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From:Michael Dykman Date:August 10 2010 9:10pm
Subject:Re: Dropping ALL indexes from a database / not just a table?
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It's not a completely solution and will need some tweaking..  You
might have to run the PRIMARY KEYS distinctly from the rest.

 - michael dykman


On Tue, Aug 10, 2010 at 4:43 PM, Nunzio Daveri <nunziodaveri@stripped> wrote:
> Hello Michael, thanks for the one liner.  I ran it BUT I started to get
> errors after I ran it the first time, this is what I got the 2nd time I ran
> it (first time I ran it I had 63 rows in the query, the 2nd time I have 9).
> I ran it twice to make sure it got rid of the indexed.  I verified the index
> size dropped from 850 mb to 65 mb.
>
> +-------------------------------------------------------------------------+
> | concat('ALTER TABLE ', TABLE_NAME, ' DROP INDEX ', CONSTRAINT_NAME,';') |
> +-------------------------------------------------------------------------+
> | ALTER TABLE dbt_Fruits DROP INDEX
> PRIMARY;                        
> |
> | ALTER TABLE dbt_Veggies DROP INDEX
> PRIMARY;                             
> |
> .
> .
> .
> | ALTER TABLE dbt_Logs DROP INDEX
>
> PRIMARY;                                    
> |
> +-------------------------------------------------------------------------+
> 9 rows in set (0.01 sec)
>
> mysql> ALTER TABLE dbt_Fruits DROP INDEX PRIMARY;
> ERROR 1064 (42000): You have an error in your SQL syntax; check the manual
> that corresponds to your MySQL server version for the right syntax to use
> near 'PRIMARY' at line 1
> mysql> ALTER TABLE dbt_Logs DROP INDEX PRIMARY;
> ERROR 1064 (42000): You have an error in your SQL syntax; check the manual
> that corresponds to your MySQL server version for the right syntax to use
> near 'PRIMARY' at line 1
> mysql>
>
> Thanks again...
>
> Nunzio
> ________________________________
> From: Michael Dykman <mdykman@stripped>
> To: Nunzio Daveri <nunziodaveri@stripped>
> Cc: Anirudh Sundar <sundar.anirudh@stripped>; mysql@stripped
> Sent: Tue, August 10, 2010 3:17:48 PM
> Subject: Re: Dropping ALL indexes from a database / not just a table?
>
> This should give you a good starting point (not tested):
>
> select distinct concat('ALTER TABLE ', TABLE_NAME, ' DROP INDEX ',
> CONSTRAINT_NAME,';')
> from information_schema.key_column_usage where
> TABLE_SCHEMA='<mydatabase>';
>
> - md
>
> On Tue, Aug 10, 2010 at 10:43 AM, Nunzio Daveri <nunziodaveri@stripped>
> wrote:
>> Thanks for the feedback.  What I am trying to do is two things:
>>
>> 1. Remove all indexes and make the database smaller to copy and move to
>> another
>> prod box. Currently my indexes are in the double digit GB! Yikes ;-)
>>
>> 2. Remove all indexes so I can find out which ones are needed then tell
>> mysql to
>> recreate them and apparently it lessen data fragmentation if it starts
>> from
>> scratch vs. turning on and off.
>>
>> I was hoping to just remove all and then start from scratch so I know the
>> data
>> is not fragmented on the drives.
>>
>> Thanks again...
>>
>> Nunzio
>>
>>
>>
>>
>> ________________________________
>> From: Anirudh Sundar <sundar.anirudh@stripped>
>> To: Nunzio Daveri <nunziodaveri@stripped>
>> Cc: mysql@stripped
>> Sent: Tue, August 10, 2010 1:06:41 AM
>> Subject: Re: Dropping ALL indexes from a database / not just a table?
>>
>> Hello Nunzio,
>>
>> Instead of Dropping a index, you can disable the indexes and get the work
>> done
>> and re-enable them.
>>
>> If you are ok with this then run the below as a shell script :-
>>
>> MUSER="username"
>> MPASS="password"
>> DATABASE="dbname"
>>
>> for db in $DATABASE
>> do
>>  echo "starting disabling indexes for database -- $db"
>> echo "----------------------------------------------------------"
>> TABLES=`mysql -u $MUSER -p$MPASS $db -e "show tables"`
>> for table in $TABLES
>> do
>> mysql -u $MUSER -p$MPASS $db -e "Alter table $table disable keys"
>> done
>>
>> echo "completed disabling indexes for database -- $db"
>> done
>>
>> Cheers,
>> Anirudh Sundar
>>
>>
>>
>> On Tue, Aug 10, 2010 at 1:33 AM, Nunzio Daveri <nunziodaveri@stripped>
>> wrote:
>>
>> Hello Gurus, is there a way / script that will let me DROP ALL the indexes
>> in a
>>>single database?  for example, lets say my database is call db_Animals,
>>> and
>>>inside db_Animals there are 97 tables, is there a SINGLE command or a perl
>>>script of some kind that can read all the MYI files, remove the .MYI from
>>> the
>>>file name then proceed to deleting whatever indexes it finds?  I am
> doing
>>> this
>>>to debug a server that seems to be slow and sluggish.  After I am done
>>> deleting
>>>I will review the slow query logs and then re-index to get the best
>> performance?
>>>
>>>TIA...
>>>
>>>Nunzio
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>
>
>
> --
>  - michael dykman
>  - mdykman@stripped
>
>  May the Source be with you.
>
>



-- 
 - michael dykman
 - mdykman@stripped

 May the Source be with you.
Thread
Dropping ALL indexes from a database / not just a table?Nunzio Daveri9 Aug
  • Re: Dropping ALL indexes from a database / not just a table?Anirudh Sundar10 Aug
    • Re: Dropping ALL indexes from a database / not just a table?mos10 Aug
    • Re: Dropping ALL indexes from a database / not just a table?Nunzio Daveri10 Aug
      • Re: Dropping ALL indexes from a database / not just a table?Michael Dykman10 Aug
        • Re: Dropping ALL indexes from a database / not just a table?Nunzio Daveri10 Aug
          • Re: Dropping ALL indexes from a database / not just a table?Michael Dykman10 Aug
            • Re: Dropping ALL indexes from a database / not just a table?Nunzio Daveri10 Aug
              • Re: Dropping ALL indexes from a database / not just a table?Michael Dykman11 Aug
                • Re: Dropping ALL indexes from a database / not just a table?Nunzio Daveri11 Aug