It doesn't matter what db - and whether you wrap it in eval it is a problem
(postgres has a similar problem - the one with least problems is MySQL) - if
you have a secure environment where your databases are in a firewalled zone it
will happen to all of them... It's a nasty bit of networking - it does mean our
meant to be secure enterprise level apps running against Oracle and less secure
and less stable than the other apps we have (go figure!)...
-----Original Message-----
From: Vincent Veyron <vv.li...@wanadoo.fr>
Sent: 09 February 2021 17:47
To: modperl@perl.apache.org
Subject: Re: Moving ExecCGI to mod_perl - performance and custom 'modules' [EXT]
On Sun, 7 Feb 2021 20:21:34 +0000
James Smith <j...@sanger.ac.uk> wrote:
Hi James,
> DBI sharing doesn't really gain you much - and can actually lead you into a
> whole world of pain. It isn't actually worth turning it on at all.
>
Never had a problem with it myself in years of using it, but I wrap my queries
in an eval { } and check $@, so that the scripts are not left hanging; also I
have a postgresql db ;-).
I ran some tests with ab, I do see an improvement in response speed :
my $dbh = DBI->connect()
Concurrency Level: 5
Time taken for tests: 22.198 seconds
Complete requests: 1000
Failed requests: 0
Total transferred: 8435000 bytes
HTML transferred: 8176000 bytes
Requests per second: 45.05 [#/sec] (mean)
Time per request: 110.990 [ms] (mean)
Time per request: 22.198 [ms] (mean, across all concurrent requests)
Transfer rate: 371.08 [Kbytes/sec] received
my $dbh = DBI->connect_cached()
Concurrency Level: 5
Time taken for tests: 15.133 seconds
Complete requests: 1000
Failed requests: 0
Total transferred: 8435000 bytes
HTML transferred: 8176000 bytes
Requests per second: 66.08 [#/sec] (mean)
Time per request: 75.664 [ms] (mean)
Time per request: 15.133 [ms] (mean, across all concurrent requests)
Transfer rate: 544.33 [Kbytes/sec] received
--
Bien à vous, Vincent Veyron
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