1. SQL*NET at F. Hemmer

2. Computers Cray X/MP 48 (UniCOS) IBM 3090/600+6VF (VM/XA) Siemens 7890 (VM/HPO) 200 VAXes, µVAXes and VaxStations (VMS) 30 VAXes, µVAXes and VAXStations (Ultrix) 150 Apollos 10 Suns 1000 IBM PC's (DOS, Xenix) 1200 Macs (MacOS)

3. Protocols TCP/IP, UDP/IP Decnet VTAM, SNA SPX/IPX Appletalk

4. SQL*NET Topology Mac IBM PC Mac Sun IBM PC Mac Apollo Novell Fastpath LEP Apollo RT PC Central VAX/VMS Cluster Central VAX/VMS Cluster IBM 3090/600 6 VF - VM/XA IBM 3090/600 6 VF - VM/XA Siemens 7890 S VM/HPO Siemens 7890 S VM/HPO Ultrix LAVC 8232 3725 3732 IP CTC SNA (LU 6.2) VTAM... Decnet LAVC Ultrix PS Ultrix

5. PC's and MAC's Single user operating system Monotasking operating system Limited (expensive) disk space availabililty Usually no native networking Availability of resource sharing systems Very good dedicated user interface

6. Workstations Multitasking operating system Multiuser operating system Higher disk space availability Native networking Resource sharing by means of standards Good (distributed) windowing interface A lot of CPU dedicated to the user interface

7. Mainframes Multitasking operating system Multiuser time-shared operating system High (cheap) disk space availability No native multi-vendor networking Resource sharing by means of standard protocols Weak user interface Little CPU used for the user interface

8. The LEP Control System LEP SPS Computer Centre PCR Domain Pbar Lab and offices Dev

9. Software Architecture IBM PC/AT PCA Apollo IBM RT PC Application SQL*Net RPC client RPC Servers Application Servers Oracle SQL*Net DataBase Server Oracle Server

10. Problems Client only installations Versions Monitoring Homogeneity Remote IOR

11. SQL*NET Topology Mac IBM PC Mac Sun IBM PC Mac Apollo Novell Fastpath LEP Apollo RT PC Central VAX/VMS Cluster Central VAX/VMS Cluster IBM 3090/600 6 VF - VM/XA IBM 3090/600 6 VF - VM/XA Siemens 7890 S VM/HPO Siemens 7890 S VM/HPO Ultrix LAVC 8232 3725 3732 IP CTC SNA (LU 6.2) VTAM... Decnet LAVC Ultrix PS Ultrix

12. Performance KB ms Decnet Tcp/Ip Local

13. Conclusions Availability Perfomance Better use of computers Client only installations Distributed Oracle not yet mature