[Oracle] Data Pump 详细使用教程（5）- 命令交互模式

当我们起了一个datapump job之后，可以通过v$session_longops查看当前进度。

USERNAME - job owner  
OPNAME - job name  
TARGET_DESC - job operation  
SOFAR - megabytes transferred thus far during the job  
TOTALWORK - estimated number of megabytes in the job  
UNITS - megabytes (MB)  
MESSAGE - a formatted status message of the form:  
'job_name: operation_name : nnn out of mmm MB done'

SYS@TEST16>select username,opname,sofar,TOTALWORK,UNITS,message from v$session_longops where opname='SYS_EXPORT_FULL_03';

USERNAME        OPNAME                    SOFAR  TOTALWORK UNITS MESSAGE
--------------- -------------------- ---------- ---------- ----- ------------------------------------------------------------
SYSTEM          SYS_EXPORT_FULL_03         4737      35368 MB    SYS_EXPORT_FULL_03: EXPORT : 4737 out of 35368 MB done

但有时候单单监控是不够的，我们可能还需要修改相应的JOB，这时我们就需要进行datapumo的命令交互模式。

有两种方式可以进入命令交互模式，分别是：

1. 在logging模式下按ctrl+C

2. expdp or impdp attach=SYSTEM.SYS_EXPORT_FULL_03

expdp交互模式的命令如下：

Activity	Command Used
Add additional dump files.	ADD_FILE
Exit interactive mode and enter logging mode.	CONTINUE_CLIENT
Stop the export client session, but leave the job running.	EXIT_CLIENT
Redefine the default size to be used for any subsequent dump files.	FILESIZE
Display a summary of available commands.	HELP
Detach all currently attached client sessions and terminate the current job.	KILL_JOB
Increase or decrease the number of active worker processes for the current job. This command is valid only in the Enterprise Edition of Oracle Database 11g.	PARALLEL
Restart a stopped job to which you are attached.	START_JOB
Display detailed status for the current job and/or set status interval.	STATUS
Stop the current job for later restart.	STOP_JOB

impdp的交互模式命令如下：

Activity	Command Used
Exit interactive-command mode.	CONTINUE_CLIENT
Stop the import client session, but leave the current job running.	EXIT_CLIENT
Display a summary of available commands.	HELP
Detach all currently attached client sessions and terminate the current job.	KILL_JOB
Increase or decrease the number of active worker processes for the current job. This command is valid only in Oracle Database Enterprise Edition.	PARALLEL
Restart a stopped job to which you are attached.	START_JOB
Display detailed status for the current job.	STATUS
Stop the current job.	STOP_JOB

下面以expdp为例，介绍几个常用命令（如果忘记命令，敲万能的help）。

1. status：查看当前job的状态，如完成的百分比、并行度等，每个worker代表一个并行进程。

Export> status

Job: SYS_EXPORT_FULL_03
  Operation: EXPORT                         
  Mode: FULL                           
  State: EXECUTING                      
  Bytes Processed: 8,357,285,928
  Percent Done: 23
  Current Parallelism: 2
  Job Error Count: 0
  Dump File: /home/oracle/dump/full_%u.dmp
  Dump File: /home/oracle/dump/full_01.dmp
    bytes written: 8,357,294,080
  Dump File: /home/oracle/dump/full_02.dmp
    bytes written: 4,096
  
Worker 1 Status:
  Process Name: DW00
  State: EXECUTING                      
  Object Type: DATABASE_EXPORT/SCHEMA/TABLE/COMMENT
  Completed Objects: 5,120
  Worker Parallelism: 1
  
Worker 2 Status:
  Process Name: DW01
  State: EXECUTING                      
  Object Schema: P95169
  Object Name: GRADE_RCCASE
  Object Type: DATABASE_EXPORT/SCHEMA/TABLE/TABLE_DATA
  Completed Objects: 3
  Total Objects: 1,866
  Completed Rows: 23,505,613
  Worker Parallelism: 1

2. parallel：动态调整并行度

Export> parallel=4

3. add_file：增加dumpfile

Export> ADD_FILE=hr2.dmp, dpump_dir2:hr3.dmp

4. stop_job, kill_job, start_job

stop_job只是暂停，之后可以用start_job重新启动，而kill_job直接杀掉，不可恢复

5. continue_client：退出交互模式，进入logging模式；

exit_client: 退出客户端