DISPLAY TOPIC

• ¹ Valid only on z/OS when the queue manager is a member of a queue-sharing group.
• ² Valid only on z/OS.
• ³ Not valid on z/OS.

Usage notes for DISPLAY TOPIC

1. On z/OS, the channel initiator must be running before we can display information about cluster topics, using TYPE(CLUSTER) or the CLUSINFO parameter.
2. The TOPICSTR parameter might contain characters that cannot be translated into printable characters when the command output is displayed.

   On z/OS, these non-printable characters are displayed as blanks.

   On Multiplatforms using the runmqsc command, these non-printable characters are displayed as dots

3. We can use the following command (or synonym) as an alternative way to display these attributes.

   DISPLAY TCLUSTER

   This command produces the same output as the following command:

   DISPLAY TOPIC TYPE(CLUSTER)

   If you enter the command in this way, do not use the TYPE parameter.

Parameter descriptions for DISPLAY TOPIC

• All topic definitions
• One or more topic definitions that match the specified name

(generic-topic-name)

The name of the administrative topic definition to be displayed (see Rules for naming IBM MQ objects ). A trailing asterisk (*) matches all administrative topic objects with the specified stem followed by zero or more characters. An asterisk (*) on its own specifies all administrative topic objects.

WHERE

Specify a filter condition to display only those administrative topic object definitions that satisfy the selection criterion of the filter condition. The filter condition is in three parts: filter-keyword, operator, and filter-value:

filter-keyword

Almost any parameter that can be used to display attributes for this DISPLAY command. However, we cannot use the CMDSCOPE, or QSGDISP parameters as filter keywords.

operator

This part is used to determine whether a topic object satisfies the filter value on the given filter keyword. The operators are:

LT

Less than

GT

Greater than

EQ

Equal to

NE

Not equal to

LE

Less than or equal to

GE

Greater than or equal to

LK

Matches a generic string that you provide as a filter-value

NL

Does not match a generic string that you provide as a filter-value

filter-value

The value that the attribute value must be tested against using the operator. Depending on the filter-keyword, this value can be:

• An explicit value, that is a valid value for the attribute being tested.

  We can use operators LT, GT, EQ, NE, LE, or GE only. However, if the attribute value is one from a possible set of values on a parameter, we can use only EQ or NE.

• A generic value. This value is a character string (such as the character string you supply for the DESCR parameter) with an asterisk at the end, for example ABC*. If the operator is LK, all items where the attribute value begins with the string (ABC in the example) are listed. If the operator is NL, all items where the attribute value does not begin with the string are listed. Only a single trailing wildcard character (asterisk) is permitted.

  We cannot use a generic filter-value for parameters with numeric values or with one of a set of values.

Note: On z/OS there is a 256 character limit for the filter-value of the MQSC WHERE clause. This limit is not in place for other platforms.

ALL

Specify this parameter to display all the attributes. If this parameter is specified, any attributes that are requested specifically have no effect; all attributes are still displayed.

This is the default if we do not specify a generic name, and do not request any specific attributes.

CMDSCOPE

This parameter applies to z/OS only and specifies how the command runs when the queue manager is a member of a queue sharing group. CMDSCOPE must be blank, or the local queue manager, if QSGDISP is set to GROUP.

' '

The command runs on the queue manager on which it was entered. This value is the default value.

qmgr-name

The command runs on the queue manager you specify, providing the queue manager is active within the queue sharing group.

We can specify a queue manager name, other than the queue manager on which the command was entered, only if you are using a queue sharing group environment and if the command server is enabled.

*

The command runs on the local queue manager and is also passed to every active queue manager in the queue sharing group. The effect of this process is the same as entering the command on every queue manager in the queue sharing group.

We cannot use CMDSCOPE as a filter keyword.

QSGDISP

Specifies the disposition of the objects for which information is to be displayed. Values are:

LIVE

LIVE is the default value and displays information for objects defined with QSGDISP(QMGR) or QSGDISP(COPY).

ALL

Display information for objects defined with QSGDISP(QMGR) or QSGDISP(COPY).

If there is a shared queue manager environment, and the command is being processed on the queue manager where it was issued, this option also displays information for objects defined with QSGDISP(GROUP).

If QSGDISP(ALL) is specified in a shared queue manager environment, the command might give duplicated names (with different dispositions).

In a shared queue manager environment, use

DISPLAY TOPIC(name) CMDSCOPE(*) QSGDISP(ALL)

to list ALL objects matching name in the queue sharing group without duplicating those objects in the shared repository.

COPY

Display information only for objects defined with QSGDISP(COPY).

GROUP

Display information only for objects defined with QSGDISP(GROUP). This is allowed only if there is a shared queue manager environment.

PRIVATE

Display information only for objects defined with QSGDISP(QMGR) or QSGDISP(COPY). QSGDISP(PRIVATE) displays the same information as QSGDISP(LIVE).

QMGR

Display information only for objects defined with QSGDISP(QMGR).

QSGDISP

QSGDISP displays one of the following values:

QMGR

The object was defined with QSGDISP(QMGR).

