What about data in log tables like gameEvents, halloffame_archive, itemlog, kills, loginEvent, loginseed? With time that tables will have large number of records. Does this affect performance? Do you have any method of archiving them or deleting old log data?
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Hi, as far as I know we don't delete old data.
On gameEvents we've used rolling partitioning by date as old data is less interesting than new data. I mean simply, rename the existing table to a date-stamped name and create a new table called gameEvents which is empty. Not "MySQL partitioning".
Other tables (e.g. itemlog) we prefer to keep a full history intact. But they're rarely read and our asynchronous database access means bigger queries, when needed, are not a problem.
We recently improved the indices on loginEvent as we noticed a delay on login if the database was under load.
For the website (i.e. Hall of Fame, Recent Events, Kills) we use caching to minimise the number of required reads.
By the way, did you see http://stendhalgame.org/wiki/Moving_the_Stendhal_server_to_a_new_host? Huge log tables can be a problem when you want to migrate hardware, and that document explains our solution for migration of a lot of data with very minimal downtime.
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