「或许这能帮你」——解决Oracle表锁问题技巧分享（oracle锁表了怎么办）

With the increase in the use of Oracle in our daily work, various problems have arisen. Among them, table locking is a major source of problems. Table locking is when a connection has locked a table and other connection cannot access the same table. If table locking occurs, the application system may crash and data may be lost. Therefore, it is necessary to solve the problem of table locking in Oracle.

In Oracle database, table is the basic data structure and its exists are physical, which is responsible for the storage and retrieval of database. When multiple database connections need to access the same database table, table locking occurs. Usually, this situation occurs when there is a competition for a database lock. In this case, one database connection holds a lock on the table and other database connections cannot access the same table.

Here we will discuss some tips for solving Oracle table locking problems. The first tip is to check the locking session, identify the database session that holds the lock, and take appropriate action based on the identification results. In addition, if the table locking is caused by non-transactional operation of a single statement, appropriate lock solutions can be used to avoid table locking. For example, if you need to execute an “UPDATE” statement, you can use “SELECT … FOR UPDATE” statement to lock only those rows that need to be updated.

The second tip is to use the “SELECT … FOR UPDATE SKIP LOCKED” statement. If a row is locked, the operation will ignore the locked row and continue to pull other rows data. It is suitable for scenarios where multiple sessions need to access the same table in parallel. In addition, for scenarios with high lock acquisition frequency, such as stored procedures and batch jobs, it is recommended to use “LOCK TABLE” syntax to explicitly lock table and avoid table locking.

The third tip is to consider using optimistic version control when necessary. In some scenarios, the problem of table locking can be solved by using the logic of optimistic version control. It means that if the row data updated by the user is the same as the data existing in the database before updating, no table locking occurs.

To sum up, understanding the cause of the problem and analyzing the root cause are the most important steps in solving Oracle table locking problems. In addition, making use of the abovementioned tips and techniques can also help you solve the problem more effectively.