This situation triggers when the number of active CICS threads is greater than the threshold. Each CICS region that is connected to DBCTL has two parameters, MINTHRD and MAXTHRD, defined in its system generation to limit the number of threads that can be used for DBCTL database access. Each thread requires a DBCTL PST. For each CICS region, MINTHRD PSTs are always allocated and up to MAXTHRD PSTs can be allocated and made available for threads.
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