Oracle ADDM shows Virtual Memory Paging on 10gR2 11gR2

Problem description

I’ve recently notices a common issue on Oracle Enterprise Linux 5.x with Oracle database 10gR2 and 11gR2. The Oracle ADDM Performance Analysis showed the following alert as a top event  in both OEM console – Virtual Memory Paging and in the ADDM report – Significant virtual memory paging was detected on the host operating system.

Problem Analysis

From the first look I thought this was a virtual memory issue on the boxes but on the other hand I could not find any evidence at OS level of any problem with virtual memory paging. Additionally I was surprised that the issue occurred at the same time on different servers and Oracle versions. So, below I did some checks to prove there was no memory issue on these Linux boxes. Read more »

Oracle Data Pump (expdp) schema export fails with ORA-01801

Platform

Oracle Database Server 10gR2 (10.2.0.5)

Problem

Data Pump (expdp) schema export fails on Oracle 10gR2 with following Oracle error:

ORA-39125: Worker unexpected fatal error in KUPW$WORKER.UNLOAD_METADATA while calling DBMS_METADATA.FETCH_XML_CLOB [TABLE_STATISTICS]
ORA-01801: date format is too long for internal buffer
ORA-06512: at "SYS.DBMS_SYS_ERROR", line 105
ORA-06512: at "SYS.KUPW$WORKER", line 6313
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