Update multiple tables with 20 Million record each

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i want to know the fastest way to update couple of tables using mysql where eahc table got abt 20 Million record , plz help me .

thnx in advance

Posted 16-May-10 22:48pm

KaRaMiLo

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Adrian Pasik · Accepted Answer · 2010-05-17T01:55:00

Solution 1

use indexes and run UPDATE ;-) But really, DBF's are long gone and table size isnt that a problem, as long Your WHERE item is indexed. You can cut off transaction if You need extra performance but it strongly depends on Your scenario

Posted 17-May-10 1:55am

Adrian Pasik

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KaRaMiLo 17-May-10 8:14am

will i am not so good in mysql , so i really don't know if this going to make a problem or not . But the item in where clause is the same item which will be updated (is it going to to make a problem or not ?).
after adding index to that item inside where clause i will use the item or the index (i guess the item rite ?)

Adrian Pasik 19-May-10 5:39am

i have done similar scenario and there was'nt any problems. Try with index and without and then pick Your option (but try with.. lets say 1k of UPDATE statement so You can really measure performance gains)