RMAN PITR recover table Oracle 12c
At one client’s site, I had to restore a table someone had partially deleted one week before. Before Oracle 12c, we had to duplicate the target database to another server, and then to export and import...
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Configure AFD with Grid Infrastructure software (SIHA & CRS) from very...
Introduction : Oracle ASM Filter Driver (Oracle ASMFD) simplifies the configuration and management of disk devices by eliminating the need to rebind disk devices used with Oracle ASM each time the...
View ArticleControl File issues on duplicating with non patched Oracle version.
Introduction : RMAN has the ability to duplicate, or clone, a database from a backup or from an active database. It is possible to create a duplicate database on a remote server with the same file...
View ArticleSQL Plan stability in 11G using stored outlines
A stored outline is a collection of hints associated with a specific SQL statement that allows a standard execution plan to be maintained, regardless of changes in the system environment or associated...
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How to migrate Grid Infrastructure from release 12c to release 18c
Oracle Clusterware 18c builds on this innovative technology by further enhancing support for larger multi-cluster environments and improving the overall ease of use. Oracle Clusterware is leveraged in...
View ArticleRecover a corrupted datafile in your DataGuard environment 11G/12C.
On a DG environment, a datafile needs to be recovered on the STANDBY site, in two situations : when is deleted or corrupted. Below, I will explain how to recover a corrupted datafile, in order to be...
View ArticleCreate a primary database using the backup of a standby database on 12cR2
The scope of this blog will be to show how to create a primary role database based on a backup of a standby database on 12cR2. Step1: We are assuming that an auxiliary instance has been created and...
View ArticleWhen you change the UNDO_RETENTION parameter, the LOB segment’s retention...
Below, I will try to explain, a particular case for the general error : ORA-01555 snapshot too old error.. Normally, when we have this error, we are trying to adapt the retention parameters or to tune...
View ArticleMultitenant, PDB, ‘save state’, services and standby databases
By Franck Pachot . Creating – and using – your own services has always been the recommendation. You can connect to a database without a service name, though the instance SID, but this is not what you...
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One command database upgrade on ODA
The 12.2 finally arrived on ODA and is now available on all generations. Modern ODAs are now supporting 11.2.0.4, 12.1.0.2 and 12.2.0.1 database engines, and these 3 versions can work together without...
View ArticleDatabase Vault : Rules, Rule Sets and Command Rules
In a previous blog I talked about protecting data using Realms. With Database Vault we can also protect our database against some SQL statements. These statements can include SELECT, ALTER SYSTEM,...
View ArticleMigrating Oracle database from windows to ODA
Nowadays I have been working on an interesting customer project where I had to migrate windows oracle standard databases to ODA. The ODAs are X7-2M Models, running version 18.5. This version is coming...
View ArticleOracle 12c – pre-built join index
By Franck Pachot . This post is part of a series of small examples of recent features. I’m running this in the Oracle 20c preview in the Oracle Cloud. I have created a few tables in the previous post...
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Oracle 12c – peak detection with MATCH_RECOGNIZE
By Franck Pachot . This post is part of a series of small examples of recent features. I’m running this in the Oracle 20c preview in the Oracle Cloud. I’ll show a very basic example of “Row Pattern...
View ArticleOracle 12c – reorg and split table with clustering
By Franck Pachot . In this series of small examples on recent features, I have imported in a previous post, the statistics of covid-19 per day and per countries. This is typical of data that comes as a...
View ArticleOracle 12c – global partial index
By Franck Pachot . We have an incredible number of possibilities with Oracle. Yes, an index can be global (indexing many partitions without having to be partitioned itself on the same key) and partial...
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No{Join,GroupBy}SQL – Analytic Views for BI
By Franck Pachot . Advocates of NoSQL can query their structures without having to read a data model first. And without writing long table join clauses. They store and query a hierarchical structure...
View ArticleOracle non-linguistic varchar2 columns to order by without sorting
By Franck Pachot . Sorting data is an expensive operation and many queries declare an ORDER BY. To avoid the sort operation you can build an index as it maintains a sorted structure. This helps with...
View ArticleDuplicate Database on ODA X4
The ODA X4 is still in use for some customers. The last time I was asked to validate the backups . Let me explain the context. Actually the backups are done via RMAN on local in a NFS share. After...
View ArticleUpgrade to Oracle 19c – performance issue
In this blog I want to introduce you to a workaround for a performance issue which randomly appeared during the upgrades of several Oracle 12c databases to 19c I performed for a financial services...
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