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.
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 structure, or on a remote server with a different file structure or on the local server with a different file structure. For some old…
I’m currently working in a project to migrate a Datawarehouse-database from Solaris to Linux Intel (Endian-change). We do use the cross platform incremental backups method as described in My Oracle Support Note 1389592.1 for that. I.e. incremental backups are applied to database files and during the migration the recovered datafiles are attached to the target database via the transportable tablespace…
By Mouhamadou Diaw Database Vault can also be used in a multitenant environment. In a multitenant environment we must register Oracle Database Vault in the root first, then after in the PDBs. In this blog we will see how we can use realms to protect data in a pluggable database 12.1. In CDB$ROOT we have to create common accounts that…
By Franck Pachot . The file name convert parameters are not dynamic and require a restart of the instance. An enhancement request was filled in 2011. I mentioned recently on Twitter that it can be annoying with Active Data Guard when a file on the primary server is created on a path that has no file name conversion. However, Ian…
By Franck Pachot . When I did my first demo using tmux, I have written the following blog post to explain it: https://www.dbi-services.com/blog/using-tmux-for-semi-interactive-demos/. Since then I’ve done all my demos with this technique. My scripts and configuration files have evolved now I have uploaded the on GitHub to share them: https://github.com/FranckPachot/scripts/tree/master/tmux-demo The README.md explains the pre-requisites (a recent version of…
By Franck Pachot . For a previous post I’ve run on 18c a script of mine to get the V$MYSTAT delta values between two queries. This script (new version available on GitHub) generates the queries to store some values and subtract them on the next execution. But I had to fix it for 18c because I relied on some order…
Configuring fiber interfaces during an ODA installation can sometime been challenging. The configuration can depend on the kind of gigabit interface converter (GBIC) and switch been used. In this blog, I would like to show a real case faced during one of our customer deployment, and come with a solution. Problem We were facing link detection issue when using the…
By Franck Pachot . Some years ago, at the time of 12.1 release, I published in the SOUG newsletter some tests to show the amount of redo generated by different operations on a 10000 rows table. I had run it on 12.2 without seeing the differences and now on 18.1 I get the statistics from mystat using a script that…
By Franck Pachot . We are in an era where software architects want to stream the transactions out of the database and distribute them, as events, to multiple microservices. Don’t ask why, but that’s the trend: store inconsistent eventually consistent copies of data in different physical components, rather than simply using logical views in the same database, where the data…
By Franck Pachot . When Diagnostic Pack is disabled, either because you don’t have Diagnostic Pack or you are in Standard Edition, I highly recommend to install Statspack. When you will need it, to investigate on an issue that occured in the past, you will be happy to have it already installed and gathering snapshots. I order to be sure…
By Mouhamadou Diaw Setting up a DatagGard environment for a database with Transparent Data Encryption requires some tasks concerning the encryption keys. Otherwise the steps are the same than for an environment without TDE. In this blog we will present the tasks we have to do on both primary and standby servers for the keys. We will not describe the…
By Franck Pachot . For an Oracle DBA, we are used to join active sessions (from V$SESSION where status=’ACTIVE) with active statements (from V$SQL where users_executing>0) on the SQL_ID. V$ACTIVE_SESSION_HISTORY also displays the TOP_LEVEL_SQL_ID to get the entrypoint of the usercall if we need it. With Postgres it is a bit more difficult because it seems that PG_STAT_ACTIVITY do not…
