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[mir.git] / dbscripts / dupetrigger / README

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-Dupe check Trigger
-by Matthias "Trigger Hippy" Jordan <mjordan@code-fu.de>
-
-The files in this directory are needed to create a PostgreSQL trigger that
-is used to ensure that no comment and no article is posted twice. This
-happens very often by accident and is very disturbing so we have to prevent
-this somehow. Because Indymedia databases will hopefully grow big very fast,
-we want to do this check as fast as possible. 
-
-So Mir simply issues the INSERT. By this INSERT statement, a trigger gets,
-well, triggered that calculates a CRC-32 checksum of the comment and
-searches for rows with the same checksum. If it finds the checksum, the
-INSERT gets aborted. If the checksum isn't found, it is appended to the row
-and the INSERT is executed.
-
-The trigger works for INSERTs and UPDATEs.