InnoDB shared lock with JOINs

2002-12-05 Thread Evgeny Chuykov 
Hallo.

I have this query:
  SELECT table1.id
  FROM table1
  LEFT JOIN table2 USING(id)
  WHERE table1.a=1 and table2.b=1

table1 is MyISAM and table2 is InnoDB.
I want a shared mode lock on the table2. Is it possible, or i should
split this query?

-- 
Have a nice day.


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Re: InnoDB shared lock with JOINs

2002-12-05 Thread Heikki Tuuri 
Evgeny,

- Original Message -
From: Evgeny Chuykov [EMAIL PROTECTED]
Newsgroups: mailing.database.mysql
Sent: Thursday, December 05, 2002 12:28 PM
Subject: InnoDB shared lock with JOINs


 Hallo.

 I have this query:
   SELECT table1.id
   FROM table1
   LEFT JOIN table2 USING(id)
   WHERE table1.a=1 and table2.b=1

 table1 is MyISAM and table2 is InnoDB.
 I want a shared mode lock on the table2. Is it possible, or i should
 split this query?

I think LOCK IN SHARE MODE will work, if you want to lock the rows in table2
which the join touches.

But better test it with 2 connections.

 --
 Have a nice day.

Best regards,

Heikki Tuuri
Innobase Oy
---
InnoDB - transactions, row level locking, and foreign key support for MySQL
See http://www.innodb.com, download MySQL-Max from http://www.mysql.com

sql query




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