Oracle

Restoring a database without having any controlfile backup

It should never happen but sometimes it happens. You just lost your datafiles as well as your fast recovery area (probably because most of the time these areas are on the same disks despite the recommendations). Normal restore operations with(…)

A tribute to Natural Join

By Franck Pachot . I know that lot of people are against the ANSI join syntax in Oracle. And this goes beyond the limits when talking about NATURAL JOIN. But I like them and use them quite often. Why(…)

Running PLSQL as SYSDBA through DEFINER-rights?

Recently I got an interesting request: The customer wanted to allow the application installation routine to create a guaranteed restore point without giving it all required privileges to do so. So the idea was to encapsulate creating and dropping a(…)

The size of Oracle Home: from 9GB to 600MB

By Franck Pachot . This is research only and totally unsupported. When building docker images to run Oracle Database in a container, we try to get the smallest image possible. One way is to remove some subdirectories that we know(…)

Easily manage dual backup destination with RMAN

Backup on disk with RMAN is great. It’s fast, you can set as many channels as your platform can handle for faster backups. And you can restore as fast as you can read and write files on disk with these(…)

ODA database been stuck in deleting status

Facing an internal inconsistency in the ODA derby database is very painful (see https://www.dbi-services.com/blog/oda-lite-what-is-this-odacli-repository/ for more info about the derby database). I have recently faced a case where the database deletion was failing and the database remained then in "Deleting"(…)

18c runInstaller -silent

By Franck Pachot . You find two different 'runInstaller' under an Oracle Home. The old one, the Oracle Universal Installer, in $ORACLE_HOME/oui/bin. And the new one, in $ORACLE_HOME directly. They have the same name but are completely different. The old(…)

TRANSPORT_CONNECT_TIMEOUT and RETRY_COUNT

By Franck Pachot . When you have a Data Guard configuration, you want the application to connect to the right server, where the primary is, without taking too much time. The default TCP timeout is 1 minute which is too(…)

ATP vs ADW – the Autonomous Database lockdown profiles

By Franck Pachot . The Oracle database has always distinguished two types of workloads: transactional (OLTP) and datawarehouse (VLDB, DWH, DSS, BI, analytics). There is the same idea in the managed Oracle Cloud with two autonomous database services.

MERGE JOIN CARTESIAN: a join method or a join type?

By Franck Pachot . I'll present about join methods at POUG and DOAG. I'll show how the different join methods work in order to better understand them. The idea is to show Nested Loops, Hash Join, Sort Merge Join, Merge(…)