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Access a segment which is being updated by other program

 
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tramasamy
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Joined: 17 Dec 2002
Posts: 12
Topics: 8
PostPosted: Fri Jan 03, 2003 3:27 pm    Post subject: Access a segment which is being updated by other program Reply with quote
I have one program which is updating a particular segment.Also one more Program is trying to read the values from the same segment. Is it possible to read the values like this..

If so What procopt should i mention in the PCB ?

Ramasamy
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kolusu
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Joined: 26 Nov 2002
Posts: 12376
Topics: 75
Location: San Jose
PostPosted: Tue Jan 07, 2003 11:16 am    Post subject: Reply with quote
Tramasamy,

I had to dig a few programs to find out the solution for your question. you can use PROCOPT=GO in the second program which does only the read.

Procopt O means read only and does not enqueue to check availability. Selecting PROCOPT=GO, GON, or GOT for DEDBs indicates that read without integrity is in effect. No locking mechanism is used to maintain the integrity of the retrieved data. O must be specified as GO, GON, or GOT, and may not be used in conjunction with H.

For a very small set of applications and data, PROCOPT=GOx offers some performance and parallelism benefits. However, it does not offer application data integrity. For example, using PROCOPT=GOT in an online environment on a full-function database can causeperformance degradation. The T option forces a re-read from DASD, negating the advantage of very large buffer pools and VSAM hiperspace for all currently running applications and shared data.

Hope this helps...

cheers

kolusu
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tramasamy
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Joined: 17 Dec 2002
Posts: 12
Topics: 8
PostPosted: Tue Jan 07, 2003 12:27 pm    Post subject: Reply with quote
yeap.. I got the point...Thank you !!.

Rams
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