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Jérôme Dubar

Statspack with Oracle Database 19c and Multitenant

By | Database Administration & Monitoring, Database management, Development & Performance, Oracle | No Comments

Introduction When it comes to performance analysis on Oracle databases, everybody think about Diagnostic Pack. This is a very complete tool and it brings much more metrics than a DBA can analyze. But there is a big drawback with this tool: it’s not included in Standard Edition and it’s an option with Enterprise Edition. If you don’t have this tool, it’s still possible to do performance analysis using older Statspack tool. Statspack is nothing else…

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Jérôme Dubar

Move a PDB from a server to another one using NFS

By | Database Administration & Monitoring, Database management, Oracle | No Comments

Introduction Multitenant brings new possibilities regarding Oracle databases, and one of them is to move a database from a container to another quite easily. When containers are on the same server, it’s very easy, but when the containers are on different servers, you will need to use a database link or an RMAN restore. But there is also another solution if you don’t want to use the previous ones: using a NFS volume. Test lab…

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Jérôme Dubar

Get prepared to move your Oracle databases to OCI

By | Cloud, Database Administration & Monitoring, Database management, Oracle | No Comments

Introduction Cloud often raises in the top 3 solutions when thinking about Oracle infrastructure renewal. For obvious reasons: you do not need to buy any server, platform is already available, you pay as a subscription, you drastically reduce time to go to production and you can scale up and down. Oracle Cloud Infrastructure, or OCI, is a Cloud provider you should consider if you’re using Oracle databases. But what do you need to plan before…

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Oracle Team

Amazon RDS Oracle in Multitenant

By | AWS, Oracle | 2 Comments

By Franck Pachot . AWS has just added the possibility to create your oracle Database as as CDB (Container Database), the “new” architecture of Oracle where an instance can manage multiple databases, adding a new level between the heavy instance and lightweight schema: At the time I’m writing this, I see it only in the “old” console (“original interface”) not in “new database creation flow”. It is displayed as a different Edition, however it is…

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Jérôme Dubar

Is it possible to switch a service between 2 pluggable databases?

By | Database Administration & Monitoring, Database management, Oracle | No Comments

Introduction In an Oracle database, services have multiple purposes: identifying group of users prior authenticating them enabling/disabling access to a database for particular groups managing preferred nodes on a RAC configuration redirecting users to the primary after a switchover/failover when using Data Guard or Dbvisit Standby redirecting read only connections to Standby database with Active Guard option A customer asked me if services could be used for switching between PDBs without modifying client’s connexion, for…

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Oracle Team

Oracle ACFS: “du” vs. “df” and “acfsutil info”

By | Oracle | 2 Comments

By Franck Pachot . This is a demo about Oracle ACFS snapshots, and how to understand the used and free space, as displayed by “df”, when there are modifications in the base parent or the snapshot children. The important concept to understand is that, when you take a snapshot, any modification to the child or parent will [[email protected] ~]$ asmcmd lsdg DATAC1 State Type Rebal Sector Logical_Sector Block AU Total_MB Free_MB Req_mir_free_MB Usable_file_MB Offline_disks Voting_files…

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Open source Team

Some myths about PostgreSQL vs. Oracle

By | Oracle, Postgres | One Comment

By Franck Pachot . I originally wrote this as a comment on the following post that you may find on internet: https://www.2ndquadrant.com/en/blog/oracle-to-postgresql-reasons-to-migrate/ but my comment was not published (many links in it… I suppose it has been flagged as spam?) so I put it there. You should never take any decision on what you read on the internet without verifying. It is totally valid to consider a move to Open Source databases, but doing it…

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Oracle Team

What is a serverless database?

By | AWS, Cloud, Database Administration & Monitoring, Oracle | No Comments

By Franck Pachot . After reading the https://cloudwars.co/oracle/oracle-deal-8×8-larry-ellison-picks-amazons-pocket-again/ paper, I am writing some thoughts about how a database can be serverless and elastic. Of course, a database needs a server to process its data. Serverless doesn’t mean that there are no servers. Serverless as not waiting for server provisioning The first idea of “serverless” is about provisioning. In the past when a developer required a new database to start a new project she had to…

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Clemens Bleile

Functions in SQL with the Multitenant Containers Clause

By | Oracle | No Comments

By Clemens Bleile To prepare a presentation about Multitenant Tuning I wanted to see the METHOD_OPT dbms_stats global preference of all my pluggable DBs. In this specific case I had 3 PBDs called pdb1, pdb2 and pdb3 in my CDB. For testing purposes I changed the global preference in pdb1 from its default ‘FOR ALL COLUMNS SIZE AUTO’ to ‘FOR ALL INDEXED COLUMNS SIZE AUTO’: c##[email protected]@PDB1> exec dbms_stats.set_global_prefs(‘METHOD_OPT’,’FOR ALL INDEXED COLUMNS SIZE AUTO’); c##[email protected]@PDB1> select…

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Oracle Team

Oracle disables your multitenant option when you run on EC2

By | Cloud, Oracle | 13 Comments

I have installed Oracle 19.6 on an EC2 for our Multitenant Workshop training. And of course, during the workshop we create a lot of PDBs. If you don’t have paid for the Enterprise Edition plus the Multitenant Option you can create at most 3 pluggable database. But with this option you can create up to 252 pluggable databases. Does it worth the price, which according to the public price list is USD 47,500 + 17,500…

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