The gap The story started with an always-unpleasant alert log message: The reason Looking into v$archived_log: The log sequences 2306-2405 ARE applied on standby. And thus deleted by policy from the Fast Recovery Area. Okay, this explains the effect, but not the root cause. So we had to open a SR with Oracle Support. The […]
DOAG Regionalgruppe Nürnberg Anfahrt / Map
DOAG Regio und Meetup Die DOAG Regionalgruppe und Meetup Nürnberg hat ein großes Thema: Die Technologien von und rund um Oracle, und ist ganz leicht zu finden. Sie ist immer am gleichen Ort, und das Treffen findet immer am dritten Donnerstag eines jeden Monats statt (außer August und November). Die konkreten Termine und Themen werden […]
Back again!
The blog was a bit neglected over the last time. But now, with a new face and a modern backend, I’m determined to use it again. 🙂 Thanks very much Valentin and Hendrik, who did an amazing job with renewing the infrastructure and the new theme! Stay tuned! Martin […]
Oracle ACE Director
Uh, there has been no blog entry for some time, had a busy time. So now I have a good reason to blog after returning from Collaborate18 in Las Vegas, where I had the chance to present two talks about SQL Tuning and Oracle Performance on VMware. The Oracle ACE Program usually hosts a dinner […]
Oracle: Create a Materialized View with Fast Refresh on commit and debug upcoming errors
Sometimes, our users and customers need rapid access to complex data structures. Materialized Views in their various forms are a very potent way to shift efforts from the query to insert/update time of base data. That’s the nature of a Materialized View: One way or another, we need to put the data into a redundant structure. With […]
Oracle on Windows: ASM instance terminated by LMON / ORA-27300 IPC_TCPConnectCheck failed with status -1
Recently I had an issue with a two-node Grid Infrastructure on Windows 2012R2. After an infrastructure-caused cluster restart (irresponsible SAN hardware patching 🙂 ), everything was running on Node 2, and Node 1 could not join the cluster any more. No easy solution: On CSSD level, there was no issue (network and disk heartbeat worked, […]
Oracle on SLES12 SP2 – Avoiding Cgroup Task Limit
Once upon a time, there was an Oracle RAC cluster 12.2.0.1 on SUSE Linux Enterprise Server (SLES) 12 SP2, that did not do well. Its database and ASM instances used to fail with: ORA-27300: OS system dependent operation:fork failed with status: 11 ORA-27301: OS failure message: Resource temporarily unavailable ORA-27302: failure occurred at: skgpspawn3 Of […]
Oracle 12.2 sysctl.conf Default Preinstall Settings
This are the currently active settings, the oracle-database-server-12cR2-preinstall.rpm delivers on Oracle Linux 7. Maybe it’s useful for you when setting up Oracle 12.2 on SUSE / SLES where you are on your own. Maybe you also want to add Huge Pages: # Performing Databases Huge Page Settings # for SGA size 200GB and huge page […]
Oracle RAC 12.2 on SLES12 – How to disable Hardware Lock Elision Support
The Problem In the last week, I had to set up an Oracle RAC (and thus, the Clusterware) version 12.2.0.1 on SuSE Linux Enterprise Server 12 SP2 (SLES12 Sp2). The gridSetup.sh failed latest in root.sh of the first node with a kinda non-intuitive error: CRS-5804: Communication error with agent process CRS-4000: Command Start failed, or […]
Oracle RAC 12.2 High Load on CPU from gdb when Node Missing
Recently I had to battle a new issue with the quite-new Oracle Database RAC Version 12.2.0.1 on Linux x86_64. The idea of RAC is, to compensate the loss of a node or service by restarting services on other nodes. But in my case, when one node in a two-node-Cluster was down (or the crs stack […]