It is possible to merge multiple databases into one single database.
The command line syntax is:
asearch [options] target-database-path merge database1 [database2][database3 ...]
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For example:
asearch /usr/alkaline/foo/ merge /usr/alkaline/bar/
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The target database must exist and is being merged into.
When merging, warnings will be issued when same urls are present in both source and target databases.
The resulting database is a true union (a real complex merge), each url or indexed word is present once only
as if the indexing was done from scratch.