unrepeatable read

基本解釋

An unrepeatable read and phantom read can occur.
會發(fā)生不可重讀和幻像讀。
An unrepeatable read, phantom read, and reads of uncommitted data can occur.
會發(fā)生不可重讀、幻像讀和讀未提交數(shù)據(jù)。
An unrepeatable read can occur when the transaction reads some data again and finds that it changed since the last read due to another transaction that modified this data and committed.
事務再次讀取某數(shù)據(jù)時發(fā)現(xiàn)它自最后一次讀操作之后由于另一個事務修改并提交了該數(shù)據(jù)而發(fā)生了更改，則會發(fā)生不可重讀。