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Oracle Team

Standard Edition on Oracle Database Appliance

By | Database management, Oracle | 2 Comments

By Franck Pachot . The Oracle Database Appliance is really interresting for small enterprises. It’s very good hardware for very good price. It’s capacity on demand licensing for Enteprise Edition. But small companies usually go to Standard Edition for cost reasons. Then does it make sense to propose only Enterprise Edition to the small companies that are interrested by ODA? Is ODA for small companies? My answer is definitely yes. Small companies can’t buy specific…

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Oracle Team

Oracle 12c: Can we disable logging for DML?

By | Database management, Oracle | No Comments

By Franck Pachot . If we don’t mind about loosing our changes, then can we disable logging for DML? This is a question I’ve heard a lot. Ok, you don’t need to recover your changes but Oracle may want to recover the consistency of its datafiles anyway. And that’s why datafiles blocks changed though the buffer cache always generate redo. But yes, in 12c you can do DML and generate only minimal redo. All DML:…

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Oracle Team

OOW14 Day 4 – Internals of the 12c Multitenant Architecture by Vit Spinka

By | Database management, Oracle | No Comments

By Franck Pachot . This is the session I preferred at Oracle Open World. Well, I’m writing that before going to @ludodba one and I’m sure I’ll have then two preferred sessions… So Vit Spinka has presented the internals of the new multitenant architecture. It’s always good to play with some internals things. Not only for the geeky fun of it but also because it helps understand how it work and address issues later. I had…

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Oracle Team

What’s the consequence of NOLOGGING loads?

By | Database management, Oracle | No Comments

By Franck Pachot . When you load data in direct-path and have the NOLOGGING attribute set, you minimize redo generation, but you take the risk, in case of media recovery, to loose the data in the blocks that you’ve loaded. So you probably run a backup as soon as the load is done. But what happens if you have a crash, with media failure, before the backup is finish? I encountered recently the situation but…

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Oracle Team

Beyond In-Memory, what’s new in 12.1.0.2 ?

By | Database management, Oracle | No Comments

By Franck Pachot . It’s just a patchset. The delivery that is there to stabilize a release with all the bug fixes. But it comes with a lot of new features as well. And not only the one that has been advertised as the future of the database. It’s a huge release. Let’s have a look at what’s new. First, it seems that it will be the only patchest for 12.1 Then, there is that…

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Oracle Team

Drilling down V$RECOVERY_AREA_USAGE

By | Database management, Oracle | 4 Comments

By Franck Pachot . In a previous post I used X$KCCAGF to get more information about reclaimable archived logs in FRA, because there is a bug in standby (not opened) databases where archivelog deletion policy is ignored. I explained that the view V$RECOVERY_AREA_USAGE has only aggregated information about space reclaimable without the details about which files are reclaimable or not. Here I’ll explain how I came to X$KCCAGF and I’ll give the query to get…

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Oracle Team

Archivelog deletion policy for Standby Database in Oracle Data Guard

By | Database Administration & Monitoring, Oracle | 53 Comments

By Franck Pachot . Do you use ARCHIVELOG DELETION POLICY TO APPLIED ON ALL STANDBY for your Oracle databases in Data Guard? Maybe you also use the Fast Recovery Area as archive log destination. That’s good practice! But did you ever check that it works as expected? What I mean is this: The archived logs that you don’t need are reclaimable by the FRA when space is needed And the archived logs that are required…

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Oracle Team

UKOUG Day 3: PL/SQL hints by Tom Kyte & Oracle Active Data Guard

By | Technology Survey | No Comments

Today’s first session I assisted was presented by Tom Kyte. He talked about SQL topics we surely do not know. The first topic concerned the possibility of using the plsql_warning clause with the PL/SQL compiler. This feature exists since version 10.1 but is not widely used. The different values you can define for the plsql_warning with a classical alter session command are: Severe: code might cause unexpected errors or wrong results Performance: code might cause…

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Yann Neuhaus

“ORA-01665: control file is not a standby control file”: what can I do?

By | Database management | 3 Comments

You have certainly also received this error once in you Oracle DBA career: “ORA-01665: control file is not a standby control file” while trying to create a standby database with RMAN through a full database backup. In fact, the feature itself is not very new. It exists since at least RMAN 10g, it is called the “Restore Failover”. In order to create a Data Guard configuration, you need a standby database on the standby server….

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