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Results tagged with primary-key
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user 77259
In relational database design, a primary key can uniquely identify each row in a table. A primary key comprises a single column or a set of columns.
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InnoDB: SELECT COUNT(*) using primary key 25 times slower on Windows
MySql 5.6, InnoDB. I have a table with 8 million records. It has an integer primary key, and a unique index u1 CHAR(40). It also has a few small fields and a VARCHAR(1000).
SELECT COUNT(*) FROM my_ta …
- 121
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InnoDB: SELECT COUNT(*) using primary key 25 times slower on Windows
It turns out that the difference was the size of innodb_buffer_pool_size. On the Win box it was too low.
It appears that, if you need the primary key, all the records (8 million times 1000 chars) nee …
- 121