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Franck Pachot

Yesterday’s AWR Straight to the Goal

By | Hardware & Storage, Oracle | 6 Comments

By Franck Pachot . Yesterday I was a speaker at Collaborate15 and did my presentation about reading an AWR report. That was great. Many people (and not enough seats). Here are some aswers about questions that came later. I did that presentation at DOAG last year in a much bigger room. But because of the bigger room there was no questions, and because of the tension I felt in that big room, I made it…

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Franck Pachot

Cloning a PDB from a standby database

By | Database management, Oracle | 5 Comments

By Franck Pachot . Great events like IOUG Collaborate is a good way to meet experts we know through blogs, twitter,etc. Yesterday evening, with nice music in the background, I was talking with Leighton Nelson about cloning PDB databases. Don’t miss his session today if you are in Las Vegas. The big problem with PDB cloning is that the source must be read-only. The reason is that it works like transportable tablespaces (except that it can…

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Franck Pachot

RAC Attack! was another great success at C15LV

By | Operation systems, Oracle | No Comments

By Franck Pachot . The RAC Attack  – install a RAC in your own laptop – is a great success at Las Vegas. The idea is to help people follow the RAC Attack cookbook which is available at: http://en.wikibooks.org/wiki/RAC_Attack_-_Oracle_Cluster_Database_at_Home/RAC_Attack_12c/Hardware_Requirements It is a complex configuration and there is always problems to troubleshoot: get Virtual Box be able to run a 64-bits guest, and that might involve some BIOS settings be able to install VirtualBox, and we…

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Franck Pachot

Dbvisit replicate REDO_READ_METHOD

By | Database management, Oracle | No Comments

By Franck Pachot . A frequent question about replication is the overhead in the source, because in a lot of cases the source is production. Dbvisit replicate comes with the possibility to do the minimum on the source: only the FETCHER process is there to read de redo logs and sends it to the MINE process wich can be on another server. But maybe even that – reading those critical online redo logs – is…

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Franck Pachot

DataGuard wait events have changed in 12c

By | Database management, Oracle | 7 Comments

By Franck Pachot . There are several new features in 12c about Data Guard: cascaded standby, far sync instance. But there are also some architecture changes: new processes and new wait events. Here is an example of an AWR report of a LogXptMode=’SYNC’ DataGuard configuration in 11g – which means that the log_archive_dest is defined with: ‘LGWR SYNC AFFIRM’ That report comes from a period of time where the primary database was stuck because the…

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Matthieu Munch

QlikSense – The easy way to create a QlikView report

By | Entreprise content management | No Comments

Today, one of the most used Business Intelligence products is undoubtedly QlikView. This Swedish product is one of the best positioned in the Gartner Magic Quadrant for Business Intelligence and Analytics Platforms matrix and has been for a number of years. To make Business Intelligence even more accessible to Business users, the Qlik Company decided to add an additional product in its range. This product should be more accessible and easier to use to create…

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Franck Pachot

Oracle tuning silver bullet: add an order by to make your query faster

By | Database management, Oracle | 11 Comments

By Franck Pachot . You have read all Cary Millsap work about Oracle database performance tuning. You know that there are no silver bullets. Reducing the response time requires a methodical approach in order to analyze the response time with the goal of eliminating all unnecessary work. But I’ll show something completly opposite here. A performance tuning silver bullet. Do more work in order to run it faster: just add an ORDER BY to your…

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Microsoft Team

Weird issue with sys.fn_hadr_backup_is_preferred_replica() function

By | Hardware & Storage | No Comments

A couple of days ago, I faced a weird backup issue with SQL Server AlwaysOn and availability groups at one of my customer (thank to him to point out this issue 🙂 ). After installing our DMK tool (Database Management Kit) about database maintenance for AlwaysOn, my customer noticed that their databases have not backed up. Ouch … what’s going on? I never ran into this issue before… Do the problem comes from our tool?…

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Microsoft Team

Windows Cluster vNext and cloud witness

By | Operation systems | No Comments

The next version of Windows will provide some interesting features about WFSC architectures. One of them is the new quorum type: “Node majority and cloud witness” which will solve many cases where a third datacenter is mandatory and missing to achieve a truly resilient quorum. Let’s imagine the following scenario that may concern the implementation of either an SQL Server availability group or a SQL Server FCI. Let’s say you have to implement a geo-cluster…

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Franck Pachot

Index on SUBSTR(string,1,n) – do you still need old index?

By | Database management, Oracle | No Comments

By Franck Pachot . In a previous post I’ve shown that from 12.1.0.2 when you have an index on trunc(date) you don’t need additional index. If you need the column with full precision, then you can add it to the index on trunc(). A comment from Rainer Stenzel asked if that optimization is available for other functions. And Mohamed Houri has linked to his post where he shows that it’s the same with a trunc()…

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Nicolas Jardot

AOUG – Real World Performance Tour

By | Database management | No Comments

This week, Tom Kyte, Graham Wood and Andrew Holdsworth were present in Europe for several dates. One of the events was organised by the Austrian Oracle User Group (AOUG) in collaboration with the German and Swiss User Group (DOAG and SOUG) and I had the chance to be there to attend to one session of the Real Worl Performance tour session in Vienna. I think there is no real need to present the Real World…

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Franck Pachot

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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