Use text databases MTA option

File format MTA options:  (bitmask)
The  MTA  option controls whether the reverse "database",  the  general "database", and the forward "database"  are truly on-disk databases, or whether they are instead stored as in-memory structures. As of MS 8.0.2.3, the bits in the option default to 1 if the corresponding URL option is not set and 0 otherwise. The default value was 8 prior to MS 8.0.2.3. The default is 0 in versions of Messaging Server prior to 8.0.2.3. Setting a bit of, so that an in-memory structure is used, makes moot any setting of the corresponding, new in MS 8.0,   MTA option: the in-memory structure will be used in preference to consulting memcache.

If bit 0 (value 1) is set, then the  file   is read when the MTA configuration is initialized or reloaded, and the information from that file is stored in memory replacing all uses of the  general database.

If bit 1 (value 2) is set, then the  file  is read when the MTA configuration is initialized or reloaded, and the information from that file is stored in memory replacing all uses of the reverse database.

If bit 2 (value 4) is set, then the  file  is read when the MTA configuration is initialized or reloaded, and the information from that file is stored in memory replacing all uses of the forward database.

In particular, note that enabling use of such in-memory "databases" means that changes to the "database" (changes to the underlying text file source) require recompiling the configuration, or reloading the configuration, in order to get the change seen in a compiled configuration; see the cnbuild utility and the reload utility. As of MS 6.3P1, text databases support  including other files via the   character, and comment lines (indicated by the presence of any of the    characters in column one).

See also:
 * File format MTA options
 * Database MTA options
 * General database
 * Reverse database
 * Forward database
 * comment_chars MTA Option
 * general_data_size MTA Option
 * reverse_data_size MTA Option
 * forward_data_size MTA Option
 * general_database_url MTA Option
 * reverse_database_url MTA Option
 * forward_database_url MTA Option