sid in

When you use the explain tool to view the execution plan of the SQL statement, if ldquo; DEPENDENTSUBQUERYrdquo; appears in the select_type field, you must note that you have When you use the explain tool to view the execution plan of the SQL

Manufacturing deadlock Create Environment Create table t1_deadlock (a int );Create table t2_deadlock (a int ); Insert into t1_deadlock values (1 );Insert into t2_deadlock values (2 ); -- Step 1Update t1_deadlock set a = 1000 where a = 1;   -- Step

The undo mechanism is a clever feature of Oracle and one of the difficulties in learning oracle. Next we will learn more about it internally. Session 1: Scott user, initiates a transaction hr@ORCL> conn scott/oracleConnected.scott@ORCL> UPDATE emp

Connect:Another heterogeneous type of Oracle is the general Gateway (also called transparent gateway)A better general gateway than a common link is that it can perform heterogeneous data modification and deletion operations, but it needs to install

A database is a shared resource used by multiple users. When multiple users access data concurrently, multiple transactions can access the same data simultaneously in the database. If concurrent operations are not controlled, incorrect data may be

To count which users are logging on to the database and other purposes, you need to record the information about the database logon and the information about failed attempts to log on to the database, which of the following triggers can be

When a Microsoft Windows NT user or Microsoft Windows NT group adds a login name to Microsoft SQL server, or when the login name of a server in one domain is moved to a server in another domain, you may see the following error: Error 15401: Windows

Oracle Lock Mechanism   A database is a shared resource used by multiple users. When multiple users access data concurrently, multiple transactions can access the same data simultaneously in the database. If concurrent operations are not controlled,

Problem Description: The client front desk applies a certain operation hang live, no error or operation normal end prompt. View the lock information as follows: Sql> with LK as (select Blocking_instance| | '. ' | | blocking_session blocker,

An issue that was encountered following a restore of the database (SQL Server 2008) when the project was recently migrated:msg 10314, Level 16, State 11, line 1ththe Microsoft. NET Framework error occurred while attempting to load assembly ID 65536.

Table structureCREATE TABLE DataSET NAMES UTF8;SET foreign_key_checks = 0;-- ------------------------------Table structure for ' class '-- ----------------------------DROP TABLE IF EXISTS ' class ';CREATE TABLE ' class ' (' CID ' int (one) not NULL

The table structure diagram is as follows:650) this.width=650; "src=" Https://s5.51cto.com/wyfs02/M02/06/89/wKiom1m56N-jqdsBAAB-q8SwhwE496.png "title=" Untitled. png "alt=" Wkiom1m56n-jqdsbaab-q8swhwe496.png "/>To create a table and insert

Case Combing time: 2013-9-25 written in the previous words: In slow-scan optimization 1 and 2 have repeatedly emphasized the importance of explain, but sometimes the naked eye can not see how the explain Results to guide optimization,

When you use the Explain tool to view the execution plan of an SQL statement, you should be aware of the Select_type field when "DEPENDENT subquery" appears. You have fallen into the MySQL sub-query slow "pit" ... Let's look at a concrete

Knowledge about volume El locks 1. view which session locks: SQL statement: select 'alter system kill session ''' | sid | ',' | serial # | '''; 'From v $ session where sid in (select sid from v $ lock where block = 1); SQL> select 'alter system kill

The security group upgrade rule failed error: Rule "Security Group Sid (Security Identifier)" failed was reported in the forum today. This error occurs because the Windows Local Group Sid information created by SQL Server does not match the SID in

The previous article talked about the daily maintenance commands of Linux and the daily maintenance commands of oracle. I believe that Oracle databases must be maintained more or less. Should I import and export Oracle databases? (Oh, you said you

You can use spotlight software to monitor the running status of the database. When a session lock occurs, we need to handle it in time. 1. view which session locks:SQL statement: Select 'alter system kill session ''' | Sid | ',' | serial # | ''';

A database is a shared resource used by multiple users. When multiple users access data concurrently, multiple transactions can access the same data simultaneously in the database. If concurrent operations are not controlled, incorrect data may be

[Slow query optimization] use MySQL subqueries with caution, especially when you see the DEPENDENTSUBQUERY tag bitsCN.com case study: Preface: I have repeatedly stressed the importance of explain in slow query optimization 1 and 2, but sometimes