Can you concatenate datasets with different block sizes?
Concatenated data sets can have different block sizes. In a few cases, the data set with the largest block size must appear first in the concatenation.
How does mainframe calculate block size?
Block size (BLKSIZE) specifies the maximum length, in bytes, of a physical block of storage in MVS….Block size and record length.
| Record Format | Record Length (bytes) | Block Size (bytes) |
|---|---|---|
| FB | 80 | 27,920 |
| FB | 1024 | 27,648 |
| FB | 4096 | 24,576 |
| FB | 8192 | 24,576 |
Which dump program is used for collecting SMF dump?
Using the SMF dump programs describes the dump program for SMF data sets and log streams.
How many datasets can be concatenated in JCL?
You can concatenate as many as 114 PDS as PDSs. No concatenation limit on the PDS members or on PS. Datasets can reside on different devices.
What is concatenation in JCL?
If there is more than one dataset of the same format, they can be concatenated and passed as an input to the program in a single DD name.
What is block size in mainframe?
Block size (BLKSIZE) specifies the maximum length, in bytes, of a physical block of storage in MVS. If BLKSIZE(0) is specified, the system will determine the optimal block size based on the maximum record length (LRECL) and the physical characteristics of the disk, or approximately half of a physical track.
How many blocks are in a track?
A track has 25 blocks, a cylinder has 25*10=250 blocks.
What is SMF and RMF?
RMF stores the contents of each report in an SMF record. Each SMF record contains information similar to the contents of the corresponding formatted report. For each system activity that you select, RMF collects data and formats an SMF record to hold the data.
What is SMF record?
SMF stands for System Management Facility, which is a component of z/OS from IBM. The purpose of SMF is to produce records of activity on a mainframe computer that are then recorded to a file. Types of activities which can be recorded by SMF include errors, software usage, network activity, and much more.
How many sequential datasets can be concatenated together?
The system can retrieve two or more data sets and process them successively as a single sequential data set. This is called sequential concatenation.
How do I merge two datasets in JCL?
JCL for merging data sets directly
- You do not need dynamic allocation of work data sets or SORTWKdd DD statements.
- Instead of the SORTIN DD statement, you use SORTINnn DD statements to define the input data sets. The SORTINnn DD statements name the input data sets, and tell how many data sets will be merged.
How do you concatenate in JCL?
Rules for Concatenation:
- DDname should be coded for the first DD statement only.
- The sequence in which the datasets are coded is the sequence in which they are concatenated.
- We can concatenate PDS, PDS members and PS datasets, but not VSAM datasets.
- All datasets must have the same RECFM.