| From: | Florian Weimer <fw(at)deneb(dot)enyo(dot)de> | 
|---|---|
| To: | "Mark Woodward" <pgsql(at)mohawksoft(dot)com> | 
| Cc: | pgsql-hackers(at)postgresql(dot)org | 
| Subject: | Re: [OT] MySQL is bad, but THIS bad? | 
| Date: | 2006-05-18 05:18:53 | 
| Message-ID: | 87u07nuczm.fsf@mid.deneb.enyo.de | 
| Views: | Whole Thread | Raw Message | Download mbox | Resend email | 
| Thread: | |
| Lists: | pgsql-advocacy pgsql-hackers | 
* Mark Woodward:
> "On the other hand, you shouldn't use mysql_use_result() if you are doing
> a lot of processing for each row on the client side, or if the output is
> sent to a screen on which the user may type a ^S (stop scroll). This ties
> up the server and prevent other threads from updating any tables from
> which the data is being fetched."
>
> How do busy web sites work like this?
Any system based on locking exhibits this problem.  Even with MVCC,
you can run into it if you've got multiple writers.  As a rule of
thumb, I never perform network I/O within transactions which update
the database (or "read the database", for systems without MVCC).
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