Library Version 11.2.5.3

Exclusive Transactions in the SQL Layer
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## Exclusive Transactions in the SQL Layer

Issuing the SQL command `BEGIN TRANSACTION EXCLUSIVE` will now cause any other transactions accessing the database to block, or return a `SQLITE_BUSY` or `SQLITE_LOCK` error, until the exclusive transaction is committed or aborted. Previously, non-exclusive transactions could execute concurrently with an exclusive transaction.

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