Hi Brian-
i think the best way to ensure your dates are using YYYY-MM-DD format is for
your dml to reference dates with DATE_FORMAT('YYYY-MM-DD','%Y-%m-%d') e.g.
mysql> select DEIT_EVENT_SEQUENCE_ID,DEIT_EVENT_STATUS_CODE,DEIT_EVENT_DATE
from DEIT;
+------------------------+------------------------+-----------------+
| DEIT_EVENT_SEQUENCE_ID | DEIT_EVENT_STATUS_CODE | DEIT_EVENT_DATE |
+------------------------+------------------------+-----------------+
| 1 | 1 | 2006-09-04
|
| 2 | 2 | 2006-09-05
|
| 3 | 3 | 2006-09-06
|
+------------------------+------------------------+-----------------+
3 rows in set (0.00 sec)
mysql> delete from DEIT where
DEIT_EVENT_DATE<DATE_FORMAT('2006-09-05','%Y-%m-%d');
Query OK, 1 row affected (0.02 sec)
--the record is deleted so lets select to make sure
mysql> select DEIT_EVENT_SEQUENCE_ID,DEIT_EVENT_STATUS_CODE,DEIT_EVENT_DATE
from DEIT;
+------------------------+------------------------+-----------------+
| DEIT_EVENT_SEQUENCE_ID | DEIT_EVENT_STATUS_CODE | DEIT_EVENT_DATE |
+------------------------+------------------------+-----------------+
| 2 | 2 | 2006-09-05 |
| 3 | 3 | 2006-09-06 |
+------------------------+------------------------+-----------------+
2 rows in set (0.00 sec)
hth
Martin Gainty
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> From: [email protected]
> Subject: Best way to purge old records from a huge table?
> Date: Fri, 4 Jun 2010 08:10:07 -0700
> To: [email protected]
>
> Hey all -
>
> I have a table with 12,000,000 records spread over about 6 years. I'm trying
> to delete all but the last 2 years, but no matter how small of a group I try
> to delete at a time, it keeps hanging up the server and I eventually have to
> restart MySQL. The table looks like this:
>
> `creation` timestamp NOT NULL default CURRENT_TIMESTAMP on update
> CURRENT_TIMESTAMP,
> `lat` double NOT NULL default '0',
> `lon` double NOT NULL default '0',
> `referer` int(12) NOT NULL default '0',
> PRIMARY KEY (`referer`,`lat`,`lon`),
> KEY `creation` (`creation`,`referer`)
>
> And the query I've been trying looks like this:
>
> delete from tablename where `creation` < '2006-04-01 00:00:00'
>
> ...trying to do the oldest 1 month of records at a time. So am I just trying
> a really inefficient query? Is there a better way to do this?
> --
> MySQL General Mailing List
> For list archives: http://lists.mysql.com/mysql
> To unsubscribe: http://lists.mysql.com/[email protected]
>
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