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.
Introduction While patching ODAs from 19.10 to 19.13, the update-dbhome could fail if some databases inside this dbhome are stopped or only mounted. Job would then stop with a DCS-10001:Internal error encountered: PRGH-1153 : RHPHelper call to get runing nodes failed for DB: “ARITSTDB”. How to solve this problem? Environment description My environment is composed of 3 X8-2M ODAs, 2…
By Mouhamadou Diaw In a previous blog , I talked about refreshable PDB technology which can be used to refresh a target PDB. We have seen here how the target refreshable PDB can be used as a master to provide PDB snapshots. In this blog we are going to continue in the same topic and talk about PDB Snapshot Carousel…
I am currently working on a customer project to create database clones using storage snapshots. The advantages are obvious, because using a storage snapshot as a clone not only saves space, but is also extremely fast compared to a full clone. This post is not about explaining in detail how to implement the snapshot clone technically, but it should point…
My last post about logical replication in PostgreSQL was in 2017 before PostgreSQL 10 was released later that year. There have been many enhancements to logical replication since then and today we’ll look at a new features that will probably come with PostgreSQL 15 later this year: Allow specifying row filters for logical replication of tables. What is it about?…
Introduction Oracle Database Appliance now fully supports virtualization with KVM, and this could be interesting for some of us. If you’re using Enterprise Edition, you probably decreased the number of cores to comply with your licenses. Now you can increase your core configuration with more cores, some being dedicated to your databases, and some for user-managed VMs. Let’s find out…
By Mouhamadou Diaw In a previous blog , I talked about refreshable PDB technology which can be used to refresh a target PDB. The target PDB can be in mounted state (mandatory to be refreshed) or can be opened in a read only mode. One application is to use the target refreshable PDB as a master to provide PDB snapshots.…
One question that comes often out working with Percona Monitoring and Management tool, is how to use LDAP to define users which can connect to the PMM web interface. Let’s see how to implement this kind of configuration. As you can read in a previous post where I gave an overview of PMM, the product is based on a client-server…
Would you like to quickly provide your engineering team with a real production environment database with updated data to develop new features? Does your operational team need a copy of the production database to test a new release or a new patch? “Easy” would you say. “Let’s do a clone and duplicate the production database with RMAN!”. Yes, but would…
I recently wrote a blog on how to separate database traffic on an ODA using KVM Database Systems on different VLAN : Creating KVM Database System on separate VLAN network on ODA As we could see there is pros and cons. Another way would be to have the database created on the Bare Metal itself and using listeners running on…
As part of a MSSQL consolidation project, with application servers located in one domain and the databases in another, we received an alert indicating that some databases were not available. After starting the investigation, we discovered that the Availability Group (AAG), to which these databases belong, was temporary taken in RESOLVING_NORMAL: The state of the local availability replica in availability…
This Blog describes the Migration from CentOS 8 to Rocky Linux 8. And hopefully there is a backup or VM Snapshot in place when something goes wrong. At first Updating CentOS 8 to the latest is required, but this is now not so easy, most Repositiory Mirrors are deprecated. As Preparation an adaptation of the CentOS Repo files is needed…
By Clemens Bleile Recently I upgraded an ODA X7-M from 19.12. to 19.13. After the dcs-, server- and storage-upgrade several databases on the machine had to be patched from 19.9. to 19.13. The [root@<node> ~]# odacli create-prepatchreport –dbhome –dbhomeid <home-id> -v 19.13.0.0.0 went through without reporting an issue, but during the [root@<node> ~]# odacli update-dhome -i <home-id> -v 19.13.0.0.0 -f…
