Data Pump: The Time Zone Pitfalls

Data Pump: The Time Zone Pitfalls

Photo by Luis Cortes on Unsplash

Last week a very experienced colleague called me. He had issues with an export dump taken from an Oracle 20c database importing into 19c. It failed. So this blog post is about Data Pump: The Time Zone Pitfalls.

The Case

Usually you will see this issue only when you try to export from a higher version, and then attempt to import into a lower one. But the same thing can happen when you patched your databases partially with a newer time zone patch regardless of the version.

My colleague saw this error:

impdp system/welcome1@//localhost:1521/MYDB 
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What happens to PASSWORD_VERSIONS during an upgrade to Oracle 12.2?

I did blog a day ago about ORA-1017 connection issues in Oracle Database 12.2 once you would like to use the deprecated init.ora/spfile parameter SEC_CASE_SENSITIVE_LOGON=FALSE:

But how can this change actually happen?

Let’s check how the PASSWORD_VERSIONS is set in a fresh Oracle Database database with the January 2017 Proactive Bundle Patch applied to it:

SQL> select username, password_versions from dba_users order by 1;

------------------------------ -----------------
APPQOSSYS		       10G 11G 12C
AUDSYS			       10G 11G 12C
DBSNMP			       10G 11G 12C
DIP			       10G 11G 12C
GSMCATUSER		       10G 
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How to get the Master Table from a Data Pump expdp?

PumpInteresting question a customer had last week during the Upgrade Workshop in Munich. He’s getting export dump files from several customers and often not much information describing the contents. So how can ge find out what’s in there, which was the source characterset etc.

This seems to be a simple question but it did cost me a few searches and tests to come back with some (hopefully) useful information.

First attempt: $strings expdp.dmp > outexpdp.txt

I bet there are better ways to do this but in my case this will give me:

x86_64/Linux 2.4.xx
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