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[vak255]

normally we got to do READ with UPDATE before REWRITE.Is there any other way to LOCK the record and directly REWRITE it.why i have to READ a record- is that the only way to make sure that it is available,what if i know that the file is available.Pls show me a the other way.

[kolusu]

vak225,

You need to tell us the environment you are trying to rewrite. Is it in Batch cobol or CICS?

You cannot update a record directly without reading it, unless you are talking of updating a record in a DB2 table.

If you are trying to update a record in a file, then just code DISP=OLD in the JCL and the file will be available ONLY for your application. CICS has an exclusive control of the vsam files, so it is like coding DISP=OLD in batch environment.

Hope this helps...

Cheers

Kolusu
_________________
Kolusu
www.linkedin.com/in/kolusu

[vak255]

kolusu,
The Environment : CICS
When i got all the necessay details for updating a record whats the necessary for reading it, before updation.
As far as I know we have to read a record before updation.
Direct rewrite should be faster and efficient.when Direct delete is possible why can't direct REWRITE???

[vak255]

kolusu,
I forgot to mention that Iam using KSDS dataset.

[warp5]

You must be sure that the record that you are going to update has not been changed before updating it - if you do not prevent access to the record before processing it then someone may update it before you do and then your update will destroy the previous update - that is why you must read and lock the record and then update it. The usual process is you read the record, display it for alterations, read it again and log it and check if it has been modified since the last read (check if somebody else has updated it), then update it.