Two main problems:
1. two persons update a record at the same time
solution:
a. Locking at database level is safest.
b. Never at browser client level.
c. Tricky to be done at server client level.
2. update of changed records for all "attached" browser clients
solution:
a. poll
- the browser client polls the server with the help of the timer -> a lot of
unnecessary traffic
b. push
- the server client pushes to the browser client when changes -> the server
needs to keeo track of client ip addresses etc
Stefan
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