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50 DB2 Nuggets #29 : Tech Tip - Generating explain output of query which is part of a stored procedure

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Abstract

50 DB2 Nuggets #29 : Tech Tip - Generating explain output of query which is part of a stored procedure

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To collect explain output for a stored procedure (the stored procedure will be executed) :

db2set DB2_SQLROUTINE_PREPOPTS="EXPLAIN ALL"
db2 terminate
db2stop
db2start
Run the stored procedure
db2exfmt -d db_name -g TIC -w -1 -n % -s % -# 0 -o exfmt_bad.txt

To collect explain output for a stored procedure without executing it, you need to set db2set DB2_SQLROUTINE_PREPOPTS and db2 set current explain mode.

db2set DB2_SQLROUTINE_PREPOPTS="EXPLAIN ALL"
db2 terminate
db2stop
db2start
db2 connect to sample
db2 set current explain mode = explain
Call the stored procedure. It will throw following warning message:
SQL0217W  The statement was not executed as only Explain information requests are being processed.  SQLSTATE=01604
db2exfmt -d sample -g TIC -w -1 -n % -s % -# 0 -o exfmt_bad.txt

Thanks!

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