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Skip sequential

 
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fawzy47
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PostPosted: Tue Feb 21, 2006 4:22 am    Post subject: Skip sequential
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High,
does any body know what skip sequential processing means
Thank you
Fawzy
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kumaresh.M

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PostPosted: Tue Feb 21, 2006 10:11 am    Post subject: skip seq
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I think that its like dynamic searching,

first it will search in seqencial manner and than it perform randomlly,

for example if we have 20 lines coding,
first we have to search any data seq,
then its getting late we use that skip seq process and do random search

corrections welcome

with regards.
kumaresh.M
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fawzy47
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PostPosted: Tue Feb 21, 2006 10:26 am    Post subject:
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How can you do that
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small_world

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PostPosted: Tue Feb 21, 2006 11:00 am    Post subject: HI
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A COMBINATION OF BOTH DIRECT AND SEQUENTIAL ACCESS CAN BE USED IN A TWO STEP PROCESS CALLED SKIP SEQUENTIAL.USE KEYED DIRECT ACCESS TO FIND A STARTING POINT.ONCE THE INITIAL RECORD IS OBTAINED ADDITIONAL RECORDS ARE RETRIEVED SEQUENTIALLY.SKIP SEQUENTIAL PROCESSING CAN BE USED WITH A ksds,rrds AND IF IT HAS ASN ALTERNATE INDEX AN ESDS.SKIP SEQ IS USEFUL WHEN PERFORMANCE IS IMPORTANT.THIS IS BECAUSE A SIMPLE SEQ IS FASTER THAN DIRECT RETRIEVAL.YOU KNOW THE KEY RBA OR RRN OF THE FIRST RECORD BUT NOT KNOW THE KEY RBA OR RRN OF THE SUBSEQUENT RECORD.YOU WANT TO PROCESS THE DATASET SEQENTIALLY STARTING AT A RECORD OTHER THAN THE FIRST.

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small_world

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PostPosted: Tue Feb 21, 2006 11:08 am    Post subject: HI
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For quick direct access to records, you can browse using skip-sequential processing. This reduces index search time. It is useful if the records are retrieved in ascending or descending order, relatively close to each other, but not necessarily icon_wink.gif
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fawzy47
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PostPosted: Wed Feb 22, 2006 5:43 am    Post subject:
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I think the answer is wrong, Skip sequential processing means you start processing the file sequentialy, let say from record 5 to 10, then you need to skip that sequential to other part of the file say from record 19 to 25 sequentaily also.
and for that you need to RESEBR THEN start another browse
Thanks for all of you who tried to help me regardless of those who answer incorrectly
Fawzy
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