Sometimes, just occasionally, you find yourself as a DBA on a site where, for some strange and unknown reason, you don’t have an Entity Relationship Diagram (ERD) for the database that you are working on. You could use a tool such as
SQL*Plus (or even,
SQL Developer – if you must) to generate a list of referential integrity constraints. There has to be a better way. Continue reading Generate Entity Relationship Diagrams from a SQL Script.
(Snorkelling is not quite as in depth as a “deep dive”!)
Attempting to parse a
listener.log will probably bend your brain, but I needed to do it recently to determine which unique servers and/or desktops and/or application servers were still connecting to a database prior to that database going down for maintenance. This was an exercise in confirming that the documentation we have, is correct.
Continue reading Snorkelling in the Oracle Listener Logs.
You know the score, you are running an
impdp and it looks to have hung up. You’ve watched the log file (or on screen messages) and it’s sitting at something like:
Processing object type TABLE_EXPORT/TABLE/INDEX/INDEX
Continue reading IMPDP Hangs, or Appears to Hang – But Has it?
TraceMiner has been updated and rewritten. Numerous bugs and foibles have been fixed.
TraceAdjust is a new, useful, utility to carry out some pre-processing on a trace file before you have to use your own weary eyes to work thorough potential Oracle performance problems! That’s why I wrote it!
Continue reading TraceMiner2 and TraceAdjust
TraceMiner has been updated again. Mostly bug fixes, but there’s a little enhancement too. The current release is 0.21.
Continue reading TraceMiner Updated Again
TraceMiner has been updated after a couple of foibles were found during the processing of a trace file. Continue reading TraceMiner Utility – Updated
I have a table with dates in, and some NULLs. Two people, on the same database, running the same
SELECT query, in the same schema, with the same privileges, get vastly differing results. Why? Fine Grained Auditing is not at play here. Continue reading Interesting Foible with Oracle Dates
I recently posted a useful
oraenv for Windows utility. This has been updated so that you can run it in batch files by passing the desired Oracle SID on the command line. Details at http://qdosmsq.dunbar-it.co.uk/blog/2016/08/oraenv-for-windows/
Having recently had to learn a whole new way of working when I took on a contract migrating a database to the Windows “cloud”, I realised that there’s no equivalent to the useful Unix
oraenv utility. I had to write my own. Give me a
bash shell any day! Continue reading Oraenv for Windows
It’s always nice to know which extra cost Oracle options are enabled, whether deliberately or silently as the result of some patching that has taken place. Continue reading Which Extra Cost Oracle Options is my Windows Server Running?
I found a broken check constraint, one that simply wouldn’t work, on a database. It was created as:
... CHECK(COLUMN_NAME IN ('Y','N',NULL)) ;
Try it yourself, it doesn’t work! Anyway, I needed to find if there were any other check constraints broken in this manner, so I did the following:
Continue reading Dropping Temporary Tables (With Bonus, Broken Check Constraints!)
This applies to Linux, Unix as well as Windows, but affected me on a Windows 2012 Server running Oracle 184.108.40.206 Enterprise Edition.
My user on the server was an administration user, but not in the
ora_dba group. This is required to
connect / as sysdba within SQL*Plus. The SYS password had been changed recently but whoever did it, did not update the password vault. The users were urgently requiring their database be started, I was the only DBA in the office, the SYS password was unknown, and my user didn’t belong directly to the
ora_dba group. What to do? Continue reading How to Start an Oracle Database When You Are Not in the DBA Group
For no reason, after many weeks of use, RMAN suddenly cannot connect:
rman target sys/******@dbadb01 catalog ...
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00601: fatal error in recovery manager
RMAN-03010: fatal error during library cache pre-loading
RMAN-10038: database session for channel default terminated unexpectedly
Continue reading RMAN Connection Troubles, RMAN-03010 & RMAN-10038
I’ve recently begun a new contract migrating a Solaris 9i database to Oracle 11gR2 on Windows, in the Azure cloud. I hate windows with a vengeance and this hasn’t made me change my opinion!
One of the planned improvements is to have everyone using a standard, central
tnsnames.ora file for alias resolution. A good plan, and the company has incorporated my own tnsnames checker utility to ensure that any edits are valid and don’t break anything.
I found that the
tnsnames.ora in my local Oracle Client install, was not working. Here’s what I had to do to fix it. Continue reading Tnsnames.ora, IFILE and Network Drives on Windows
Have you ever needed to trawl through an Oracle Trace file to extract the SQL statements executed and found a whole load of bind variables have been used, so you need to find the
BINDS section, extract the values, and virtually paste them into the parsed SQL statement?
No? This utility isn’t for you then. Continue reading TraceMiner – An Oracle Utility to Mine 10046 Trace Files