logo
  • About us
  • Services
  • Products
  • Work
  • Contact

Feedback

In Focus

  • Flash XML slideshow
  • Database training

4.1.22. Lost update

  • T1
  • read_item(X);
  • X=X-N;


  • write_item(X);
  • read_item(Y);


  • Y=Y+N;
  • write_item(Y);
  • T2


  • read_item(X);
  • X=X+M;


  • write_item(X);
  • T1 X update overwritten
‹ 4.1.21. Concurrency issuesup4.1.23. Dirty read (or Temporary update) ›
  • s5 slideshow
 

 

 

Copyright 2007 Lightenna Limited

  • About us
  • Services
  • Products
  • Work
  • Contact