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Rohit Umarjikar
Global Moderator
Joined: 21 Sep 2010
Posts: 3051
Location: NYC,USA
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| In our system alternate indexes are built every night. IDCAMS BLDINDEX is used to do this. It’s consuming lot of CPU. As a value-add, we are trying to convert this to GVBLDIX (CA Faver). I heard that this tool runs faster. This is not used here in any jobs. So I would like to know if you can find information about this to see if anyone is using it. If so, I need the sample JCL? |
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Gnanas N
Active Member
Joined: 06 Sep 2007
Posts: 792
Location: Chennai, India
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This is from ca.
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| GVBLDIX is a utility that builds one or more alternate indexes for a VSAM base cluster. When building multiple alternate indexes related to a particular base cluster, GVBLDIX only needs to read the base cluster once. To further optimize performance, GVBLDIX utilizes your in-house SORT software. The result is dramatic I/O savings, CPU savings (up to 50%), and reduced elapsed time. |
For more details and success stories, you need to contact ca technologies. |
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Rohit Umarjikar
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Joined: 21 Sep 2010
Posts: 3051
Location: NYC,USA
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Thanks Gana,
Just in case of if somebody has implemented it then the knowledge is very useful. |
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dick scherrer
Moderator Emeritus
Joined: 23 Nov 2006
Posts: 19244
Location: Inside the Matrix
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Hello,
Several of my clients have used Faver. They have been quite pleased with the product.
Many (most?) products that perform various IDCAMS functions do so with considerably better performance. |
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Rohit Umarjikar
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Joined: 21 Sep 2010
Posts: 3051
Location: NYC,USA
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Dick,
Do you have any stats related to performance for any one JCL, also if you could give me the sample JCL then would help to great extent.
Thanks again!! |
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dbzTHEdinosauer
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Joined: 20 Oct 2006
Posts: 6966
Location: porcelain throne
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| give me the sample JCL |
to/for what?
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| Do you have any stats |
talk to sales reps about product stats.
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| related to performance for any one JCL |
you probably expect someone to give you a serious response. |
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dick scherrer
Moderator Emeritus
Joined: 23 Nov 2006
Posts: 19244
Location: Inside the Matrix
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Hello,
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| Do you have any stats related to performance for any one JCL, |
No, i don't. This was some time ago, but my recollection is that everything used less resources with Faver.
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| also if you could give me the sample JCL then would help to great extent. |
I don't have access to a system running Faver now. IIRC, there are examples in the documentation. If you do not have the product installed for a trial, what good would the jcl do?
If your organization is actually comparing/considering Faver, CA will help you. They want to make the sale  |
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Pete Wilson
Active Member
Joined: 31 Dec 2009
Posts: 580
Location: London
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CA Faver is very effective, but unless your Base cluster is enormous I wouldn't expect an IDCAMS BLDINDEX to take very long or use significant CPU.
You may want to explore your Base Cluster and AIX definitions have the best CISIZE/CASIZE, and test buffer settings in your jobs JCL first to see what the effect would be if they were tuned properly. Check out the AMP='BUFND=xx,BUFNI=xx' values for a start. A good rule of thumb is BUFND= 2 x number of CI's that fit in a track + 1, and BUFNI=3.
Check with your local support if there is an automated buffering tool like Performance Solution in place as well, it may just need your jobname or file name mask added to it's parameters. |
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Rohit Umarjikar
Global Moderator
Joined: 21 Sep 2010
Posts: 3051
Location: NYC,USA
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| Thanks, Pete and others. |
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