Hi,
Imagine the scenario of the following happening in quick succession:
user1: select * from table --- ticks away, doing the select
user2: select * from table --- also ticks away
user3: insert into table ... --- locked!, waiting for selects
to finish, so as not to disrupt them
user4: select * from othertable --- ticks away, doing the select
user4: select * from table --- locked!, has to wait for
insert to finish, because result will depend on what the insert does
This is why the later select (#13) is locked.
Regards
Quentin
-----Original Message-----
From: Justin [mailto:[EMAIL PROTECTED]]
Sent: Friday, 9 March 2001 2:45 p.m.
To: [EMAIL PROTECTED]
Subject: locking oddity
Hi,
Can someone explain this?
| 13 | XX | chrome | XX | Query | 1 | Locked | SELECT name FROM users WHERE
uid=288950 |
| 376 | XX | chrome | XX | Query | 1 | Sending data | SELECT uid FROM users
WHERE name like '%Fuzzster' limit 1 |
| 397 | XX | chrome | XX | Query | 1 | Locked | SELECT uid,flags,aseclev,
... etc
| 479 | XX | blue-private | XX | Query | 0 | NULL | show processlist |
| 542 | XX | chrome | XX | Query | 1 | Locked | update users set
lllogin=llogin,visits=visits+1,llogin=NOW() where uid=333705 |
I removed all the sleeping processes from the processlist
* connection #397 is 'sending data' from a select. Fine.
* connection #542 (an update) is "Locked" on that. Fine.
* But ... why is connection #13 (another select) locked???
And .. other examples show any other new selects also lock
when there that or other pending locked updates are waiting...
at least this is my interpretation..
-Justin
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