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Q: What is STORAGECLASS?
Answer:
SMS STORAGECLASS for VSAM placement. STORCLAS on DEFINE. Controls performance, availability. ACS routines may assign. Modern storage management. Replaces explicit volume specifications.
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Q: How does OUTPUT statement work?
Answer:
OUTPUT defines SYSOUT processing options. //OUT1 OUTPUT CLASS=A,DEST=LOCAL,COPIES=2. Reference: //SYSOUT DD SYSOUT=*,OUTPUT=*.OUT1. Centralizes output attributes. Can specify JESDS for JES-level control. Forms, burst options available.
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Q: What is PRTY parameter?
Answer:
PRTY sets selection priority. PRTY=15 on JOB card. Values 0-15 (15 highest). Affects when job selected from queue. JES2 processes higher PRTY first within class. Different from PERFORM (execution priority).
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Q: What is PERFORM parameter?
Answer:
PERFORM assigns service class. PERFORM=n (1-999). JES/WLM determines resource allocation. Higher may get more resources. Installation dependent. Modern systems use WLM service classes instead.
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Q: What is DATACLAS parameter?
Answer:
DATACLAS assigns SMS data class. DATACLAS=classname. Defines DCB attributes, space, data type. ACS routines may assign automatically. Overrides explicit DCB. Simplifies JCL. Installation-defined classes.
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Q: Explain SPECIAL-NAMES paragraph
Answer:
SPECIAL-NAMES maps system names to COBOL names. DECIMAL-POINT IS COMMA for European notation. CURRENCY SIGN IS '$'. SYMBOLIC CHARACTERS name = value. ALPHABET for custom collating. CLASS for character groups.
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Q: What is CLASS condition?
Answer:
CLASS tests character content. IF field IS NUMERIC/ALPHABETIC/ALPHABETIC-LOWER/ALPHABETIC-UPPER. Custom classes in SPECIAL-NAMES: CLASS VOWELS IS 'A' 'E' 'I' 'O' 'U'. Then IF char IS VOWELS. Useful for validation.
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Q: What is CLASS parameter?
Answer:
CLASS assigns job to execution class. CLASS=A on JOB card. Initiators start jobs by class. Determines execution priority, resources. Installations define class characteristics. Multiple classes: CLASS=AB (not common). JES2/JES3 interpret differently.
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Q: What is DFSMS?
Answer:
DFSMS (Data Facility Storage Management Subsystem) automates storage management. Components: SMS, HSM (migration), DFRMM (tape). ACS routines assign classes. Reduces JCL complexity. DATACLAS defines data characteristics.
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Q: Explain DD SYSOUT statement
Answer:
SYSOUT=class routes output to JES spool. SYSOUT=* uses MSGCLASS from JOB. SYSOUT=A specific class. Additional: COPIES=2, DEST=node.userid, FCB=fcb-name. Held output: HOLD=YES. OUTPUT statement for complex options.
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Q: What is INTRDR?
Answer:
SYSOUT=(class,INTRDR) submits output as new job. Internal reader. Programs can submit jobs dynamically. Class often B. Output must be valid JCL. Used for job scheduling, dynamic workflows.
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Q: How to override PROC DD?
Answer:
//procstep.ddname DD overrides. //MYSTEP.SYSOUT DD SYSOUT=H changes SYSOUT class. Can add parameters or replace entirely. Add new DD: //MYSTEP.NEWDD DD DSN=... Position after EXEC procname.
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Q: Explain STORCLAS parameter?
Answer:
STORCLAS assigns SMS storage class. STORCLAS=classname. Determines placement, management, backup. ACS routines may assign. Defines performance characteristics. Installation-defined classes.
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Q: What is MGMTCLAS parameter?
Answer:
MGMTCLAS assigns SMS management class. Controls migration, backup, retention. MGMTCLAS=classname. Defines data lifecycle. HSM uses management class. Installation-defined policies.