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Timeline for Which tables are safe to clear?

Current License: CC BY-SA 3.0

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Jan 10, 2017 at 14:12 comment added mpdonadio Just a side note there, that all of the answers below that mention truncating {cache_form} are not really correct. This is not a true cache table. It contains in progress form submissions. If you delete all of the data in this table, your user may lose data. The proper thing to do with this table is to expire entries.
Jun 3, 2016 at 3:51 history edited avpaderno CC BY-SA 3.0
removed "Drupal" from the title
Oct 8, 2015 at 17:22 answer added kenorb timeline score: 1
Sep 4, 2015 at 17:51 history post merged (destination)
Sep 4, 2015 at 17:50 history edited avpaderno CC BY-SA 3.0
deleted 4 characters in body; edited title
Sep 2, 2015 at 15:23 history edited avpaderno
edited tags
Sep 2, 2015 at 14:13 answer added Henry's Cat timeline score: 5
Sep 2, 2015 at 11:03 vote accept Mitch
Sep 2, 2015 at 11:03
Sep 2, 2015 at 11:03 vote accept Mitch
Sep 2, 2015 at 11:03
Sep 2, 2015 at 8:47 answer added Pierre.Vriens timeline score: 30
Sep 2, 2015 at 8:30 vote accept Mitch
Sep 2, 2015 at 11:03
Sep 2, 2015 at 8:30 vote accept Mitch
Sep 2, 2015 at 8:30
Sep 2, 2015 at 8:14 answer added M a m a D timeline score: 4
S Jun 26, 2013 at 22:42 history edited LLub CC BY-SA 3.0
formatting
S Jun 26, 2013 at 22:42 history suggested Toby Allen CC BY-SA 3.0
formatting
Jun 26, 2013 at 21:30 review Suggested edits
Jun 26, 2013 at 22:42
Jan 26, 2013 at 15:24 vote accept Nigel Waters
Feb 14, 2012 at 19:28 answer added fietserwin timeline score: 2
Feb 13, 2012 at 14:09 answer added thePanz timeline score: 19
Feb 9, 2012 at 17:36 answer added uwe timeline score: 9
Feb 9, 2012 at 14:08 comment added Berdir You can sort the tables based on their size in phpmyadmin. Try that and then look which tables are the biggest and report that here. I've for example seen huge session tables which aren't cleaned up for some reason. That's something you could clear if you can live with users having to log in again (and possibly loosing entered form data if they are on the site, so you might want to coordinate this with the users)
Feb 9, 2012 at 13:52 answer added Attiks timeline score: 7
Feb 9, 2012 at 13:39 answer added BetaRide timeline score: 2
Feb 9, 2012 at 11:47 history tweeted twitter.com/#!/StackDrupal/status/167575285770891264
Feb 9, 2012 at 6:54 history edited Nigel Waters CC BY-SA 3.0
added 7 characters in body
Feb 9, 2012 at 6:49 history edited Nigel Waters CC BY-SA 3.0
added 7 characters in body
Feb 9, 2012 at 6:42 answer added optimusprime619 timeline score: 2
Feb 9, 2012 at 6:25 answer added BetaRide timeline score: 20
Feb 9, 2012 at 5:56 history asked Nigel Waters CC BY-SA 3.0