TNS Configuration files – Search order

Oracle clients (and programs that use Oracle clients/drivers) will search for TNS configuration files such as sqlnet.ora and tnsnames.ora in the following order. Note that the first file to be found will be used -- so if there were files in both location 3 and location 5, then the one in location 3 would be found first... Continue Reading →

Continue SCP’ing file(s) after log out

The unix command scp is very useful for transferring files between two hosts over a secure connection, but sometimes you need to kick off an scp command that will take several hours to complete and you want to disconnect and go home. Using "screen" One approach is to use the screen command (available only on linux AFAIK) to start the initial transfer, then... Continue Reading →

ORA-1089 reported by a database link

Recently, we encountered a strange problem whereby trying to issue a select over a database link caused an ORA-1089 "immediate shutdown in progress - no operations are permitted" error even though the source databases was up and fully operational.

RMAN: Displaying current backup progress

When performing a backup of a large database using RMAN, you often get asked "how is the backup progressing?" and "when it will complete?". Although the log produced by RMAN is detailed in almost every other aspect, there isn't any information recorded that will allow you to give a simple and straightforward answer to these questions However, the information is available within the data dictionary.

Logging PuTTY sessions

As a DBA, it is generally a good idea to log all your activity when working on Unix/Linux servers. Logging provides an audit of changes that you have made to a system as well as being a valuable resource for notes and documentation. This article describes how to log all PuTTY sessions and how to automtically maintain the resulting logfiles in a logical directory structure.

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