Q |
What is a DBD ? |
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DBD stands for DATABASE DEFINITION. It is to define segements,key fields and access methods used for an IMS Database.
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Q |
What is a PSB ? |
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PSB stands for PROGRAM SPECIFICATION BLOCK.It is made up of one or more pcb's.It also defines the database used by the application program. |
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Q |
What is an ACB ? |
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ACB stands for APLICATION CONTROL BLOCK.It Contains the information of the PSB with the corresponding DBD information. |
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What is SSA ? |
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SSA stands for SEGMENT SEARCH ARGUMENTS which is used to describe which segments to be retrieved. |
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What are the different types of SSA's ? |
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There are 2 types of SSA’S .
QUALIFIED SSA: It is used to retrieve a particular occurrence of a segment.
UNQUALIFIED SSA: It is used when no particular segment occurrence is requested. |
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Q |
What is the status code after a successful execuetion of a DL/I call ? |
A |
The status code will have spaces after a successful execuetion of a a DL/1 call. |
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Q |
What are the four control blocks of Message Format Service (MFS) ? |
A |
Message Input Data (MID):Describes the input message as the application program sees it.
Message Output Data (MOD):Describes the output message as the application program formats it.
Data Input Format (DIF):Describes the screen format for accepting input from the user.
Data Output Format (DOF):Describes the screen format as the user sees it.
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Q |
What are the the 3 essential fields required for a DL/I call ? |
A |
Function Code(GU,GHU,ISRT,REPL...)
PCB Mask
I/O Area |
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