sas - strange behavior by sas9.3 indexed dataset -


i writing following query in sas 9.3:

create table xyz select count(distinct x)  sasdata.dsn (keep=x);

the sasdata.dsn indexed on variables x , y composite index.

what's strange see query while execution creating temp files of indexes in sastmp (as seen) 

-rw-rw-r-- 1 krousetlp unix_kroger_dm 21798912 jun 19 03:18 sastmp-000000008.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21471232 jun 19 03:18 sastmp-000000009.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21667840 jun 19 03:19 sastmp-000000010.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21864448 jun 19 03:20 sastmp-000000011.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21749760 jun 19 03:21 sastmp-000000012.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21823488 jun 19 03:22 sastmp-000000013.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21651456 jun 19 03:23 sastmp-000000014.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21798912 jun 19 03:25 sastmp-000000015.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21651456 jun 19 03:27 sastmp-000000016.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21569536 jun 19 03:29 sastmp-000000017.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21635072 jun 19 03:31 sastmp-000000018.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21774336 jun 19 03:33 sastmp-000000019.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21757952 jun 19 03:36 sastmp-000000020.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21897216 jun 19 03:38 sastmp-000000021.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21790720 jun 19 03:41 sastmp-000000022.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21774336 jun 19 03:44 sastmp-000000023.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21757952 jun 19 03:48 sastmp-000000024.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21635072 jun 19 03:51 sastmp-000000025.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21618688 jun 19 03:55 sastmp-000000026.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21774336 jun 19 03:58 sastmp-000000027.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21798912 jun 19 04:02 sastmp-000000028.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21839872 jun 19 04:06 sastmp-000000029.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21848064 jun 19 04:11 sastmp-000000030.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21766144 jun 19 04:15 sastmp-000000031.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21757952 jun 19 04:20 sastmp-000000032.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21774336 jun 19 04:25 sastmp-000000033.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21618688 jun 19 04:30 sastmp-000000034.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21774336 jun 19 04:35 sastmp-000000035.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21700608 jun 19 04:40 sastmp-000000036.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21569536 jun 19 04:46 sastmp-000000037.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21676032 jun 19 04:51 sastmp-000000038.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 22077440 jun 19 04:57 sastmp-000000039.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21839872 jun 19 05:03 sastmp-000000040.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21725184 jun 19 05:09 sastmp-000000041.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21577728 jun 19 05:16 sastmp-000000042.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21749760 jun 19 05:22 sastmp-000000043.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21643264 jun 19 05:29 sastmp-000000044.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21258240 jun 19 05:36 sastmp-000000045.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21594112 jun 19 05:43 sastmp-000000046.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 22175744 jun 19 05:50 sastmp-000000047.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21708800 jun 19 05:58 sastmp-000000048.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21880832 jun 19 06:05 sastmp-000000049.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 21700608 jun 19 06:13 sastmp-000000050.sas7bndx.lck -rw-rw-r-- 1 krousetlp unix_kroger_dm 12836864 jun 19 06:17 sastmp-000000051.sas7bndx.lck

is there reason this. performance quite bad have suggestions on how can distinct count of variable involved in composite index.


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