Oracle Database as our consultants live it every day: installation and patching, upgrades, RMAN backup and recovery, Data Guard, RAC, performance tuning, multitenant, licensing, and engineered systems such as ODA and Exadata.
By Franck Pachot . This month, I’ll talk – with lot of demos – about multitenant internals at DOAG conference. The multitenant dictionary architecture starts with a simple idea: system metadata and data are in CDB$ROOT and user metadata and data are in PDB. And it could have been that simple. When a session connected to a PDB needs to…
By Franck Pachot . The documentation says that for Reduction of duplication and Ease of database upgrade the Oracle-supplied objects such as data dictionary table definitions and PL/SQL packages are represented only in the root. Unfortunately, this is only partly true. System PL/SQL packages are only in root but system table definition are replicated into all PDBs. This post is…
By Franck Pachot . AWR collects segment statistics, and this can be used to quickly understand an abnormal database growth. Here is a script I use to get, from the AWR history, the segments that have grown by more than 1% of the database size, in one hour. First I must mention that this uses only the part of AWR…
By Franck Pachot . Here is a quick SQL Developer report which display a chart about the Dbvisit replicate lag over the last hours The idea is to have the following chart showing the lag in MINE and APPLY processes. Here is an example where I stopped the replication to show some lag. The query is on the DBVREP.DBRSCOMMON_LAG_STATS on…
By Franck Pachot . Here is a small warning. In Standard Edition, you may expect that the features that are not available for your edition are blocked, but in 12.2 you can create more than one PDB in Standard Edition, and you should set MAX_PDBS to prevent that. 12cR1 In 12.1 Standard Edition, when you try to create more than…
By Franck Pachot . The development teams often see the database as a ‘persistence layer’ only. And sometimes it is mentioned that the database is always the cause of the problems, especially when implementing continuous integration and trying to be agile. Then cames the idea to have this ‘persistence layer’ in an isolated environment, such as a docker container, with…
By Franck Pachot . The deletion policy on a dataguard configuration should be: CONFIGURE ARCHIVELOG DELETION POLICY TO APPLIED ON ALL STANDBY; for the site where you don’t backup. It can be the standby or the primary. and: CONFIGURE ARCHIVELOG DELETION POLICY TO APPLIED ON ALL STANDBY BACKED UP 1 TIMES TO DISK; for the site where you do the…
In this blog post, we will see how to manage Oracle Public Cloud Big Data service Compute Edition with REST API. Scheduling the start/stop/restart of a metered PaaS in the Oracle Cloud can be interesting for managing efficiently the consumption of your cloud credits. We should first have a look at the official documentation so as to understand what the API is composed…
By Franck Pachot . My ODC appreciation blog post was about Javascript in the database running in the beta of the Oracle Database Multilingual Engine (MLE). Here I’ll detail my first test which is a comparison, in performance, between a package written in Javascript, running in the MLE, and one written and running in PL/SQL. I’ve downloaded the 12GB .ova…
By Franck Pachot . Tim Hall has launched the idea to post small blogs this day, from all the Oracle community, about an Oracle feature. I choose one feature that is only released in beta test for the moment: the Multilingual Engine (MLE) which is able to run Javascript stored procedures in the database. Why? When I first heard about…
By Franck Pachot . Larry Ellison has announced Oracle 18c to be the Autonomous Database, the no-human labor, and self-driven, database. Here is a quick recap of what it is behind the marketing words. My opinion only. Autonomous Since Oracle decided to be a public cloud PaaS provider, they announced ‘unmanaged’ and ‘managed’ services. The managed service for DBaaS is…
By Franck Pachot . ODA X6-2 So, the ODA X6 End of Life seems to be planned for October, and be careful, as far as I know, this concerns also the storage expansion. The main feedback from the X6-2 series were: not enough cores when consolidating multiple databases in M, L and HA not enough storage on HA when compared…