GROUP

The object was defined with QSGDISP(GROUP).

COPY

The object was defined with QSGDISP(COPY).

We cannot use QSGDISP as a filter keyword.

CLUSINFO

Requests that, in addition to information about attributes of topics defined on this queue manager, information about these and other topics in the cluster, that match the selection criteria, is displayed. In this case, there might be multiple topics with the same topic string displayed. The cluster information is obtained from the repository on this queue manager.

On z/OS, the channel initiator must be running before we can use the CLUSINFO parameter to display information about cluster topics.

CLUSTER

Limits the information displayed to topics with the specified cluster name if entered with a value in brackets. The value can be a generic name.

If we do not enter a value to qualify this parameter, it is treated as a requested parameter, and cluster name information is returned about all the topics displayed.

On z/OS, the channel initiator must be running before we can use the CLUSINFO parameter to display information about cluster topics.

TYPE

Specifies the type of topics to be displayed. Values are:

ALL

Display all topic types, including cluster topics if you also specify CLUSINFO.

LOCAL

Display locally defined topics.

CLUSTER

Display topics that are defined in publish/subscribe clusters. Cluster attributes include:

CLUSDATE

The date on which the definition became available to the local queue manager, in the form yyyy-mm-dd.

CLUSQMGR

The name of the queue manager hosting the topic.

CLUSTIME

The time at which the definition became available to the local queue manager, in the form hh.mm.ss.

QMID

The internally generated, unique name of the queue manager hosting the topic.

Requested parameters

Specify one or more parameters that define the data to be displayed. The parameters can be specified in any order, but do not specify the same parameter more than once.

Most of the parameters are relevant for both types of topics, but parameters that are not relevant for a particular type of topic cause no output, nor is an error raised.

The following table shows the parameters that are relevant for each type of topic. There is a brief description of each parameter after the table, but for more information, see DEFINE TOPIC.

ALTDATE

The date on which the definition or information was last altered, in the form yyyy-mm-dd.

ALTTIME

The time at which the definition or information was last altered, in the form hh.mm.ss.

CLROUTE

The routing behavior to use for topics in the cluster defined by the CLUSTER parameter.

CLSTATE

The current state of this topic in the cluster defined by the CLUSTER parameter. The values can be as follows:

ACTIVE

The cluster topic is correctly configured and being adhered to by this queue manager.

PENDING

Only seen by a hosting queue manager, this state is reported when the topic has been created but the full repository has not yet propagated it to the cluster. This might be because the host queue manager is not connected to a full repository, or because the full repository has deemed the topic to be invalid.

INVALID

This clustered topic definition conflicts with an earlier definition in the cluster and is therefore not currently active.

ERROR

An error has occurred with respect to this topic object.

This parameter is typically used to aid diagnosis when multiple definitions of the same clustered topic are defined on different queue managers, and the definitions are not identical. See Routing for publish/subscribe clusters: Notes on behavior.

CLUSDATE

The date on which the information became available to the local queue manager, in the form yyyy-mm-dd.

CLUSQMGR

The name of the queue manager that hosts the topic.

CLUSTER

The name of the cluster that the topic is in.

CLUSTIME

The time at which the information became available to the local queue manager, in the form hh.mm.ss.

COMMINFO

The communication information object name.

CUSTOM

This attribute is reserved for the configuration of new features before separate attributes have been introduced. It can contain the values of zero or more attributes as pairs of attribute name and value in the form NAME(VALUE).

DEFPRTY

Default priority of the messages published to this topic.

DEFPSIST

Default persistence of messages published to this topic.

DEFPRESP

Default put response for this topic. This attribute defines the behavior that must be used by applications when the put response type in the MQPMO options has been set to MQPMO_RESPONSE_AS_TOPIC_DEF.

DESCR

Description of this administrative topic object.

DURSUB

Determines whether the topic permits durable subscriptions to be made.

MCAST

Specifies whether the topic is enabled for multicast.

MDURMDL

The name of the model queue for durable managed subscriptions.

MNDURMDL

The name of the model queue for non-durable managed subscriptions.

NPMSGDLV

The delivery mechanism for non-persistent messages.

PMSGDLV

The delivery mechanism for persistent messages.

PROXYSUB

Determines whether a proxy subscription is forced for this subscription, even if no local subscriptions exist.

PUB

Determines whether the topic is enabled for publication.

PUBSCOPE

Determines whether this queue manager propagates publications to queue managers as part of a hierarchy or as part of a publish/subscribe cluster.

QMID

The internally generated unique name of the queue manager that hosts the topic.

SUB

Determines whether the topic is enabled for subscription.

SUBSCOPE

Determines whether this queue manager propagates subscriptions to queue managers as part of a hierarchy or as part of a publish/subscribe cluster.

TOPICSTR

The topic string.

TYPE

Specifies whether this object is a local topic or cluster topic.

USEDLQ

Determines whether the dead-letter queue is used when publication messages cannot be delivered to their correct subscriber queue.

WILDCARD

The behavior of wildcard subscriptions with respect to this topic.

For more details of these parameters, except the CLSTATE parameter, see DEFINE TOPIC.