00C20113

Explanation
  DB2® reached
the limit for concurrent open data sets. The OPEN statement fails
with this reason code when the number of concurrent open data sets
reaches the greater of 32,768 or the value of the DSMAX subsystem
parameter.

System action
  SQLCODE -904 is issued and
the requested open is not performed. Reason code 00C20113 and
the data set name are recorded in the SQLCA. SVC dump and SYS1.LOGREC
recording are not requested.

Operator response
  Notify the system programmer.

System programmer response
  Take one of the following actions: 
Reduce the number of data sets that must be kept open by DB2 by limiting
the amount of concurrent activity. 
Increase the value of the DSMAX parameter