Let's say the display qmgr command returns the following for the IBM MQ queue manager named MANAGER01.

Notice in this example that the MAXMSGL (max message length) is set to the default value of 41943040 bytes (about 41 MB).

~]# echo "display qmgr" | runmqsc MANAGER01
   QMNAME(MANAGER01)                       ACCTCONO(DISABLED)
   ACCTINT(60)                             ACCTMQI(OFF)
   ACCTQ(OFF)                              ACTIVREC(MSG)
   ACTVCONO(DISABLED)                      ACTVTRC(OFF)
   ADVCAP(ENABLED)                         ALTDATE(2018-04-26)
   ALTTIME(11.04.25)                       AMQPCAP(YES)
   AUTHOREV(ENABLED)                       CCSID(819)
   CERTLABL(example.com)                   CERTVPOL(ANY)
   CHAD(DISABLED)                          CHADEV(ENABLED)
   CHADEXIT( )                             CHLEV(ENABLED)
   CHLAUTH(DISABLED)                       CLWLDATA( )
   CLWLEXIT( )                             CLWLLEN(100)
   CLWLMRUC(999999999)                     CLWLUSEQ(LOCAL)
   CMDEV(DISABLED)                         CMDLEVEL(910)
   COMMANDQ(SYSTEM.ADMIN.COMMAND.QUEUE)    CONFIGEV(ENABLED)
   CONNAUTH(MANAGER01.LDAP.AUTHINFO)       CRDATE(2018-04-11)
   CRTIME(17.41.33)                        CUSTOM( )
   DEADQ(SYSTEM.DEAD.LETTER.QUEUE)         DEFCLXQ(SCTQ)
   DEFXMITQ( )                             DESCR(Manager01 Queue Manager)
   DISTL(YES)                              IMGINTVL(60)
   IMGLOGLN(OFF)                           IMGRCOVO(YES)
   IMGRCOVQ(YES)                           IMGSCHED(MANUAL)
   INHIBTEV(ENABLED)                       IPADDRV(IPV4)
   LOCALEV(ENABLED)                        LOGGEREV(DISABLED)
   MARKINT(5000)                           MAXHANDS(256)
   MAXMSGL(41943040)                       MAXPROPL(NOLIMIT)
   MAXPRTY(9)                              MAXUMSGS(10000)
   MONACLS(QMGR)                           MONCHL(OFF)
   MONQ(LOW)                               PARENT( )
   PERFMEV(ENABLED)                        PLATFORM(UNIX)
   PSMODE(ENABLED)                         PSCLUS(ENABLED)
   PSNPMSG(DISCARD)                        PSNPRES(NORMAL)
   PSRTYCNT(5)                             PSSYNCPT(IFPER)
   QMID(MANAGER01_2018-04-11_17.41.33)     REMOTEEV(ENABLED)
   REPOS( )                                REPOSNL( )
   REVDNS(ENABLED)                         ROUTEREC(MSG)
   SCHINIT(QMGR)                           SCMDSERV(QMGR)
   SPLCAP(ENABLED)                         SSLCRLNL( )
   SSLCRYP( )                              SSLEV(ENABLED)
   SSLFIPS(YES)                         
   SSLKEYR(/shared/qmgrs/MANAGER01/ssl/MANAGER01)
   SSLRKEYC(0)                             STATACLS(OFF)
   STATCHL(LOW)                            STATINT(1800)
   STATMQI(OFF)                            STATQ(OFF)
   STRSTPEV(ENABLED)                       SUITEB(NONE)
   SYNCPT                                  TREELIFE(1800)
   TRIGINT(600000)                         VERSION(09010003)
   XRCAP(YES)                           

The alter qmgr command can be used to update the queue manager settings.

AVOID TROUBLE

When a value is a string and contains one or more white spaces, the value must be wrapped in quotes. In this example, Queue Manager is wrapped in quotes.

echo "alter qmgr DESCR ('Queue Manager')" | runmqsc MANAGER01

AVOID TROUBLE

When a value is an integer, the value must NOT be wrapped in quotes. In this example, 100000000 is not wrapped in quotes.

echo "alter qmgr MAXMSGL (100000000)" | runmqsc MANAGER01