September 12 2010

shmget: [EEXIST][17]: key 52b14804: shared memory already exists.

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I was getting error “shmget: [EEXIST][17]: key 52b14804: shared memory already exists” in online log and I notice OS physical memory and kernel parameters (shmmax) have much more available memory. But Informix instance unable to allocate new shared memory virtual segment during run-time from OS kernel. I notice there is no AF file (Assert Failed) generated.

I have raised a case to IBM Informix and confirm it was encountering IDS bug with product defect number  idsdb00206627.

August 04 2010

Does Oracle 11gR2 run on HP-UX 11.11 & 11.23?

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Does Oracle 11gR2 run on HP-UX 11.11 & 11.23? The answer is No for both type processors – PA-RISC and Itanium (ia64).

The 11g certification on HP-UX are as follow:

Oracle 11g R2 (11.2):

HP-UX 11.31 (ia64 Itanium & PA-RISC)

Oracle 11g R1 (11.1):

HP-UX 11.23 (ia64 Itanium & PA-RISC)
HP-UX 11.31 (ia64 Itanium & PA-RISC)

July 28 2010

CRS-2640: Required resource ‘ora.ARC2_DG.dg’ is missing.

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PRCR-1079 : Failed to start resource ora.mydb.db
CRS-2640: Required resource ‘ora.ARC2_DG.dg’ is missing.
How to remove the ASM resource from CRS start/stop dependency?

Applies to:

Oracle 11gR2 RAC

Scenario:

(2 node RAC with 11gR2 in RHEL 5.3 x86_64)

I was having 2 ASM diskgroup (ARC1_DG & ARC2_DG) assigned for archive logs and standby Dataguard when first RAC .

Due to some reason that management want to merge these 2 diskgroups into one (ARC1_DG).

I confimed that ARC2_DG was not contain any file and diskgroup ARC2_DG dropped successfully.