How to write to the alert log

Juste in case you wondered, yes it is possible to write custom messages directly to the alert log. For this, you’ll have to use the procedure ksdwrt stored in the dbms_system supplied package. This can be a useful way to implement custom messages when you execute a stored procedure, or it can help with testing by generating alerts.

SQL> execute dbms_system.ksdwrt(2, 'TEST --- write to log');

or you can include a time-stamp as well.

SQL> execute sys.dbms_system.ksdwrt(2,to_char(sysdate)|| ' -- ');

The first parameter can be 1, 2 or 3.

1. Writes to the alert log.

2. Writes to the trace file.

3. Writes to both.

Tags:

Forcing ASMM component to shrink

#oracle #database

Here's the way to force the shared pool to shrink dynamically. Documentation states that ASMM can only increase shared pool, and can't shrink. When the automatic shared memory management feature is enabled, the internal tuning algorithm tries to determine an optimal size for the shared pool based on the workload. It usually converges on this va... Read more

20 Mar 2019 - 2 minute read

How to extract Oracle user DDL

#database #oracle

In some cases, you need to duplicate an Oracle user, along with all it's privileges. Doing this manually can be tedious. Hopefully, we can use the data dictionary to extract the data we need and dump it into a SQL file to modify and replay. Here's how to do it: ```sql set head off set pages 0 set long 9999999 spool user_script.sql SELECT DBMS... Read more

20 Feb 2018 - 1 minute read

Restart a hung Oracle database

#oracle

On rare occasions, mostly during a high server load peak or a process failure, an Oracle instance may not accept any connection. Either from regular users as well as SYSDBA. This situation is called a **hung database** and must be quickly resolved as the database isn't accessible for your users anymore. As you cannot connect to the hung database... Read more

20 May 2017 - 1 minute read