On Tuesday, March 28, 1995 at 11:30:29 am CET,
Jeff Kell <[log in to unmask]> wrote:
>I'm a little apprehensive about the startup/load/DBOPEN/etc overhead
>with this though, but I don't see any obvious way to clean it up given
>that the Web server will create a new instance of the cgi-bin process
>for each transaction.  Maybe IPC files(?)...
>
>[\] Jeff Kell, [log in to unmask]
>
 
I must confess I am not very familiar with image. This is unusual for
a HP3000 user, but we are using MINISIS a relational DBMS for textual
information. We have written a 'MINISIS query-server' to get access to
data base information from a WWW browser. MINISIS is not a standard SQL-data
base. Constructions like join or view in standard SQL have to be explicitly
opened as a DB. This means a considerable overhead if we would do this for
every 'stateless query'. We have solved this by running a daemon, (e.g.
MPE-job) for every DB (view or join) that can be queried. The CGI process
writes the query to a message file, gives the name of the message file it
wants to read the result from and starts to try reading this file. The
DB-server performs the query on the data base, and writes it to the specified
message file. After the cgi process has read the result and passed it to the
HTTPD proces it is killed. The DB-server however is there all the time and
the DB is always open.
I don't know if this concept can be used for an image data base.
Our WWW server with db access on a HP3000 can be visited. The DB-server is
still under construction, but can be queried. For the moment there's a data
base on ornamental trees and a very small subset of our library catalog.
(URL: http://www.bib.wau.nl)
 
Peter
=============================================================
Drs. Peter J.C. van Boheemen
Head Systems Development and Data Base Management
LIBRARY WAGENINGEN AGRICULTURAL UNIVERSITY/PUDOC-DLO
Jan-Kopshuis, Automation Department
tel: +31-8370-82517                       fax: +31-8370-84761
Email: [log in to unmask]
Snail:Gen. Foulkesweg 19, 6703 BK Wageningen, the Netherlands