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What you should do and not do where locking is concerned...

  • Do Use the locking mechanism when changing table records (change = create, update and/or delete)
  • Don't Create a new lock object or use an alternative one if one is already set up for the logical unit of work you want to address.
  • Do Look for (and always find) the lock objects SAP is using for their tables, if you need to direclty update a SAP table
  • Don't Assume that not using the locking mechanism will lead to a reliable system: you know better!
  • Do Make sure your own program can run several times at the same time - or protect your program from allowing this (via locking)

Bold statements

  1. (It is assumed that) No standard SAP R/3 table update is done without locking
  2. Even if locking is forgotten about in an ABAP development, locking is still done on a database level, making sure database updates can be performed. This is very reliable locking, but no update should be done without locking described in these articles
  3. Locking a table does not stop physical changes to tables: a table update can still be done even when locked by another user (try this!)