What is FREESPACE ?
Coded in the DEFINE as FREESPACE(ci ca) where ci is the percentage of each control interval to be left free for insertions, ca is the percentage of control intervals... Read more »
‘Visual Basic Interview Questions’ - KyaPoocha.com
What is Control Interval, Control Area ?
Control Interval is analogous to a physical block for QSAM files. It is the unit of I/O. Must be between 512 bytes to 32 k. Usually either 2K or 4K. A larger control... Read more »
Syntax of AMS modal commands ?
Note: these can be used only under IDCAMS and not from the TSO prompt. IF LASTCC(or MAXCC) >(or <,= etc..) value - THEN - DO - command set (such as DELETE,... Read more »
What is IDCAMS ?
IDCAMS is the Access Method Services program. You run the IDCAMS program and supply AMS commands thru SYSIN. (examples of AMS commands are DELETE, DEFINE, REPRO... Read more »
What’s a LDS (Linear Data Set) and what’s it used for ?
LDS is a VSAM dataset in name only. It has unstructured 4k (4096 bytes) fixed size CI’s which do not contain control fields and therefore from VSAM’s standpoint... Read more »
What is File Status in VSAM ?
The FILE STATUS clause of the FILE-CONTROL paragraph allows for each file to be associated with a file status key (i.e., the 2-character data item specified... Read more »
What is the meaning of the DEFINE MODEL parameter ?
It specifies whether Daniela Pestova or Yamila - oops! Wrong models! The MODEL parameter allows you to model your cluster by modeling it after an existing cluster. Read more »
What is the significance of the SHAREOPTIONS parameter ?
It specifies how the file may be shared between jobs and between batch and CICS environments. Read more »
There are at least seven IDCAMS commands; name and explain each of them ?
ALTER modifies information for a catalog, alternate index, cluster or path. BLDINDEX builds the alternate index, of course. DEFINE is used for ALTERNATEINDEX,... Read more »
What is a VSAM slot ?
A relative record dataset (RRDS) consists of a specified number of areas called slots. Each slot is identified by a relative record number (RRN) which indicates... Read more »
What is the VSAM-code field ?
It is a COBOL II enhancement to VSAM batch processing expanding the FILE STATUS field. It is defined in WORKING-STORAGE as a six byte group item with three two... Read more »
Name some common VSAM error conditions and codes ?
They are end of file (10), duplicate key (22), record not found (23), VSAM logic error (90), open problem (92) and space problem (93). Read more »
What is the meaning of dynamic processing ?
It’s rarely used. It means one program uses both sequential and random processing for a VSAM KSDS file. Read more »
Explain the meaning and syntax for the START command ?
The START command is used read other than the next VSAM record. A value must be moved into the RECORD KEY. The KEY clause is optional, but it can be used to specify... Read more »
What is the purpose of the FILE STATUS clause in the SELECT statement ?
The FILE STATUS field identifies the field that VSAM uses to provide information about each I/O operation for the file. Read more »