Oracle ACE Associate
Today short post, just to announce that I became Oracle ACE Associate! I’m happy to be recognised by the Community and would like to thank all the people I’ve met during my career, who positively influenced me (not only with technical and Oracle knowledge!) and…
ExaCC: what to do if dbaas_diag_tool.pl fails
When you open Service Request related to problems on your Exadata Cloud at Customer (or other Oracle Cloud environments), very often you’ll be asked to upload diagnostic data, which can be easily gathered by running /var/opt/oracle/misc/dbaas_diag_tool.pl. If it works… In my case it failed, with…
Oracle Privilege Analysis in action
As Oracle has quite recently announced that Privilege Analysis is now included with the Oracle Database Enterprise Edition licence, I played a little bit with this cool feature to solve infamous ORA-01031: Insufficient privileges error. You can read results of my investigation in the article…
Cross-endian Oracle migration – moving user data – part II
In my previous post I shared some findings on migrating user and application data between platforms with different endianness, focusing on problems with reducing downtime. Today I’ll talk more about the complexity of chosen method. It’s not only about complexity per se, it’s rather about…
Cross-endian Oracle migration – moving user data – part I
One can find a lot of sources and materials regarding migrating Oracle databases between platforms having different endianness, even though the choice of possible methods is limited in this case. On paper (slides?) everything looks fine, but then you hit bugs or environment-specific problems. Moreover,…
Troubleshooting Oracle session disconnection slowness
I have been recently asked to investigate very interesting issue. In short: AIX 7.1 with Oracle 12.1.0.2. Connect with SQL*Plus from hostX to databaseA running on hostZ, then disconnect – was hanging for around 75 seconds. Connect with SQL*Plus from hostY to databaseA running on…
Fast Recovery Area space usage threshold
Using Fast Recovery Area to let Oracle automatically manage the backup/flashback/recovery related files is very useful, but avoiding problems related with FRA free space shortage requires careful planning. There are several factors that have to be taken into account, apart from the most obvious like…
Redo Transport from Oracle 11.2 to 12.2 and SYS password case-sensitivity problems
Case-sensitive passwords were introduced in Oracle Database 11g, causing some misunderstanding and introducing quite a lot of annoying problems for DBAs, even though it was really required to bring level of Oracle’s security to 21st century standards ;). Since then, even more changes were introduced,…
Migrating from Windows to Linux with Active Duplicate for standby – problem with 11.2.0.4
Recently I was working on migrating Oracle 11.2.0.4 database running on Windows, to new hardware infrastructure on Linux. This Oracle version is with us for quite a long time, plus migration from Windows to Linux is quite common (fortunately in that direction…;)), so when I…
Bloom filters and parallel execution
Today I want to share with you another interesting example of solving performance problem which happened in the database used for Business Intelligence purposes. Users were complaining that the performance in kind of staging database (STGDB) was much better than the production one (PRDDB), even…
Social Media @trivadis