Database management

SQL Server on Linux – I/O internal thoughts

Let’s start the story from the beginning with some funny testing I tried to perform with SQL Server on Linux a couple of months ago. At that time, I wanted to get some pictures of syscalls from SQL Server as(…)

DataGuard and Transparent Data Encryption

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(…)

How to fix your own SQL plan in Oracle ?

Method to build and fix your own SQL plans in Oracle and then you want to fix it for all next executions of the SQL by your application (thanks to SPM). In this post I show how fix a plan(…)

sqlplus and its column output

During tuning or normal DBA activities one of the most annoying things is sqlplus with its default column output when running queries. I.e. even after setting a linesize of 1000 and a pagesize of 1000 the output may look as(…)

PostgreSQL – logical replication with pglogical

Although PostgreSQL 10 integrate native logical replication (have a look here or here), it is always interesting to be aware of alternative solutions to the available in-core features. One of those is called(…)

Connect-times to the DB suddenly become very slow using sqlcl

I recently wrote a couple of sql-scripts which had to run on all of my customer’s DBs. The sql-scripts had to be started from a Linux-client, which does not have any Oracle client software installed. So I thought of using(…)

Migrate Oracle Database(s) and ASM diskgroups from VMWARE to Oracle VM

This is a step by step demonstration on how to migrate any ASM disk groups from a cluster to another. May be use, with or without virtualization and may be used with storage layer snapshot for fast environment provisioning. Step(…)

CPUs: Cores versus Threads on an Oracle Server

When doing a performance review I often do talk with the DBA about the CPU utilization of the server. How reliable is the server CPU utilization with tools like top or the host CPU utilization in the AWR-report? E.g. on(…)

RMAN debugging during catalog import

In this post I would like to share how I have been able to troubleshoot and solve a catalog import issue using RMAN debug function. As we can see, the error message provided by RMAN is not very helpful. oracle@vmtestoradg1:/home/oracle/(…)

ORACLE 11g to 12c RMAN catalog migration

This is a small migration demo of a 11g catalog (RCAT11G) to a new 12c catalog (RCAT12c). Demo databases environments have been easily managed thanks to DBI DMK tool. oracle@vmreforadg01:/home/oracle/ [RCAT11G] sqh SQL*Plus:(…)