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I've a MySQL InnoDB table with 1,000,000 records. Is this too much? Or databases can handle this and more? I ask because I noticed that some queries (for example, getting the last row from a table) are slower (seconds) in the table with 1 millon rows than in one with 100.
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400,000 to 1,200,000 rows.
Millions of rows is fine, tens of millions of rows is fine - provided you've got an even remotely decent server, i.e. a few Gbs of RAM, plenty disk space. You will need to learn about indexes for fast retrieval, but in terms of MySQL being able to handle it, no problem.
The number of tables is limited only by the number of database objects, currently 2, 147, 483, 647. A couple of hundred tables isn't going to make a difference to anything except the clarity of your data model.
They are quite good at handling record counts in the billions, as long as you index and normalize the data properly, run the database on powerful hardware (especially SSDs if you can afford them), and partition across 2 or 3 or 5 physical disks if necessary.
I've a MySQL InnoDB table with 1000000 registers. Is this too much?
No, 1,000,000 rows (AKA records) is not too much for a database.
I ask because I noticed that some queries (for example, getting the last register of a table) are slower (seconds) in the table with 1 million registers than in one with 100.
There's a lot to account for in that statement. The usual suspects are:
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