Recall what happens to an item when it has been read in. First it is aliased. Secondly, it is checked to see whether it is included or excluded. Then finally, if all the items are wanted, one request is added to its score.
Normally the name of the item is saved before the aliasing takes place. This avoids analog having to do the aliasing again next time the same item is encountered. But this can take up more memory than necessary. So there is a family of LOWMEM commands provided, which tell analog to record the name at a later stage, or even not at all. If you use these commands, analog will have to do a bit more work than normal, but it will use less memory. On most sites, the hosts take up most of the memory, so I'll use the HOSTLOWMEM command as an example.
HOSTLOWMEM 0represents the normal case, when the hostname is recorded before being aliased. If you specify
HOSTLOWMEM 1instead, then the hostname is not recorded until after the aliasing. If you specify
HOSTLOWMEM 2then the name is not recorded until after the inclusion and exclusion lookup has been done as well. And finally, if you give the command
HOSTLOWMEM 3then the hostname is not saved at all, and the Host Report will not be constructed, even if you've asked for it. (The Domain Report can still be constructed though.) The analogous commands for the other items are FILELOWMEM, BROWLOWMEM, REFLOWMEM, USERLOWMEM and VHOSTLOWMEM.
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