To determine the cause of ESP error "ESP991E ERROR OCCURRED DURING SORT", add the following statements to the ESP History Report job:
//SORTDIAG DD DUMMY
//SYSOUT DD SYSOUT=*
Sample sort sysout:
ICE046A 0 SORT CAPACITY EXCEEDED - RECORD COUNT 215518
ICE253I 0 RECORDS SORTED - PROCESSED: 215518, EXPECTED: 0
ICE753I 1 FWK=(5,2660) SWK=(0,0) TWK=(0,0) RWK=(2,1104) TOTAL=(7,3764) BLK=12256
ICE278I 1 5 WORK DATA SETS WERE INSUFFICIENT TO COMPLETE THIS SORT ...
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In this case, the cause of ESP error ESP991E is "SORT CAPACITY EXCEEDED".