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

Feedback

In Focus

  • Flash XML slideshow
  • Database training

4.1.24. Incorrect summary

  • T1

  • read_item(X);
  • X=X-N;
  • write_item(X);

  • read_item(Y);
  • Y=Y-N;
  • write_item(Y);
  • T2
  • sum=0;
  • read_item(A)
  • sum=sum+A;

  • read_item(X);
  • sum=sum+X;
  • read_item(Y);
  • sum=sum+Y;
  • T2 sums after X-N and before Y-N
‹ 4.1.23. Dirty read (or Temporary update)up4.1.25. Serializability ›
  • s5 slideshow
 

 

 

Copyright 2007 Lightenna Limited

  • About us
  • Services
  • Products
  • Work
  • Contact