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QUEUES

CICS Training Class-08

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Introduction to QUEUE’S

Queue’s are temporary storages for holding up records that need

to be processed. They are not physically stored.

The processing is much faster for the queues as they are available

readily in main memory

There are two types of queues :

● Temporary Storage Queue (TSQ)● Transient Data Queue (TDQ)

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Temporary Storage Queue

TSQ’S provides application programmer the ability to store

and retrieve data.

Application can use TSQ like a scratch pad

TSQ are: reated and deleted dynamically

 !o "S table entry required #if recovery !$T required%

"dentified by queue id # & to ' bytes%

(ach record in TSQ identified by relative position called the

Item Number

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More about TSQ

$perations:

)rite a record *ead data sequential and random +pdate ,elete the queue

Access:

Transactions Terminal

Storage :

-ain !on recoverable Auiliary recoverable #must have TST entry%

Typical +se :

,ata passing among Transactions Terminal paging *eport /rinting

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WITEQ TS

● EXEC CICS WRITEQ TS

QUEUE(Q NAME)

R!M(DATA"AREA)

#EN$T%(DATA"&A#UE)

ITEM(DATA"AREA) ' REWRITE

MAIN ' AUXI#AR

● END"EXEC

onditions : "T(-(**0 1(!2(**0 Q",(**0 !$S/A(0 !$TA+T3

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eadQ TS

 – EXEC CICS READQ TS

 – QUEUE(Q NAME)

 – INT!(DATA"AREA)

 – #EN$T%(DATA"&A#UE)

 –

ITEM(DATA"AREA) ' NEXT – END"EXEC

onditions : "T(-(**0 1(!2(**0 Q",(**0 !$S/A(0

 !$TA+T3

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!elete" ts

,elete all entries in the queue

● EXEC CICS DE#ETEQ TS

QUEUE(Q NAME)

● END"EXEC

onditions : "T(-(**0 1(!2(**0 Q",(**0 !$S/A(0

 !$TA+T3

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Transient data "ueue

T,Q provides the programmer with queuing facilities

,ata can be stored fro internal4eternal processing

Stored data can be routed to symbolic destination

T,Qs require ,T entry

"dentified by destination ", & to 5 bytes

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Intra and e#tra partitioned T!Qs

"!T*A partitioned: associated with the same "S subsystem.

Typical uses:● ATI (Automati* tas+ initiation ) asso*iate, -it. trigger /e0e/

● Message s-it*.ing

(tra /artitioned: associated with internal4eternal cics0 to any sequential

dives like ,AS, TA/(

T6/"A1 +S(S :● #ogging ,ata1 transa*tion error messages storing

$perations: )rite a record *ead data sequential and random ,elete the queue

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$utomatic tas% initiation

AT" is the facility through which a cics transaction can be initiated

automatically.

,73,T T6/(8"!T*A0

,(ST",8-S2S0

T*A!S",#-S2&%0

T*"21(98;;

)hen the number of record reaches ;;0 the transaction msg& will be

initiated automatically.

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WITEQ T!

● EXEC CICS WRITEQ TD

QUEUE(Q NAME)

R!M(DATA"AREA)

#EN$T%(DATA"&A#UE)

ITEM(DATA"AREA) ' REWRITEMAIN ' AUXI#AR

● END"EXEC

onditions : "T(-(**0 1(!2(**0 Q",(**0 !$S/A(0 !$TA+T3

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E$!Q T!

 – Rea,s t.e 2ueue ,istra*ti0e/y1 re*or, is not a0ai/ab/e in t.e

2ueue a3ter t.e rea,

 – EXEC CICS READQ TD

 – QUEUE(Q NAME)

 – INT!(DATA"AREA)

 – #EN$T%(DATA"&A#UE)

 – ITEM(DATA"AREA) ' NEXT

 – END"EXEC

onditions : "T(-(**0 1(!2(**0 Q",(**0 !$S/A(0

 !$TA+T3

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!E&ETEQ T!

,elete all entries in the queue

● EXEC CICS DE#ETEQ TD

QUEUE(Q NAME)

● END"EXEC

onditions : "T(-(**0 1(!2(**0 Q",(**0 !$S/A(0

 !$TA+T3

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Di33eren*es bet-een TSQ4s an, TDQ4s

"n TSQ0 data can be written and read either sequentially or randomly0 while

in T,Q0 the data is written or read only sequentially.

"n TSQ0 the data can be read any number of times because it remains in the

queue until the entire queue is deleted. "n a T,Q data item0 it is read only

once.

,ata can be updated in place for TSQ0 but not in T,Q.

The TSQ name is defined dynamically0 while a T,Q name is defined in the

,T. TSQ can be written to auiliary or main storage0 while T,Q is

written to disk.

TSQ does not use a trigger level while T,Q data has a trigger level

#automatic task initiation%.

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T'an% (ou