hang住


最近在导出schema级别的数据时被hang住,不得不停止当前的导出作业,如果你有类似的问题,请继续往下看。
 
1、问题描述
    导出整个schema时数据库被hang住,如下所示
    符号">"是由SecureCRT设定的每300秒发送一次
    Oracle@Dev-DB-04:~> expdp goex_admin/xxx directory=db_dump_dir dumpfile=gobo2.dmp logfile=gobo2.log schemas=goex_admin
   
    Export: Release 10.2.0.4.0 - 64bit Production on Thursday, 23 May, 2013 9:30:52
   
    Copyright (c) 2003, 2007, Oracle.  All rights reserved.
   
    Connected to: Oracle Database 10g Release 10.2.0.4.0 - 64bit Production
    Starting "GOEX_ADMIN"."SYS_EXPORT_SCHEMA_01":  goex_admin/******** directory=db_dump_dir dumpfile=gobo2.dmp
    logfile=gobo2.log schemas=goex_admin
    >>>>
 
    -->查询超长时间的操作,没有任何结果,也就是说datapump压根啥也没有做
    goex_admin@GOBO2> @long_ops
   
    no rows selected
   
    -->查询job产生的对象的表,表存在
    goex_admin@GOBO2> @datapump_master_tb
   
    STATUS  OBJECT_ID OBJECT_TYPE        OWNER_OBJECT
    ------- ---------- ------------------- --------------------------------------------------
    VALID      315838 TABLE              GOEX_ADMIN.SYS_EXPORT_SCHEMA_01
 
2、问题解决
    参数fixed_date引起数据库导入导出被hang住 [ID 563171.1]
    goex_admin@GOBO2> show parameter fixed
   
    NAME                                TYPE        VALUE
    ------------------------------------ ----------- ------------------------------
    fixed_date                          string      20130506 16:00:00
   
    -- Author : Robinson
   
    goex_admin@GOBO2> alter system set fixed_date=none;
   
    System altered.
   
    -->参数fixed_date被移除后,导出正常
    oracle@Dev-DB-04:~> expdp goex_admin/xxx directory=db_dump_dir dumpfile=gobo2.dmp logfile=gobo2.log schemas=goex_admin
   
    Export: Release 10.2.0.4.0 - 64bit Production on Thursday, 23 May, 2013 9:30:52
   
    Copyright (c) 2003, 2007, Oracle.  All rights reserved.
   
    Connected to: Oracle Database 10g Release 10.2.0.4.0 - 64bit Production
    Starting "GOEX_ADMIN"."SYS_EXPORT_SCHEMA_01":  goex_admin/******** directory=db_dump_dir dumpfile=gobo2.dmp
    logfile=gobo2.log schemas=goex_admin
    >>>>
    Estimate in progress using BLOCKS method...
    Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA
    Total estimation using BLOCKS method: 89.31 MB
    Processing object type SCHEMA_EXPORT/USER
    Processing object type SCHEMA_EXPORT/SYSTEM_GRANT
    .......................
    Processing object type SCHEMA_EXPORT/POST_SCHEMA/PROCACT_SCHEMA
    . . exported "GOEX_ADMIN"."GO_GA_CUST_TBL"              148.4 KB    551 rows
    . . exported "GOEX_ADMIN"."GO_GA_ACC_TBL"                167.9 KB    533 rows
 
3、参数FIXED_DATE
    FIXED_DATE enables you to set a constant date that SYSDATE will always return instead of the current date.
    To undo a fixed date setting, specify FIXED_DATE=NONE. This parameter is useful primarily for testing.
    The value can be in the format shown above or in the default Oracle date format, without a time.
   
    FIXED_DATE参数可以定义当前的日期为一个常量而不随系统日期的变化而变化,通常用于测试目的使用
    对于使用datapump进行导入导出的情形,应考虑将该参数设置为none来避免导入导出hang住的问题
    该参数影响的版本Version 10.1.0.2 to 11.2.0.3

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