The ALTER command modifies the attributes of defined data sets and catalogs.

The syntax of the ALTER command is:

Command	Parameters
ALTER	entryname
	[ACCOUNT(account–info)]
	[ADDVOLUMES(volser[ volser...])]
	[BUFFERSPACE(size)]
	[BUFND(number)]
	[BUFNI(number)]
	[BWO(TYPECICS|TYPEIMS|NO)]
	[CCSID(value)]
	[CODE(code)]
	[ECSHARING|NOECSHARING]
	[EMPTY|NOEMPTY]
	[ERASE|NOERASE]
	[EXCEPTIONEXIT(entrypoint)]
	[EXTENDEDADDRESSABLE]
	[FIFO|LIFO]
	[FILE(ddname)]
	[FILEDATA(TEXT|BINARY)]
	[FREESPACE(CI-percent[ CA-percent])]
	[FRLOG(NONE[ REDO])]
	[INHIBIT|UNINHIBIT]
	[KEYS(length  offset)]
	[LIMIT(limit)]
	[LOCK|UNLOCK]
	[LOG(NONE|UNDO|ALL)]
	[LOGREPLICATE|NOLOGREPLICATE]
	[LOGSTREAMID(logstream)]
	[MANAGEMENTCLASS(class)]
	[NEWNAME(newname)]
	[NULLIFY(
	[AUTHORIZATION(MODULE|STRING)]
	[BWO]
	[CODE]
	[EXCEPTIONEXIT]
	[LOG]
	[LOGSTREAMID]
	[MANAGEMENTCLASS]
	[OWNER]
	[RETENTION]
	[OWNER(ownerid)]
	[RECLAIMCA|NORECLAIMCA ]
	[RECORDSIZE(average  maximum)]
	[REMOVEVOLUMES(volser[ volser...])]
	[REUSE|NOREUSE]
	[RLSQUIESCE|RLSENABLE]
	[ROLLIN]
	[SCRATCH|NOSCRATCH]
	[SHAREOPTIONS(crossregion[ crosssystem])]
	[STORAGECLASS(class)]
	[STRNO(number)]
	[SUSPEND|RESUME]
	[TO(date)|FOR(days)]
	[TYPE(LINEAR)]
	[UNIQUEKEY|NONUNIQUEKEY]
	[UPDATE|NOUPDATE]
	[UPGRADE|NOUPGRADE]
	[CATALOG(catname)]