Question

have a innodb table with ~3G filesize (i use innodb_file_per_table = 1), just imported from dump and ~1.3G dump file. Have no idea how many recods exist here.

When i execute “select count(id) from $table” i see “27117291” (27,117,291 for readability).
When i execute “select count(id) from $table limit 100” i also see “27117291”

Why it is happening like this?
Is InnoDB REALLY better MyISAM?!

P.S. If i execute “select count(id) from $table where id=73010460;” i see “1”.

Answer 1

select count(id) from $table

Returns one row with count in it. So your limit makes no difference.

(Reference)

+-----------+
| COUNT(id) |
+-----------+
|  <count>  |
+-----------+