oracle 11gR2 ORA-31626: job does not exist 和ORA-31687: error creating worker process with worker id ...

Oracle 11gR2 imdp 报错如下：

Import: Release 11.2.0.1.0 - Production on Mon May 3 16:25:17 2010

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 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
ORA-31626: job does not exist
ORA-31687: error creating worker process with worker id 1
ORA-31687: error creating worker process with worker id 1
ORA-31688: Worker process failed during startup.

这个错误与参数AQ_TM_PROCESSES有关。 当该参数这是为0的时候，就会报这个错误。

所以解决这个问题的方法就是在pfile里移除这个参数的设置。然后重启DB就可以了。

11gR2 在线文档对该参数的说明如下：

AQ_TM_PROCESSES

Property	Description
Parameter type	Integer
Default value	None
Modifiable	ALTER SYSTEM
Range of values	0 to 40
Basic	No

AQ_TM_PROCESSES controls time monitoring on queue messages and controls processing of messages with delay and expiration properties specified.You do not need to specify a value for this parameter because Oracle Database automatically determines the number of processes and autotunes them, as necessary. Therefore, Oracle highly recommends that you leave the AQ_TM_PROCESSES parameter unspecified and let the system autotune.

Note:

If you want to disable the Queue Monitor Coordinator, then you must set AQ_TM_PROCESSES to 0 in your parameter file. Oracle strongly recommends that you do NOT set AQ_TM_PROCESSES to 0. If you are using Oracle Streams, then setting this parameter to zero (which Oracle Database respects no matter what) can cause serious problems.

在Oracle 10g中，该参数默认值是0.

AQ_TM_PROCESSES

Property	Description
Parameter type	Integer
Default value	0
Modifiable	ALTER SYSTEM
Range of values	0 to 10
Basic	No

<!-- class="inftblinformal" -->AQ_TM_PROCESSES enables time monitoring of queue messages. The times can be used in messages that specify delay and expiration properties. Values from 1 to 10 specify the number of queue monitor processes created to monitor the messages. If AQ_TM_PROCESSES is not specified or is set to 0, then the queue monitor is not created.

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