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Which is the best READ for this scenario?

 
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cooolguyin
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PostPosted: Thu Jan 27, 2011 9:55 am    Post subject: Which is the best READ for this scenario?
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Hi,

If i want to read and update ALL the records in a adabas file then which of the following READ is efficient and why

READ PHYSICAL

READ BY ISN

READ BY LOGICAL

Thanks...
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Ats

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PostPosted: Thu Jan 27, 2011 3:57 pm    Post subject: Reply to: Which is the best READ for this scenario?
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Well, it depends on data and different situations. All of them can be used for mass update.

READ PHYSICAL - Generally least expensive method to read all records however, potential double updates could be a problem

READ BY ISN - ISN use ensures no double updates & no missed updates

READ LOGICAL - Need to be careful when updating read key fields
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