expdp 导出时报错 怎么解决
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用expdp对Oracle数据库的一个schema导出操作时，报ORA-12170错误，如下：
expdp ab/"Ab@0622" directory=dump schemas=ab dumpfile=ab-1010b.dmp logfile=ab1010.log
Export: Release 11.2.0.4.0 - Production on Mon Oct 10 16:42:25 2016
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
UDE-12170: operation generated ORACLE error 12170
ORA-12170: TNS:Connect timeout occurred
expdp ab/"Ab@0622" directory=dump schemas=ab dumpfile=ab-1010b.dmp logfile=ab1010.log
Export: Release 11.2.0.4.0 - Production on Mon Oct 10 16:42:25 2016
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
UDE-12170: operation generated ORACLE error 12170
ORA-12170: TNS:Connect timeout occurred
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