Everything our consultants learn while running databases for customers: Oracle, PostgreSQL, SQL Server, MySQL, MariaDB, MongoDB and Delphix. Expect hands-on posts about installation, day-to-day administration, backup and recovery, performance tuning, replication and upgrades.
By Mouhamadou Diaw Dbvisit snapshot option is a new feature available starting from version 9.0.06. I have tested this option and in this blog I am describing the tasks I have done. The configuration I am using is following dbvist1 : primary server dbvist 2 : standby server orcl : oracle 19c database We suppose that the dbvisit environment is…
ARRAYSIZE or ROWPREFETCH in sqlplus? What is the difference between the well known sqlplus-setting arraysize and the new sqlplus-12.2.-feature rowprefetch? In Blog https://www.dbi-services.com/blog/oracle-fasttrue-in-sqlplus-some-thoughts-about-rowprefetch/ I showed a case, which helps to reduce the logical IOs when using rowprefetch. Here the definition of arraysize and rowprefetch according the documentation: arraysize: SET System Variable Summary: Sets the number of rows, called a batch,…
During my time as a Consultant working on Tuning Tasks I had the feeling that many people think that there is an Oracle-parameter “FAST=TRUE” to speed up the performance and throughput of the database calls. Unfortunately such a parameter is not available, but since version 12cR2 Oracle provided the option “-F” or “-FAST” for sqlplus, which looks like a “FAST=TRUE”-setting.…
At a customer we implemented the EDB Postgres Enterprise Manager. As they run multiple PostgreSQL cluster on one server, they wanted, for sure, to monitor all the cluster using PEM. This blog should give you a short guidance on how to add databases to PEM. Starting position – PEM Server installed, up and running – PEM Agent installed on the…
Introduction Following the basic configuration explained in a previous blog (Link), I describe here how to make more advanced configurations in some specific cases but often met by customers. It is only complementing what has being described in the previous blog in some specific situations needing additional or alternative configurations Configuration using HTTPS protocol with DNS alias If you are…
The Documentum installation owner is the operating system user that owns the server executable and other related files along with the OS process when the server is running. It is originally determined when the server is installed, in fact, it is the logged-in user that performed the Documentum installation. Of course, it is preferable to install Documentum and never change…
Introduction Sometimes you face interesting challenges with unusual environment. One of my customer needed a automated and flexible backup solution. Said like that nothing very complex you will say. But if I mention that some databases were 60TB big with more than 30 filegroups and around 600 database data files each and moreover synchronized in an AlwayOn availability group, it…
Introduction Even if upgrading your Power BI Report Server is straight forward, I have been asked many times where to find the installation files and how to run it that I thought a blog is worth it. Before you start Before upgrading your Power BI Report Server it is recommended to perform some backup steps. Back up the encryption keys…
I’ve done quite some real time logical replication projects in the past, either using Oracle Golden Gate or EDB replication server. Build in logical replication in PostgreSQL (which is available since PostgreSQL 10) can be used as well when both, the source and the target are PostgreSQL instances. While being at the DOAG conference and exhibition 2019 I got in…
Introduction For years, Oracle used the same mechanism for database versioning. A major version, represented by the first number. And then a release number, 1 for the very first edition, and a mature and reliable release 2 for production databases. Both of them having patchsets (the last number) and regular patchset updates (the date optionally displayed at the end) to…
When applying archive logs on the standby, dbvctl process can terminate abnormally with Error Code: 2044. This can happen in case there are several archive logs with huge size to be applied. Problem description With dbvisit there is 2 ways to recover the archive log on the standby, either using sqlplus or rman. By default the configuration is set to…
Oracle Database Appliance (ODA) is by default configured with software raid for Operating System and Oracle Database software file system (2 internal SSD disks). 2 raid devices are configured : md0 and md1.ODA are configured to run raid-check every Sunday at 1am. Analysing the problem In case the ODA is having some load during raid-check, it can happen that the…
