Options of CICS DB2 connections
There are three main types of threads that can be used for DB2 CICS connection:
TYPE=COMD
TYPE=POOL
TYPE=ENTRY
TYPE=COMD
TYPE=POOL
TYPE=ENTRY
COMD is DB2 command thread it is used for only processing DB2 commands through DSNC transaction. It is not used for CICS attachment facility.
POOL is Pool threads are used for all transactions and commands not using an entry type or a DB2 command type. Pool threads are normally used for:
ENTRY is ENtry type thread which is used for:
ENTRY type can be defined as protected as well as unprotected.The MVS subtask for an entry thread is not terminated, even if the entry thread is terminated. This is true for both protected and unprotected entry threads.
Requests for an entry thread can be transferred to the pool, if an entry thread is not available.
POOL is Pool threads are used for all transactions and commands not using an entry type or a DB2 command type. Pool threads are normally used for:
- Low volume transactions
- Overflow transactions from both COMD and ENTRY type threads
- It is terminated immediately when it is unused
ENTRY is ENtry type thread which is used for:
- High volume transactions
- High priority transactions
- Controlled transactions
ENTRY type can be defined as protected as well as unprotected.The MVS subtask for an entry thread is not terminated, even if the entry thread is terminated. This is true for both protected and unprotected entry threads.
Requests for an entry thread can be transferred to the pool, if an entry thread is not available.
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