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 Isolation Level 15 

For all SQL statements, the behavior described for isolation level 1 or 10 also applies for isolation level 15. The only difference is that, with isolation level 15, shared locks are requested for all the tables addressed by the SQL statement before processing starts. If the SQL statement generates a result table that is not saved physically, then these locks are released only at the end of the transaction, or when the result table is closed. Otherwise, the locks are released directly after the SQL statement is processed.

When rows are inserted, updated or deleted, exclusive locks are assigned implicitly to the transaction for the rows concerned. These cannot be released until the end of the transaction.

 

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