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Resolved Retrieval in FOR Loop Locks Up At Random
  1. How-to
0 Votes
  1. Olan Knight
  2. PowerBuilder
  3. Thursday, 30 July 2020 05:00 PM UTC

UPDATE:   31-JUL-2020

   I want to thank Chris, John, and Mike for their suggestions!

   Using most of Jon's suggestions, I added a YIELD() and a GarbageCollect() into the FOR loop - and the next run did not get locked up. After making a few more changes, I'll try the run again and if it does not get locked up I will mark this thread as RESOLVED.

Olan

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

PB2019R2
Windows 10, 64 bit platform
Oracle 12C
32 bit code, running both from the IDE and as an EXE


Summary:
I have a retrieval inside a FOR loop, and at random times it just locks up; i.e. the RETRIEVE call is made but it never completes.

Q: What could be causing the lock and how can I fix it?


Details:
The code flows like this:

Datastore   lds_aur

sqlca.autocommit = TRUE

FOR ll_aur = 1 to ll_max

   ll_rc = lds_aur.Reset
   sqlca.of_disconnect ()                 // Added as a way to maybe resolve the locks: to no avail
   sqlca.of_connect()                      //  "

   lds_aur.dataobject = "whatever"
   lds_aur.SetTransObject (sqlca)

   ll_count = lds_aur.Retrieve(ls_parm)    // This is the call that locks up and never completes

  <do work...>
 
   ll_rc = lds_aur.Update (TRUE, TRUE)
  
   COMMIT;

NEXT
sqlca.autocommit = FALSE

The DBA has checked the database: there are no other users, no locks, no blocking session, and no queries in process.


Setting AutoCommit to TRUE helped significantly; the locks started occuring every few hundred rows rather than every few dozen rows.

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