Author: jerryte
Subject: VSAM define for large file
Posted: Wed Oct 05, 2016 1:51 am (GMT 5.5)
I want to define a VSAM file that will be loaded once with a large amount of data (50M records). The key is 20 bytes followed by another 20 bytes of data. After loading it will then be read by a program to lookup the key value. No further insert/update/delete will be done.
Below is what I coded. Are there any options that will speed up the read access?
Subject: VSAM define for large file
Posted: Wed Oct 05, 2016 1:51 am (GMT 5.5)
I want to define a VSAM file that will be loaded once with a large amount of data (50M records). The key is 20 bytes followed by another 20 bytes of data. After loading it will then be read by a program to lookup the key value. No further insert/update/delete will be done.
Below is what I coded. Are there any options that will speed up the read access?
| Code: |
| DEFINE CLUSTER - (NAME(my.test.VSAM) - INDEXED NONSPANNED - RECORDSIZE(40 40) KEYS(20 0) - NOREUSE - NOERASE - SPEED - OWNER(me) - BUFFERSPACE(66048) - FREESPACE(0 0) - SHR(1 3)) - INDEX(NAME(my.test.VSAM.INDEX) - TRACKS(1000 1000) CISZ(4096) ) - DATA(NAME(my.test.VSAM.DATA) - TRACKS(1000 1000) - ) |