[Snort-users] Database performance question (MySQL or PostgreSQL?)

Dave Ellingsberg dave.ellingsberg at ...6923...
Fri Sep 26 09:14:20 EDT 2003

We have 300,000-500,000 alerts in the ACID database at any one time, but
we have quite a bit more hardware. (4x1G Sparc procressors & 4G RAM).
Default ACID home page loads < 10 seconds. We added 5-6 more queries to
the home page & now it loads in 12 sec or so.

MySQL tuning makes big difference. We were at 5-10 minutes to load the
home page before we:

1) Followed MySQL's tuning documentation.
2) Started archiving old events (we had 2 million events in ACID).
3) Started runnining 'optimize table' regularily.


>>> Jyri Hovila <jyri.hovila at ...2940...> 9/26/2003 2:24:14 AM >>>

Please let's not let this turn this into SQL wars. =)

I'm sure this issue has been discussed several times before but I'm
unable to find anything about it in the snort-users archives.

I'm currently running several Snort sensors with a central MySQL
database. Recently the database speed has become a problem. When the
number of alerts is starting to reach 100 000, ACID is starting to get
slow. Add another 100 000 alerts and ACID is almost unusable.

My database server is not doing anything else but running MySQL and
ACID. Here are the specs:

- Pentium II 450 MHz (normally almost totally idle, jumps to 80% when
making SQL queries)

- 384 RAM (about 50% used, jumps to 60-70% when making queries)

- 7200 RPM IDE HD (yes, I know...)

As CPU and RAM utilization is almost never higher than 80% and still
queries take awfully long to finish, could the HD be a problem?

I remember seeing discussions about differences between MySQL and
PostgreSQL performance. If I remember correctly, PostgreSQL was
to be somewhat faster. Could anybody with some real life experience on
this issue share hers/his knowledge?


- Jyri

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