wht is mean by dirty read?
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Answer / g.arun
Dirty read - Changes made during a Transaction is 'visible'
to other parties
Non Repeatable Read -
if Transcation T1 reads a row and Transcation T2 changes
the same row,when T1 rereads and sees the changes made by
T2.Then this is Non - Repeatable Read
Phantom Read - If Transcation T1 retrieves a bunch of
rows.Transcation T2 inserts a row,T1 rereads the query and
if T1 see the additional row,it is a ghost row to T1 then
this is called as Phantom Read
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