What's the best practice to ensure atomic read of a database table using JDBC?

Question

I have an java application reading from a database table for jobs to process, and I may have multiple instances of this application running on different servers as each job is i

Answer 1

if you want to ensure proper work in concurrent environment in your specific example you can use the server name.

The table will look like:

JobID  JobName  Server  Status
-----  -------  ------- ---------
    1  Job_A    host-1  Completed
    2  Job_A    host-2  Working
    3  Job_B    host-3  Working

if you have multiple instances on the same host add the process id too:

JobID  JobName  Server  ProcessID  Status
-----  -------  ------- ---------- ---------
    1  Job_A    host-1  1000       Completed
    2  Job_A    host-2  1000       Working
    3  Job_A    host-2  1001       Working
    5  Job_B    host-3  1000       Working