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Event Sourcing: CQN is not a replacement for CDC
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...
View Article18c: some optimization about redo size
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...
View Article18c: Order by in WITH clause is not preserved
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...
View ArticleData Guard: always set db_create_file_dest on the standby
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...
View ArticleRestarting a failed transportable tablespace metadata import
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...
View ArticleRelease 18.0.0.0.0 Version 18.3.0.0.0 On-Premises binaries
Good news, the latest Patchset for Oracle 12cR2 (which is not named patchset anymore, is actually called release 18c and numbered 18.0.0.0.0) is available for download on OTN. It is great because OTN...
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ODA, network interface and configure-firstnet
Deploying new ODA X7-2S or 2M, I have been curious how configure-firstnet would interact with the fiber and copper ethernet network interfaces. Reading documentation on the web, I could not clearly...
View ArticlePatching 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...
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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...
View ArticleHow much free space can be reclaimed from a segment?
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 space...
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MERGE JOIN CARTESIAN: a join method or a join type?
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...
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ATP vs ADW – the Autonomous Database lockdown profiles
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...
View ArticleTRANSPORT_CONNECT_TIMEOUT and RETRY_COUNT
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...
View ArticleORACLE_HOME with symbolic link and postupgrade_fixups
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...
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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...
View ArticleODA database been stuck in deleting status
Facing an internal inconsistency in the ODA derby database is very painful (see https://blog.dbi-services.com/oda-lite-what-is-this-odacli-repository/ for more info about the derby database). I have...
View ArticleEasily 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...
View ArticleThe size of Oracle Home: from 9GB to 600MB
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...
View ArticleRunning 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...
View ArticleA 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...
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