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Re: [PHP] LOCKS???




On Sun, Nov 27, 2016 at 07:59:58PM -0500, Aziz Saleh wrote:

> On Sun, Nov 27, 2016 at 6:37 PM, Tedd Sperling <tedd.sperling@xxxxxxxxx>
> wrote:
> 
> > Hi gang:
> >
> > I’ve read a bunch about MYSQL LOCKs, but I can seem to get them to work.
> >
> > For example, I have two computers accessing the same host (i.e., thus each
> > with different SIDs) and accessing two different scripts. One script
> > performs a "LOCK TABLES t WRITE" and the second script tries to read TABLE
> > t. While the LOCK is in place, the second script has no problem reading and
> > writing to TABLE t.
> >
> > I don’t understand what's wrong — any ideas?

[snip]

> You are running a LOCK on writes, not reads, so the second script is
> performing fine.
> 
> Also you don't need multiple sessions to test LOCK mechanism, should be
> able to test it with just 1 session.
> 
> http://dev.mysql.com/doc/refman/5.7/en/lock-tables.html

Read what Tedd wrote again. The second script is reading and WRITING to
the tables.

Paul

-- 
Paul M. Foster
http://noferblatz.com
http://quillandmouse.com

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