Database Administration & Monitoring

Character Sets and Oracle 21c PDBs : How It Works

By Mouhamadou Diaw When creating a database in a multitenant environment we must understand how character set works for CDB and PDBS. In Oracle documentation we can find following lines -When the character set of(…)

Import tnsnames.ora in LDAP directory

This post gives a short intro to directory naming, shows how to import from tnsnames.ora to an LDAP directory. Finally, as an alternative, you get an example how a TNS connection string looks like in ldif file format. LDIF can(…)

How to configure Linux Server to run Oracle Database 19c on Persistent Memory

Introduction to Persistent Memory In the last few years, storage media have become more and more advanced and faster. Today, SSD disks are almost standard as storage and if an Oracle database really has an I/O critical workload, nvme storage(…)

How to install a specific version of MariaDB

Recently, we had to upgrade a MariaDB server from version 10.5.4 to 10.5.13. Before to do the upgrade on a production server, I wanted to test it on a personal VM. But first, I had to find how to install(…)

PostgreSQL 15: New option for NULL handling in unique constraints

Another nice feature was just committed for PostgreSQL 15: Add UNIQUE null treatment option (discussion here, commit details here). What is it about? The answer is quite easy if we do a little example(…)

Updating Password in PostgreSQL from md5 to scram-sha-256

Many installations have a history of many major PostgreSQL releases. With PostgreSQL 10 comes scram-sha-256 for hashing passwords, by installing from packages scram-sha-256 is the default setting for new installations since PostgreSQL 13. With this small blog I will(…)

PostgreSQL 15: New function to list flags associated to GUCs

As development of PostgreSQL 15 is on its way, more and more features get committed. Today we'll look at a new feature which is not a hammer feature, but a nice thing to have and to know about. If you(…)

Oracle Partition and Performance of massive/concurrent Inserts

For a customer, I had to check if partitioning improves performance of massive and concurrent inserts. The goal is to execute several Inserts in parallel via dbms_parallel_execute package (my previous blog “parallelize your Oracle Insert with DBMS_PARALLEL_EXECUTE” explains how(…)

Clone Oracle 21c Home

By Mouhamadou Diaw When deploying new Oracle Home on the same server or on a new server, you may use the downloaded Oracle binaries and do an install from scratch as usual. You may then apply any patch you have(…)

Patching an IBM Db2 instance

The next task in my journey with DB2 is to apply a patch. In the world of DB2 there are Modification Packs and Fix packs. As far as I understand it, Modifications Packs come with new features,(…)