Dirty data in dbms and degree of isolation?

Question

hi all i want to know that what actually dirty data means in dbms.

how can be calculate degree of isolation of a transaction(programm)in dbms.

Answer 1

What you probably mean is "dirty read". This is what you can get when using the transaction isolation level 'read uncommitted'. In the same Wikipedia page you will find more information about transaction isolation levels. But be aware that some databases support multi-version concurrency, where things are a bit different.