Explain about LMINIT - generate a data ID for a data set
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Answer Posted / dimpy19
1.The LMINIT service allows the dialog to associate a data ID for ISPF library or PS or PDS
2. The data ID is generated by LMINIT and can be used to identify the data set for processing by other library access services or the BROWSE or EDIT service
3.If LMINIT is issued with an enqueue (ENQ) of SHRW and LMOPEN is issued with the OUTPUT option, it is essential that an LMCLOSE is issued when the dialog has finished processing the data set,
since the DASD volume is reserved until LMCLOSE is invoked.
4. LMQUERY service to find out how the LMINIT parameters are set
5.The requirements for enqueuing (ENQ) the data within ISPF so that the dialog can use it in the desired manner.
a.SHR shows that the existing data can be shared; default for INPUT in LMOPEN service
b.EXCLU shows that exclusive use of the data is required; for example, when you want to change the data no one else can have access to it.
c.SHRW permits a shared write for the data. This option is used by ISPF Edit. It is used only for a partitioned data set.
In this way, more than one user can read from the data, but members can be rewritten when necessary through an enqueue or dequeue used by Edit.
Edit can now have the data ID open for INPUT and OUTPUT at the same time.
A data set that is allocated with an enqueue of SHRW can be opened for either INPUT or OUTPUT using the LMOPEN service.
d.MOD shows that more records are to be added to the end of a sequential data set. MOD is used with the OUTPUT option of the LMOPEN service.
>>-ISPEXEC--LMINIT--DATAID(data-id-var)------------------------->
>--+-| PROJECT options |-+--+----------------+------------------>
+-DATASET(dsname)-----+ '-VOLUME(serial)-'
'-DDNAME(ddname)------'
>--+--------------------+--+------------------+----------------->
'-PASSWORD(password)-' | .-SHR---. |
'-ENQ(-+-EXCLU-+-)-'
+-SHRW--+
'-MOD---'
>--+--------------+--------------------------------------------><
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