nowait host

1. The difference between for update and for update nowait:First of all, if only select, Oracle will not add any lock, that is, Oracle to select read the data there is no limit, although it is possible that another process is modifying the data in the table, And the result of the modification may affect the result of your current SELECT statement, but because there is no lock, the select result is the state recorded in the current timetable.If a for update is added, Oracle will not issue the SEL

Http://www.cnblogs.com/quanweiru/archive/2012/11/09/2762223.html 1,for update and for update nowait differences: First of all, if only Select,Oracle will not add any lock, that is, Oracle to Select read the data there is no limit, although it is possible that another process is modifying the data in the table, And the result of the modification may affect the result of your current SELECT statement, but because there is no lock, the Select result is t

Differences between ORACLE for update and for update nowaitI. Differences between for update and for update nowaitFirst, Oracle will not apply any locks if it is only select, that is, Oracle will not impose any restrictions on the data read by select, at this time, another process may be modifying the data in the table, and the modification result may affect the results of your current select statement, but because there is no lock, therefore, the select result is the status recorded in the curr

Original source http://bijian1013.iteye.com/blog/1895412 the difference between the for update and for update nowait First of all, if only select, Oracle will not add any locks, that is, Oracle to select There is no limit to the data read, although it is possible that another process is modifying the data in the table, and the result of the modification may affect the result of your current SELECT statement, but because there is no lock, the select

Original address: http://www.cnblogs.com/quanweiru/archive/2012/11/09/2762223.html1 . The difference between for update and for update nowait: First of all, if only Select,Oracle will not add any lock, that is, Oracle to Select read the data there is no limit, although it is possible that another process is modifying the data in the table, And the result of the modification may affect the result of your current SELECT statement, but because there is n

Translation: MariaDB wait/nowait, mariadbnowait This article is a translation of the mariadb official manual: wait/nowait. Original article: https://mariadb.com/kb/en/library/wait-and-nowait/ Https://mariadb.com/kb/zh-cn/wait-and-nowait/ I submitted to the MariaDB official manual Starting from MariaDB 10.3.0, introduc

The difference between for update and update nowait is the first point. If it is only a select statement, Oracle will not apply any locks, that is, Oracle will not impose any restrictions on the data read by the select statement. Www.2cto.com although another process may be modifying the data in the table at this time, and the modification result may affect the results of your current select statement, but because there is no lock, therefore, the sele

The problem is as follows:Sql> Conn Scott/[email Protected]_databaseConnected to Oracle Database 11g Enterprise Edition Release 11.1.0.6.0Connected as Scott。。。。。。sql> drop table Student2;drop table Student2ORA-00054: The resource is busy, but the resource is specified as NOWAIT, or the timeout expires=========================================================Here's how to fix it:=========================================================Sql> select sessio

This error is also caused by operations on a table, such as update and truncate. In addition, if the transaction is not committed, other operations may also cause this exception. ORA-00054 resource busy and acquire with Nowait specified Cause: the Nowait keyword forced a return to the command prompt because a resource was unavailable for a lock table or select for update command. Action: Try the comma

statements on the same record on a table, the first session is locked on that record, and the other sessions are waiting. When the first session is committed, the TX lock is released and other sessions can be locked. When a TX lock wait occurs on an Oracle database, failure to handle it often causes the Oracle database to hang or cause a deadlock to occur, resulting in ORA-60 errors. These phenomena can cause great harm to the actual application, such as long time not responding, large number o

First, for update and for update nowait is to lock the data rows of the operation and prevent other operations from modifying the data before the transaction commits.The main difference between for update and for update nowait is whether to wait, if not nowait, to give an error when the select is executed, and if a nowait