2012/10/08 14:52 -0700, Rick James
Do not use + for DATE arithmetic!
Use, for example
+ INTERVAL 1 YEAR
No, those operations are well defined. Amongst the timestamp-functions there is
constant reference to numeric context, and character context--and well there
is, because there are no
Hi MySql,
Since upgrading to 5.5.27 (5.5.27-ndb-7.2.8-cluster-gpl-log to be exact)
I have experienced problems with the query cache. I am wondering if I
am the only one?
Twice I have had a core-dump (show at end of mail) on two separate
servers running this version.
Now I had a complete
You are forcing mysql to do full table scans with the substr...
Use explain to see that you aren't using any index.
Avoid the use of substr in the where clause, by splitting your data, index
that field and do you query over that field.
That is why your query is so slow.
the slow insert, is
As for the crash, I don't know. Instead, I recommend either shrinking the size
(if you use a big QC) or turning it off. This would make the issue go away.
ANY modification to a particular table leads to ALL entries in the Query cache
being purged. For that reason, we (Yahoo) almost never use
When creating the temp table, add another column, isn2, that is SUBSTR(ISN, 2).
Add
INDEX(isn2, type)
Change the query to...
isn2 = ' isn ' ORDER BY type LIMIT 1
It that does not work, please provide clearer details, including
SHOW CREATE TABLE
SHOW TABLE STATUS
EXPLAIN SELECT (with
Hi All,
How to monitor individual session number of rows selected or updated by
sessions, number of bytes sent and reviewed by session in a given time period,
sessions connects runs command and then disconnects, SHOW GLOBAL STATUS is not
helping me in this case as i want low level session
Tello is right ! Moreno, and I sugest that: if you want query by
SUBSTR(ISN,2) ,you should create a field named like isnInfo, and
save SUBSTR(ISN,2) to this filed when you insert . don't forget create a
index on this field .
于 12-10-9 下午10:04, Andrés Tello
