• Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other Pie Elite all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Jeanne Boyarsky
  • Ron McLeod
  • Paul Clapham
  • Liutauras Vilda
Sheriffs:
  • paul wheaton
  • Rob Spoor
  • Devaka Cooray
Saloon Keepers:
  • Stephan van Hulst
  • Tim Holloway
  • Carey Brown
  • Frits Walraven
  • Tim Moores
Bartenders:
  • Mikalai Zaikin

detecting liveliness of connection

 
Ranch Hand
Posts: 53
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
How can I detect Liveliness of connection object?
The situation is like this. I have a monitor application which needs to monitor the database and some applications which togeather with the database forms a complete system. As soon as the database goes down, monitor application sends signals to other application to shut them down.
The problem is - how can I detect from my monitor application that database is down. The monitoring application also maintains a pool of connection to database for some purpose. Is there some way to use the existing connections to detect the liveliness of database?

Thanks.
 
Ranch Hand
Posts: 387
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
hi Pushker,

you could do a select ... from ... to see if your databse is still up and running (if not you will get an SQL-exception)

Herman
 
Saloon Keeper
Posts: 27817
196
Android Eclipse IDE Tomcat Server Redhat Java Linux
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator

Originally posted by Herman Scheltinga:
hi Pushker,

you could do a select ... from ... to see if your databse is still up and running (if not you will get an SQL-exception)

Herman



... which is basically what the 'keep-alive' logic in the apache dbcp does, if switched on. If the request fails, the Connection is discarded and a new one is obtained. Otherwise the existing Connection is passed out of the pool for the benefit of the user.

I believe a safe, general-purpose test for Oracle is 'SELECT 1 from dual'.
 
Nothing? Or something? Like this tiny ad:
a bit of art, as a gift, that will fit in a stocking
https://gardener-gift.com
reply
    Bookmark Topic Watch Topic
  • New Topic