lock timeout

When using MySQL, we sometimes encounter such an error: "Deadlock found when trying to get lock; Try restarting transaction ".In 14.5.5.3 how to Minimize and Handle deadlocks There is such a sentence: Deadlocks is not dangerous. Just try

Do development time a table how also can not open, data also not many, on-line check the following this article perfect solution, but remember to log in with the root MySQL: MySQL Waiting for table metadata Lock resolution methodoriginal March 29, 20

1, according to HOST_NAME request session_id inquirySelect db_name host_name from innerjoinon t1.session_id =t2.session_id where host_name= ' zhangshulei-'Search results:2, according to SESSION_ID query data connection situation, statusSelect

General countersCollects server performance information for operating system servers, including processor, disk, network, memoryProcessor Processor1.1% Processor time refers to the percentage that the processor uses to perform non-idle threads. This

MySQL Management: Performance tuning, high availability and monitoring mini-bookmysql5.5.x Main Improvements1. Use InnoDB storage engine by default2. Make full use of CPU multi-core processing capability3, improve the number of brush write dirty

--------------------------------------------------------------------------Author:happyflystone--Date:2009-10-21--Version:microsoft SQL Server 2005-9.00.2047.00 (Intel X86)-APR 14 2006 01:12:25--Copyright (c) 1988-2005 Microsoft

1,5.5 default storage engine is InnoDB2, 5.5 increase CPU multi-core processing capacity: Innodb_read_io_threadsInnodb_write_io_threads3,5.5 Improving Disk IOIncrease the number of dirty page brushes added and merged insert quantity:

1ObjectiveThe database large concurrency operation takes into account the deadlock and lock performance issues. See online most vague (especially update lock), so here is a concise explanation, for the following description of the convenient, here

General countersCollects server performance information for operating system servers, including processor, disk, network, memoryProcessor Processor1.1% Processor time refers to the percentage that the processor uses to perform non-idle threads. This

This paper mainly explains the use of the three lock variables db2_evaluncommitted,db2_skipdeleted and db2_skipinserted in DB2Lab Environment:DB2 v9.7.0.6AIX 6.1.0.0using the default isolation level CSDDL and initial contents of the student

recently in a long database merge script, you want to merge table data from multiple sub-databases into one primary database. Here are the mistakes I made when I wrote the data correction script. Unnecessary queriesTake a look at the following

October 13, 2010 12:46 Source: Ministry of Matsumasa's blog Department Matsumasa Editor: Huminya　　A: Below with AdventureWorks2008 for the sample database to do a brief description , filter out the general database of shared locks, as an example

1.1,MySQL 's logical architecture the schema is as follows: Storage Engine : Responsible for the storage and extraction of data, dozens of APIs for the service layer to call. There is no interaction between the various storage engines, just for

first, the use of Pg_dump:Import and export of databases is one of the most commonly used features, each of which provides tools for this, such as Oracle's Exp/imp,informix Dbexp/dbimp,mysql mysqldump, and PostgreSQL provides a corresponding tool

Create a database domain linkEXEC sp_addlinkedserver@server = ' Caron ',-----aliases@srvproduct = ' ',@provider = ' SQLOLEDB ',@datasrc = '. ' ----Server NameLogin Domain Linkexec sp_addlinkedsrvlogin ' Caron ', ' false ', NULL, ' sa ', ' Sasa

/*The so-called "blocking" refers to a transaction in a database session that is locking resources that other session transactions want to read or modify.Causes requests made by these sessions to enter a waiting state. SQL Server defaults to allow

Select App_name () as W--the current session of the applicationSELECT @ @IDENTITY--Returns the last inserted identity value Select USER_NAME ()--Returns the user database user nameSELECT @ @CONNECTIONS-Returns the number of connections or attempts

1. Deadlock PrincipleAccording to the definition in the operating system: A deadlock is a permanent wait state in which each process in a set of processes occupies a resource that is not freed, but is placed in a form that is not freed by other

In the previous article I discussed the latch in SQL Server. At the end of the article I gave you a brief introduction to the next spin lock (Spinlock). Based on that foundation, today I'll continue to discuss spin locks in SQL Server and show you

Read-uncommitted (read not submitted)Testing process:1, a set read-uncommitted, start transaction2, b Execute Start transaction, modify a record,3, a query record, got the correct record4, b rollback.Problem: A reads a record of B without committing,