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oracle 事务控制、数据并发性和一致性(Oracle transaction control, data concurrency, and consistency)
oracle 事务控制、数据并发性和一致性(Oracle transaction control, data concurrency, and consistency)
Oracle 2, 5 transaction control, data concurrency and consistency - wenyuanyuan6086 log - NetEase blog
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Log emperor two uncle Introduction marriage, Oracle 2, 5 transaction control, data concurrency and consistency, 2009-05-13 09:19 classification: learning Name: big, medium, small
2, 5, 1 transaction control
1, a set of DML statements that constitute a logical unit of work is called a transaction.
2, if there is no transaction mechanism, Oracle cannot guarantee the correct change of database data and users read-write consistency. A transaction
Can be a set of DML statements that modify data, or a DDL or DCL command. The transaction starts with the first executable statement and meets
Case ends: the commit or rollback statement, DDL, or DCL statement commits the transaction automatically (including the DML command before it is submitted),
User exits (system automatically issues commit command), system crashes.
3, transactions are generated from two different elements in the Oracle database. The first element is a set of commands that define the beginning, breakpoint, and end of the transaction.
The second element is the locking mechanism that prevents multiple users from changing the row information in the database at the same time.
4, if the current transaction is incorrect, you can use commit to end the current transaction. After the commit is issued, the data in the roll segment is released
The other user can see the modified new data, and the command releases the locked locks and starts a new transaction. Prior to commit submission
Before the data is stored in the scroll sect
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