Database management

OracleText: deletes and garbage

By Franck Pachot . In the previous post we have seen how the OracleText index tables are maintained when new document arrives: At sync the new documents are read up to the available memory and words are inserted(…)

OracleText: inserts and fragmentation

By Franck Pachot . I plan to write several posts about OracleText indexes, which is a feature that is not used enough in my opinion. It’s available in all editions and can index small text or large documents to(…)

SQL Server monitoring with nagios: installation

Nagios is an IT Infrastructure monitoring solution which is able to monitor SQL Server instances with a specific plugin. I have installed this plugin to test those functionalities and I will explain here how to do it. Prerequisites installation(…)

Considerations about SQL Server database files placement, Netapp storage and SnapManager

When you install SQL Server, you have to consider how to place the database files. At this point you will probably meet the well-known best practices and guidelines provided by Microsoft but are you really aware of the storage vendor(…)

Security via policies

Few weeks ago, I presented the session on security via Policies for “Les journées SQL Server 2014”, organized by the French SQL Server User Group (GUSS) in Paris. I promised to post our policies script(…)

Never gather WORKLOAD stats on Exadata…

By Franck Pachot . For Exadata, oracle has introduced an ‘EXADATA’ mode which sets a high transfer rate (with IOTFRSPEED as in NOWORKLOAD statistics) and set a MBRC (as in WORKLOAD statistics). Those values are set rather than gathered(…)

Oracle multitenant dictionary: rowcache

By Franck Pachot . I’ve not finished with my investigation on 12c multitenant dictionary. Here, I’m checking how metadata links are managed by the dictionary cache (aka rowcache). As I did previously, I’ll create a metadata link function(…)

Flush one SQL statement to hard parse it again

By Franck Pachot . If you want a statement to be hard parsed on its next execution, you can flush the shared pool, but you don’t want all the cursors to be hard parsed. Here is how to flush(…)

Stay with non-CDB or go to CDB?

By Franck Pachot . This is a question that starts to be raised quite frequently. Oracle released the multitenant architecture 1.5 year ago. And now says that the previous architecture – known as non-CDB – is deprecated. What does(…)

When to gather workload system statistics?

By Franck Pachot . This month we started to give our Oracle Tuning Workshop. And with a new workshop comes new questions. We advise to give to the optimizer the most accurate statsistics that we can have. That(…)