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CHEMS 2013 SYSTEM ARCHITECTURE. Best Western Green Bay. CHEMS SYSTEM ARCHITECTURE. COUNTY CLIENT PC. INTERNET. DOT SERVER MACHINES (BITS). PROD #1. OP08. CLOUD. CHEMS. PROD #2. APPLICATION SERVERS. ORACLE DATABASE. COUNTY PC. Relatively Current Windows PC

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chems 2013 system architecture

CHEMS 2013SYSTEM ARCHITECTURE

Best Western Green Bay

chems system architecture
CHEMS SYSTEM ARCHITECTURE

COUNTY CLIENT PC

INTERNET

DOT SERVER MACHINES (BITS)

PROD #1

OP08

CLOUD

CHEMS

PROD #2

APPLICATION SERVERS

ORACLE DATABASE

county pc
COUNTY PC
  • Relatively Current Windows PC
    • Typically Windows XP, 7 or 8 possibly
    • Installed and configured Internet Explorer (IE 10 OK)
    • Faster is always better, if it’s slow CHEMS will be slow
  • CHEMSPRO.EXE (Only thing needed)
    • Install the CHEMSPRO.EXE on your machine
    • Different install options to meet varying county security needs
internet
INTERNET
  • Reliable / Decent Internet Connection Required
    • Faster is better here too, in terms of mb/sec
      • Minimum – 1.5 x 1.5 ( Shared Courthouse link )
      • Better – 10 x 3 ( typical in standalone Depts )
      • Best – 50+ x 50+ ( fiber in some counties, DOT side is fiber )
      • Ping times matter too, average of about 30 msec or less is OK
    • Shared lines can saturate dropping your speed to less than a dialup
      • CHEMS won’t work right, even web pages appear to be failing
chems system architecture2
CHEMS SYSTEM ARCHITECTURE

DOT SERVER MACHINES (BITS)

PROD #1

OP08

PROD #2

APPLICATION SERVERS

ORACLE DATABASE

dot machines
DOT MACHINES
  • Application Servers
    • Prod #1 and Prod #2 are two identical physical application servers
      • Quad Core Pentium 4, 32GB ram, IBM Blade servers
    • Redundant - Sized so that one server can handle all of the load
    • Balanced – Monthly the traffic to each app server is about the same
    • BITS manages the hardware, I manage the CHEMS server software
dot machines1
DOT MACHINES
  • CHEMS Server Software (on each physical server)
    • IIS web services handles requests (SSL) coming in from your PC
    • Your request is directed to either a DATA or REPORT ‘app’ server
    • The DATA and REPORT servers communicate with the Oracle database
    • DATA server program requests are passed back to your PC
    • REPORT server program requests generate report pages on the server
      • Rendered reports are then passed back to your PC
dot machines2
DOT MACHINES
  • Oracle Database
    • 11g running in a Unix Cluster managed by a group DOT Oracle DBA’s
    • DOT follows a ‘by-the-book’ development practice
      • Developers can NOT make direct changes to PROD or TEST
      • SQL Code mods are allowed only in DEV, no tables or new code
      • I submit requests for a change to the database, tables or code
      • It’s reviewed, potential impacts, approved, and done by the DBA’s
summary
SUMMARY
  • CHEMS is a client/server based system utilizing a ‘Fat’ (EXE) client to provide the required functionality.
  • Because it’s client/server the amount of bandwidth required is kept to a minimum. (keyed data and report pages)
  • Windows compliant, reports come off faster and data entry is similar to AREV CHEMS even though it’s Windows based.