Diagnosing and Resolving “gc block lost”

Last week, one of our clients had a sudden slow down on all of their applications which is running on two node RAC environment

Below is the summary of the setup:
- Server and Storage: SunFire X4200 with LUNs on EMC CX300
- OS: RHEL 4.3 ES
- Oracle 10.2.0.3 (database and clusterware)
- Database Files, Flash Recovery Area, OCR, and Voting disk are located on OCFS2 filesystems
- Application: Forms and Reports (6i and also lower)

As per the DBA, the workload on the database was normal and there were no changes on the RAC (more...)

OS Thread Startup

Recently I encountered a performance problem scenario where a simple sqlplus “/ as sysdba” took about 2minutes to finish, this is critical to the client’s business because they have a local C program that loads Call Detail Reports on the database making use of local authentication for most of its operations and Sql*Loader to load the data, so this “2minutes of waiting” when accumulated greatly consumes significant time on their operations and greatly impacts the business.

When I arrived on the client I first checked the alert logs of both ASM (they have a separate home for ASM) and RDBMS, (more...)

The trains are a nightmare, IT’s a Miracle and how little can you know…: Tanel Põder in Utrecht!

Uncategorized
| Apr 2, 2009

 

Networking and evaluations
Networking and evaluations

Today was the first day of the second Miracle Masterclass this year: Tanel Põder has come to The Netherlands, saw a room filled with a lot of people (he called it the best seminar even before he started, just because of the amount of attendants) and made me feel I have an awful lot to explore yet. However, that is in fact a good thing and it made me get through the “trains nightmare” today with a smile: I had trouble in the morning since I left home far too late, had to cycle as fast as I (more...)