Question

I have a MySQL table about 1000 million records. It is very slow when I make a query.
So I split this table by ID into 10 sub-tables with the same structrue.

table_1(1-1000000)

table_2(10000001-2000000)

table_3(20000001-3000000)
......

But how can i query data in a fast way after table splitting?

when I query a user like this: select name from table where name='mark', I don’t know go to which table for querying beacuse I can get the ID range.

Answer 1

Splitting tables this way is totally not the right way when you show your example query. You created more issues actually than solving anything.

Let’s get back to the big table:

Step 1 is to see why it is slow, so post explain sql command to get an overview.

Step 2 is to see whether you can improve that query. Stating things like indexes are not a good solution can be true. If so please provide measurements showing this.

Step 3 is to think outside the box. You are running queries in a very big table which gets constantly inserts. Consider using a specifically for search designed index. For example consider indexing with Solr for the search commands.

Eventually you might even get to the hardware point, it just can’t get faster on this hardware. But first follow through steps, add the right information, concrete measurements and specifications so you can get even more complete support on your case.