Attach Command - Tandem ENFORM 058057 Reference Manual

?ATTACH Command

The ?ATTACH command allows you to specify a query processor to use during an
ENFORM session. The syntax of the ?ATTACH command is:
?ATTACH [ process-name ]
process-name
is the name of a query processor.
When one or more server query processors exist on a Tandem system, you can use the
?ATTACH command to specify the query processor you want to use. If you do not
specify the ?ATTACH command, ENFORM defaults to a dedicated query processor.
A dedicated query processor is an ENFORM process that is created for and provides
services to an individual compiler/report writer process. The dedicated query
processor runs for the duration of an ENFORM session until either an error occurs or
an ?ATTACH command is issued specifying a new query processor. When you enter
the ?ATTACH command without a process name, ENFORM starts a new dedicated
query processor for your use.
An ?ATTACH failure is not evident until the first FIND or LIST statement is executed.
The possible ?ATTACH failures and the actions you can take are as follows:
The server query processor already has the maximum number of users it can
handle. In this case, you can wait and then try again specifying the same query
processor; name a different server query processor; or select a dedicated query
processor.
The server query processor does not exist. In this case, you can start the server
query processor, name a server query processor that does exist, or select a
dedicated query processor.
The attached server query processor reached one of two limits set for that
particular server query processor. Either the query reached a data base read limit
or the cost strategy specified by ENFORM exceeded its limit. In this case, you can:
name a server query processor with greater limits or without built-in limits;
change the query; or select a dedicated query processor. The @READS and
@COST-TOLERANCE Option Variable clauses are discussed in Section 5.
058057 Tandem Computers Incorporated
Commands
?ATTACH Command
6–5