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Installing 12c (12.1.0.1) RAC on RHEL 6 with Role Seperation - Clusterware
Installing 12cR1 RAC without the use of the new features such as the Oracle Flex ASM is pretty much same as installing 11gR2 RAC with role separation. This post is not a step by step guide to...
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Installing 12c (12.1.0.1) RAC on RHEL 6 with Role Seperation - Database Software
Once the clusterware is installed as mentioned in the previous post next step is to install the database software. Database software is installed as a non-shared oracle homes. In this role separation...
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Installing 12c (12.1.0.1) RAC on RHEL 6 with Role Seperation - Creating CDB &...
After installing clusterware and database software remaining step is to create the database. In this post a container database (CDB) and a pluggable database (PDB) will be created using DBCA. CDB and...
View ArticleORA-1691: unable to extend lobsegment is expected behavior
ORA-1691 happens when a lob segment cannot extend itself to accommodate the growth due to new data being inserted. Usually remedies are extending the data file and adding a data file. However there's a...
View ArticleChnage in Shared Memory Segment Creation on 12c
It appears that with 12c there's a change in the way shared memory segments are allocated when using automatic shared memory management (ASMM not AMM). Metalink note 15566.1 describe when shmmax...
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Upgrading RAC from 11.2.0.3 to 11.2.0.4 - Grid Infrastructure
11.2.0.4 patchset is available under patch number 13390677. This post list the steps related to upgrading from 11.2.0.3 to 11.2.0.4. It's not a comprehensive post of "how to upgrade" and list only...
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Upgrading RAC from 11.2.0.3 to 11.2.0.4 - Database
After upgrading GI from 11.2.0.3 to 11.2.0.4 next process in upgrading the RAC is to upgrade the database. This include upgrading the database software and database itself. In this post an out-of-place...
View ArticleDowngrade Grid Infrastructure from 11.2.0.4 to 11.2.0.3
The post list the steps for downgrading grid infrastructure from 11.2.0.4 to 11.2.0.3. The environment used for this downgrade had a successful upgrade to 11.2.0.4 from 11.2.0.3[grid@rhel6m1 grid]$...
View ArticleDuplicate Database Without Target Connection or Catalog Connection
There are many techniques for database duplication. There's an earlier post which lists step for duplicating RAC database to a single instance using active database. This post list the steps for...
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Database Performance Monitor - oratop
oratop is a database performance monitoring tool available for download from MOS. It has a interface similar to Unix/Linux top command. Oratop could also be used to monitor remote databases. It's RAC...
View ArticleRole Separation and External Tables
Success of a select query on a external table that is created in a system with role separation whether it's single instance or RAC will depend on the connection (local or remote) and the permissions of...
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Upgrade from 11.1.0.7 to 11.2.0.4 (Clusterware, ASM & RAC)
This is not a step by step guide to upgrading from 11.1.0.7 to 11.2.0.4. There's an earlier post which shows upgrading from 11.1.0.7 to 11.2.0.3 and this post is a follow up to that highlighting mainly...
View ArticlePatching 12c (12.1.0.1) RAC with October 2013 PSU
First critical patch update for 12c was released Oct 15 2013. This post looks at the difference in patching 12c RAC environment (with role separation) compared to 11.2 environment. The environment used...
View ArticleCALIBRATE_IO and Non-Default Block Size
Oracle IO Calibration using CALIBRATE_IO procedure in the dbms_resource_manager package consists of two steps, first step is to find out the IOPS and second is to find the MBPS. According to Oracle...
View ArticleORA-1691: unable to extend lobsegment Message Only on Alert Log When...
Similar to Basic LOB situation mentioned in the earlier post a server side (or alert log only) ora-1691 message appears when inserting to table with a securefile. The test was created using the same...
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Upgrading 11.2.0.3 (11gR2) Database to 12.1.0.1 (12c) Using DBUA
After upgrading grid infrastructure and RAC software next step is to upgrade the actual database. This could be done manually or using DBUA. There are several metalink notes (listed at the end of the...
View ArticleExcessive Audit File (*.aud) Generation
Excessive amount of audit file generation was observed in a 11gR2 RAC environment. The audit trail parameter was set to OS and adump directory was getting populated with *.aud files at a rate of 60 per...
View ArticleSCAN (Single Client Access Name) Set Up Using DNS
Setting up a SCAN allow clients connecting to databases (or instances) in a RAC to use a single name to connect to any database (or instance). It could be considered an alias for all the databases in...
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Parallel Query Used for Result Cache Access
On a new deployment it was discovered that wait class Other was taking a significant portion of the wait time on a business critical SQL (denoted bqm in this case). Comparing similar deployment in the...
View ArticleWM_CONCAT Removed From 12c Workspace Manager?
It appears that wm_concat function has been removed from 12c workspace manager. Oracle always insisted that this is an internal function to be used with Oracle products and not for end user consumption...
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