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Database Certification

Most common questions asked about database certification:
1. Whats the next patchset level
2. When is the next release
3. When will the next release for OS. etc

Answer to all these questions lies in a metalink(now Oracle Support Portal) document 161818.1 Oracle Server (RDBMS) Releases Support Status Summary which is published external so anybody who has access to Oracle Support Portal can access this.

This document talks about Current Patchset for each version of Oracle database and the next inline for release. This document also contains information about extended maintenance support(EMS).

Document 161818.1 points to Document 742060.1 Release Schedule of Current Database Releases, which contains information about release schedule for current releases be it patchset or a version release.

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SQL Interview Questions on Subqueries

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Linux-x86_64 Error: 28: No space left on device


This as you can see is on Linux x86 with 64 bit processor. We got this error after we changed SGA on 10gR2 database. So was sure that this is something to do with the OS.

Parameters to check for this are shmall.

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$cat /proc/sys/kernel/shmmax
53687091200

$ getconf PAGE_SIZE
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As per Oracle SHMALL should be set to the total amount of physical RAM divided by page size.

Our system has 64GB memory, so change kernel.shmall = 1024 * 1024 * 1024 * 64 / 4096 = 16777216


Once this value is calculated you can modify Linux system configuration file directly.

$ su - root
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