Library Version 18.1.40

New Logging Option
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## New Logging Option

A new logging configuration option has been added which does not flush the transaction log from the operating system cache to stable storage when a transaction commits or the logging system switches log files. This can further improve performance when all of the applications in an environment use less-than-durable transactions (DB_TXN_NOSYNC and DB_TXN_WRITE_NOSYNC).

### New Parameter Value

- DB_LOG_NOSYNC — A new `flags` parameter value for the DB_ENV->log_set_config() method.

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