Some of us are not aware of the tremendous job databases perform, particularly their efforts to maintain the Isolation aspect of ACID. For example, some people believe that transactions are only related to data manipulation and not to queries, which is an incorrect assumption. Transaction Isolation is all about queries, and the consistency and completeness of the data retrieved by queries. This is how it works: Continue reading

It is known that "+" sign cab be used to create unlimited virtual gmail addresses using one box! For example you have mailbox  user@gmail.com, all addresses user+ANY_WORD@gmail.com are valid and will be delivered into your mail box. Good usage for this is leave not your direct email on site signups but something like user+spam@gmail.com, which can be filtered later.   For another cool address tweak see sub cat.. Continue reading