Erlang and Oracle

Sean Hinde <>
Tue Feb 25 19:39:37 CET 2003


Shawn,

I started a native oci driver a couple of years back. Then mnesia got better
at large databases and I kind lost the will to do C.

There was also a bug in the OCI library that it would dump core if you ever
tried to close down the reference to it (Oracle accepted this as a known bug
and proposed a workaround of setting some environment variable which
prevented ever unloading a shared lib. About a year later they mailed me to
say the the bug report had been updated but I had forgotten my support
password and never looked it up).

The current state is that I got half way through implementing some new thing
and never finished it, it might not even compile anymore.. If you want it
then you can have it, and I can try to help explain how it was supposed to
work..

When it worked it was really fast :-)

Sean

> -----Original Message-----
> From: Shawn Pearce [mailto:]
> Sent: 25 February 2003 18:27
> To: 
> Subject: Erlang and Oracle
> 
> 
> I almost have my team ready to dive into Erlang as the backbone of
> our server.  Erlang fits our problems perfectly as far as its
> concurrency features go, better than anything else we've tried to
> do in Java and JNI.  One problem.
> 
> We need to talk to Oracle.
> 
> The last time I saw Erlang talking to Oracle was either the researchy
> OraErl project (won't cut it for us) or the Erlang/ODBC driver, which
> is only available on Windows (we want to run on Solaris or Linux).
> 
> Do the Erlang masters have any recommendations?
> 
> Or do we have to abandon all hope?  :-(
> 
> I've come up with a few possibilities thus far:
> 
> 	- About two years ago I had written a decent 
> Erlang<->JDBC binding
> 	  by using JInterface to send and receive messages through
> 	  to Java.  Java threads acted as "database connections"
> 	  for Erlang and sent everything through JDBC.  It was
> 	  slower than I would like now, but allowed me talk to Oracle
> 	  and provide nice mapped associations like using the Erlang
> 	  atom 'undefined' for SQL NULL in the database.
> 
> 	- Write a SQL Relay (http://sqlrelay.sourceforge.net/) client
> 	  in Erlang and use SQL Relay to access Oracle.
> 
> 	- Write an Erlang port program to use OCI8 and connect 
> to Oracle.
> 
> 	- Use XML-RPC to talk to something that can talk to Oracle.
> 
> I need the Erlang<->Oracle stuff up as fast as possible for this to
> work. :-(
> 
> With the size of of the data we have to manage, Mnesia is out.  We're
> dealing with about .5 TB now and will be growing it over the next year
> to 1 TB and possibly higher.  (We just ordered our second 1 
> TB database
> server.)
> 
> -- 
> Shawn.
> 
>   Water, taken in moderation cannot hurt anybody.
>   		-- Mark Twain
> 



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