| 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 |
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| 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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