Transaction Terms

 <     >  Configuration Start Transaction Table of Contents

 

Dirty Read: Transaction 1 changes a row. Transaction 2 reads the changed row before transaction 1 commits the change. If transaction 1 rolls back the change, transaction 2 will have read a row that is considered to have never existed.

Nonrepeatable Read: Transaction 1 reads a row. Transaction 2 updates or deletes that row and commits this change. If transaction 1 attempts to reread the row, it will receive different row values or discover that the row has been deleted.

Phantom: Transaction 1 reads a set of rows that satisfy some search criteria. Transaction 2 inserts a row that matches the search criteria. If transaction 1 re-executes the statement that read the rows, it receives a different set of rows.

Copyright 2000-2020 Micro Focus or one of its affiliates.