hi all ,
i'm trying to improve performance of a quite big and heavily used mysql
set of tables.
i want to create some indexes on this table , but before this , i'd like
to remove the ones created by my predecessor , which are sometimes
duplicate , and somtimes useless.
here is an output from show index :
-+---------------+------------+-------------------+--------------+-------------+
C| Table | Non_unique | Key_name | Seq_in_index |
Column_name |
-+---------------+------------+-------------------+--------------+-------------+
A| v2easy0_users | 0 | PRIMARY | 1 |
id |
A| v2easy0_users | 0 | PRIMARY | 2 |
id |
A| v2easy0_users | 0 | login | 1 |
login |
A| v2easy0_users | 0 | id | 1 |
date |
A| v2easy0_users | 0 | id | 2 |
id |
A| v2easy0_users | 0 | id | 3 |
login |
A| v2easy0_users | 1 | login connexion | 1 |
login |
A| v2easy0_users | 1 | index id | 1 |
id |
first of all , i'm asking myself : why is there 2 primary keys on the
same column ?
i'd want to remove the second index , but since it has the same name
than the first , how would i do something like that?
then , i'd like to remove the index "login connexion" , and the index
"index id" , but the problem is :
mysql> drop index login connexion on v2easy0_users;
ERROR 1064: You have an error in your SQL syntax near 'connexion on
v2easy0_users' at line 1
(the same goes with ' and " around the index name)
! of course , mysql doesn't accept spaces in index names , so why did he
accepted it on creation ?
it seems that i can't remove those index , which are never used by the
optimizer (i used explain) , and which slow down my insert and updates...
should i dump then recreate this table?
i'm a bit stuck here , thanks for your help , and sorry for my english ...
ben
