Close the Berkeley DB environment, freeing any allocated resources and closing
any underlying subsystems.
This does not imply closing any databases that were opened in the
Where the environment was initialized with the -txn option,
calling env close does not release any locks still held by the
closing process, providing functionality for long-lived locks.
After env close has been called the env handle may not be
The env close command returns 0 on success, and in the case of error, a Tcl error
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