Oracle Database as our consultants live it every day: installation and patching, upgrades, RMAN backup and recovery, Data Guard, RAC, performance tuning, multitenant, licensing, and engineered systems such as ODA and Exadata.
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…
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…
By Mouhamadou Diaw A refreshable clone PDB is a way to refresh a single PDB instead of refreshing all PDBs in a container as in a Data Guard environment. It consists to make a clone of a source PDB and the clone PDB is updated with redo accumulated since the last redo log apply In this blog I did some…
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 the CDB root is AL32UTF8, PDBs that are plugged into the CDB can have a different character set from the CDB root. PDBs that you…
Oracle appliance is proposing various possibilities for creating databases either on the Bare Metal or using KVM DB System. Each DB System will host a single database in a separate VM. What about having each DB system running a separate network? In this blog I would like to share my tests and findings about how to create additional network on…
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 is often used. The latest evolution in database storage is persistent memory which improves latency and I/O throughput compared to…
The aim of that blog is to look into Oracle REST Data Services (ORDS) DB connection with TNS. This is following some experience at a customer who wanted to move to latest version of ORDS with APEX 21.2, in late 2021, and run into an issue. For general presentation about ORDS installation please see the blog of my colleague Lazhar…
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 to use dbms_parallel_execute). The idea is to insert more than 20 millions of rows in 2 tables : One table not…
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 on your actually Oracle Homes. This may take time. Oracle provides tools to clone an existing Oracle Home with all…
By Clemens Bleile From Oracle Database Appliance (ODA) version 19.11. onwards the ORACLE_HOMEs and ORACLE_BASE will be created on ACFS, i.e. take space from an ASM-diskgroup instead of taking filesystem space from /u01. See this blog concerning details. If the ODA has been upgraded from a release < 19.11. to 19.11. or newer, then you usually have diag- and admin-data…
By Mouhamadou Diaw In a previous blog , I was talking about virtual machines on ODA servers. Sometimes it comes that we want to add another network interface for other purpose. In this blog I am describing the main tasks to add a second network interface card on KVM virtual machine. Let’s describe the context I have an ODA X8-2M…
Introduction When it comes to performance analysis on Oracle databases, everybody think about Diagnostic Pack. This is a very complete tool and it brings much more metrics than a DBA can analyze. But there is a big drawback with this tool: it’s not included in Standard Edition and it’s an option with Enterprise Edition. If you don’t have this tool,…
