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Enhanced performance of transaction controlled files has been gained by avoiding header lock/unlock when updating the key count in the file header. Header update logic updates the key count and other information for an index file. However, this is not necessary for a transaction-controlled index file as updated user-specific state information is correctly applied to the file at transaction commit.
The index header lock and unlock calls were removed for transaction-controlled files and during automatic recovery. This benefits performance and scalability of index key insert and delete operations on a transaction-controlled index file by reducing the header update contention.
