What is the use of member in pf?

1. How can I create a LF using crtlf command based on a particular member in a multimember PF? Where I have to specify the member name? 2. How to differentiate between the types of join from a Join logical file DDS. Is it possible to have different types of Join Logical files? 3.Any performance difference between Opnqrf and Embedded SQL? When I should prefer Opnqryf and when SQL? 4. I know access path is the path chosen by the program to retrieve data. It can be of keyed access path or arrival sequence. *IMMED- *IMMED description says access path is updated each time record is added or deleted from a member. - What is updating here? *REBLD - The access path is completely rebuilt each time a file member is opened. The access path is maintained until the member is closed, then the access path is deleted. - I am not able to understand this completely. Could anyone explain these more clearly? 5.What is the purpose of using activation group. I know it is a resource allocator, but other than this any other benefits of using an activation group?

2 Answers IBM,

There are six records in a file and we are going to update that records and used commit operation when it complete the update but suppose when it updating the third record,a error occured and operation failed.Is previously two records will be update or whole operation will be rollback? Please confirm it.

2 Answers

what is error handling concepts in cl

3 Answers Active Brains,

When we create a pf and did not fill up maint parameter, then by default which access path will the system take & why?