In DLZ, as packaged with bind9, currently a variety of db drivers are supported,
grep "AC_ARG_WITH(dlz_" contrib/dlz/config.dlz.in
AC_ARG_WITH(dlz_postgres,
AC_ARG_WITH(dlz_mysql,
AC_ARG_WITH(dlz_bdb,
AC_ARG_WITH(dlz_filesystem,
AC_ARG_WITH(dlz_ldap,
AC_ARG_WITH(dlz_odbc,
AC_ARG_WITH(dlz_stub,
Of those, as (historically) pointed out @
http://bind-dlz.sourceforge.net/driver_docs.html
BDB drivers provide the "best performance"
Berkeley DB Drivers
Currently two BDB drivers are provided with DLZ. In the future a
third may be developed to provide even better performance. All the drivers take
advantage of Berkeley DB's built-in caching to improve performance. The
Berkeley DB drivers provide the best performance for DLZ.
(1) is that still/currently the case with bind 9.10+ ?
(2) are there any available metrics comparing BDB with Filesystem drivers?
With BDB's licensing change from Sleepycat -> AGPL (cref:
https://lwn.net/Articles/557820/,
https://developers.slashdot.org/story/13/07/05/1647215/oracle-quietly-switches-berkeleydb-to-agpl)
distros (e.g. Debian) & other server apps (e.g., Postfix) have added support
for, and/or currently recommend use of, OpenLDAP 'LMDB' (e.g.,
http://symas.com/mdb/,
https://en.wikipedia.org/wiki/Lightning_Memory-Mapped_Database), database as a
license-friendly, performant alternative.
TBH, I don't know WTF is going on *currentlY* with libdb vX.X's licensing; it's
all bit fuzzy so far as I've (re)read. My personal preference is an
Oracle-free deployment; opinions & needs vary, of course.
What's Bind's position on BDB dependency & support, and implementation any
alternative such as LMDB, going forward?
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