What is DL I call?

What is DL I call?

A DL/I call is a request made by the interface to DL/I to access one or more segments of a database or message queue, or to perform some system function. Certain information must be specified in the DL/I call to communicate the SAS/ACCESS interface’s request to DL/I.

What is DL I in IMS?

Data Language Interface (Data Language/I, DL/I, Data Language/Interface, Data Language/One) is the language system used to access IBM’s IMS databases, and its data communication system. It is implemented from any language by making calls to a software stub, DFSLI000.

What is IMS Language?

IMS stands for Information Management System. IMS provides an easy-to-use, reliable, and standard environment for executing high-performance transactions. IMS database is used by high-level programming languages like COBOL to store data in hierarchical arrangement and access it.

What is Gu call in IMS DB?

The Get Unique ( GU ) call is used to directly retrieve segments and to establish a starting position in the database for sequential processing. The Get Hold Unique ( GHU ) is the hold form for a GU call.

What is PATH call in IMS?

Path calls are used to retrieve/ update an entire path of the hierarchy. Sometimes these can be used to retrieve/update the portion of a path. A path call is requested by using the Command Code ‘D’.

What is IO PCB in IMS DB?

In IMSDB- PCB has a key role. Because this acts as the program’s interface to the database. I-O PCB is the first one we need to give in the Entry statement of a program. There are 4 PCBs available: I-O- PCB: It will do DBCTL requests.

How do you analyze IMS data?

To analyze the IMS data sets:

1. On the IMS Primary Menu, select Option 2, Analyze database data sets.
2. Enter D to analyze the dynamic allocation data sets or R to analyze the RECON data sets.
3. Press Enter to edit the JCL stream.
4. To submit the job, enter SUB.
5. Check that the return code MAXCC is 4 or less.

What is PCB mask in IMS DB?

IMS DB – PCB MASK. PCB stands for Program Communication Block. PCB Mask is the second parameter used in the DL/I call. It is declared in the linkage section.

What does IMS do if you use the D and N command codes together?

Restriction: If you use D and N command codes together, IMS retrieves the segment but does not replace it. The N command code applies only to REPL calls, and IMS ignores it if you include the code in any other call.

Will IO PCB mask mentioned in PSB?

Note! PCBs are passed by IMS to program in the same order they are listed in the PSB. The IO-PCB must be listed first.

What does a get call in DL / I do?

DL/I calls are categorized as Get calls or Update calls. A Get callis a call that retrieves (reads) a segment or segments. An Update callperforms some kind of write function, such as inserting a new segment or replacing or deleting an existing segment. The basic DL/I database call functions are listed here.

When to use DLET code in IMS DL / I?

‘DLET’ code is used for the Delete function. It is used to remove a segment from an IMS DL/I database. Given below is the syntax of a DLET call −

How to define dl / I functions in COBOL?

For specifying the DL/I function, the programmer needs to code one of the 05 level data names such as DLI-GU in a DL/I call, since COBOL does not allow to code literals on a CALL statement. DL/I functions are divided into three categories: Get, Update, and Other functions. Let us discuss each of them in detail.

Why do I need SSA for DL / I call?

An SSA provides additional information for the DL/I call. Point-2: The simplest SSA identifies a segment type for the call to access. Other SSAs not only identify the segment type, but they also specify a value or a set of values to select a particular segment occurrence.