/usr/share/dovecot/dovecot-db.conf.ext is in dovecot-core 1:2.0.19-0ubuntu2.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | # Example DB_CONFIG for Berkeley DB. Typically dict_db_config setting is used
# to point to this file.
# http://www.oracle.com/technology/documentation/berkeley-db/db/ref/env/db_config.html
# Maximum number of simultaneous transactions.
set_tx_max 1000
# http://www.oracle.com/technology/documentation/berkeley-db/db/ref/lock/max.html
#set_lk_max_locks 1000
#set_lk_max_lockers 1000
#set_lk_max_objects 1000
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