Interested to Buy Any Domain ? << Click Here >> for more details...
Which DB access method (OSAM or VSAM) is better and why?
- 4 Answers
- 18839 Views
- I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / s
OSAM is better because with even block sizes you can have a
maximum size of 8 GB for a dataset. OSAM supports
sequential buffering, reads 10 consecutive blocks with one
1 I/O operation. This will reduce the elapsed time by 50%.
It also supports queued writes which also results CPU and
elapsed time savings.
| Is This Answer Correct ? | 9 Yes | 0 No |
Answer / john i harper
With IMS HALDBs, OSAM or VSAM can go to 40 terabytes, so
size is no longer a problem. However, OSAM was written by
IMS to do one thing, hold IMS data securely, and move it
quickly. VSAM was written to do many things, making the code
path longer. That increases the time needed to run, and
presents
a greater risk of failure.
Finally, OSAM is written and owned by IMS, so you only have
to ask one development team instead of two if you want any
new features added.
| Is This Answer Correct ? | 3 Yes | 0 No |
Answer / azharuddin khan
Hi Osam is better becoz we can extend upto 8GB in OSAM
whereas in VSAM its only 4GB.
| Is This Answer Correct ? | 2 Yes | 1 No |
Answer / rajasekhar
vsam
later i will give the clear information abt this.
| Is This Answer Correct ? | 2 Yes | 2 No |
how to create a changeman read only audit and update only audit Specifications for the Read only Audit 1) Read HFFD database unqualified. 2) Read FDRT, FDDM, FDAP segments. If FDAP-APP-STS is ‘2’ read the FDAV segment and get the FDAV segment which has FDAV-APV-OPTION as ‘X’ If FDAP-APP-STS is ‘5’ read the HFAC database. Read the ACRT segment qualified based on the key obtained from the FDAP segment from HFFD database. Conditions for writing into output file: a. App Type should be NEWR b. App Status should be 1, 2 & 5. c. Write 50 records per app status. For e.g. first 50 records for App status 1, 2 & 5 each The output file should contain the following fields from the database FDRT-COMP-CTRY-CODE X(03). FDRT-CUST-ID-NUM X(10) FDDM-DEM-SEQ-NUM X(01) FDAP-APP-SEQ X(02) FDAP-JNT-IND X(01) FDAP-APP-STS X(01) FDAV-APV-OPTION X(01) FDAV-APV-DT X(06) FDAV-APV-AMT X(07) ACRT-ACCT-NUM X(06) ACRT-SEG-BUS-TYPE X(02) ACRT-NM1-LAST X(19) ACRT-NM1-SS X(09) ACRT-NM1-1ST X(12) ACRT-NM1-INIT X(01) ACRT-NM1-SFX X(03) ACRT-NM1-TITLE X(02) PSB – DVAN2BMP In case you get a GE for any of the conditions, write to output file along with the details of the database segment which was not found. We need to complete this whole process by tomorrow. Run the audit in DLI mode. 2) Sort the output file created in step 1 on Cust ID, Dem Seq & App Seq. Specifications for the Update Audit 3) Take the output of step 2 as input for an update audit. Details are as follows: Read each record & check the app status. If app status is less than 2 then update the FDAP-NEW- MONEY-ENT to $25000.00 PSB - AUDBMPJ The job would be a BMP job. The test job would be run in IMSE region. Note - The proc (which will be called by the job) and the job should also be present in the change-man package itself. You’ll have a test job in your PDS along with overrides to execute the program in test regions. The job would be a DLI job. The test job would be run in IMSE region. It’ll have the following steps. 1) Delete-define output and error files. 2) Use a copybook for the output layout.
Define pcb?
Explain the advantage of dynamic generation of acb?
What are the valid recovery points?
What are the objectives of dbms in ims?
Which is the DL/I function used in CICS-IMS program? IBM
What are the ways to mapping external control block? a. ENTRY b. PROCEDURE DIVISION USING c. CALL ‘DLITCBL’ d. ALL ABOVE e. A & B
What is acbgen process?
What is the physical nature of a database called?
What are the disadvantages of a hierarchical database?
What is a Root?
Explain the maximum number of fields allowed per segment and what is the maximum number of fields per database?
COBOL 
