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Re: Improving time response in SELECTS and INSERTS
Posted by: Rick James
Date: April 28, 2012 05:39PM

> I split the only table in 4 identical tables, one per server.

That's called "sharding".

> I usually send queries about 2 columns, both bigint(16). I created an index in both columns to improve the time response of the SELECTs, but this made that the inserts (with LOAD DATA INFILE) started to take a lot of time, from 1 second to more than 10 minutes per table after creating the indexes.

Too much hand waving. Please provide the SHOW CREATE TABLE.

> I use 4 SELECTs with the UNION command.

Cannot do a union across 4 servers. You can do it across 4 tables, or even 4 databases, but only on a single server. Well... Federated (or MariaDB's FederatedX) may let you do a UNION across multiple machines.

> to SELECT from the 4 tables at the same time

Let's see the SELECT you want to do.


How many rows at a time? Is this a one-time task? Or do you load millions of rows per day?

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Re: Improving time response in SELECTS and INSERTS
April 28, 2012 05:39PM

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