Oracle

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"(…)

Licensable targets and Management Packs with EM13c

When you add a new target in Enterprise Manager 13c , the management packs are enabled by default. This could be a problem in case of a LMS control, and to avoid any problem, you have to  manually disable those(…)

ORACLE_HOME with symbolic link and postupgrade_fixups

By Franck Pachot . Here is a quick post you may google into if you got the following error when running postupgrade_fixups.sql after an upgrade: ERROR - Cannot open the preupgrade_messages.properties file from the directory object preupgrade_dir DECLARE * ERROR(…)

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(…)

How much free space can be reclaimed from a segment?

By Franck Pachot . You have the feeling that your table takes more blocks than it should? Here are the queries I use to quickly check the free space. The idea is to call DBMS_SPACE.SPACE_USAGE and infer the minimum(…)

Oracle 18c preinstall RPM on RedHat RHEL

By Franck Pachot . The Linux prerequisites for Oracle Database are all documented but using the pre-install rpm makes all things easier. Before 18c, this was easy on Oracle Enterprise Linux (OEL) but not so easy on RedHat (RHEL) where(…)

Patching ODA lite to 12.2.1.4.0

Here is how to apply the latest patch for your ODA. As usual the Oracle documentation is not 100% accurate. I applied this patch on 2 ODAs X7-2M previously deployed in 12.2.1.2.0, no intermediate patch was needed. 1) Download the(…)