mysql deadlock detection

This article introduces the solution case of deadlocks caused by loaddata statements in MySQL to coders. it describes some locking mechanisms in the InnoDB engine data table, you can refer to the deadlocks reported by the next online project to briefly describe the causes, solutions, and related points. 1. Background This is a project similar to DATA analysis. DATA is completely imported into an InnoDB table using the load data statement. To facilita

First, the preface MySQL InnoDB, support transaction and row level lock, can use row lock to handle the business such as user's mentioning. The use of MySQL locks sometimes deadlock, to do a good job of deadlock prevention. Second, MySQL row-level lock Row-level locks are

Tags: mysql deadlock unique keyTest environment: MySQL 5.7.18 RR isolation level650) this.width=650; "style=" width:632px;height:261px; "title=" QQ picture 20171027105421.png "Src=" https://s4.51cto.com/ Oss/201710/27/27fa6f262f376b65de32918df8266dfb.png "width=" 741 "height=" 323 "alt=" 27fa6f262f376b65de32918df8266dfb.png "/>Create a table, insert some test dat

If a deadlock occurs, how can this problem be solved? Find the original lock ID and KILL the thread that has been held all the time. But how can we find the thread ID that causes the deadlock among many threads? Since MySQL has developed If a deadlock occurs, how can this problem be solved? Find the original lock ID a

1. Test descriptionEnvironment Description: RHEL 6.4 x86_64 + MySQL 5.5.37, transaction ISOLATION level RCTest table:Mysql> Show CREATE TABLE t1\g*************************** 1. Row *************************** table:t1create table:create Table ' t1 ' ( ' a ' int (one) not NULL DEFAULT ' 0 ', ' B ' int (one) default NULL, PRIMARY key (' a '), key ' B ' (' B ')) Engine=innodb default charset=utf81 row in Set (0.00 SE CTo test the data in the ta

Find the original MySQL deadlock ID. If a deadlock occurs, how can this problem be solved? Find the original lock ID and KILL the thread that has been held all the time. But how can we find the thread ID that causes the deadlock among many threads? MySQL has been very powerf

Tags: mysqlMySQL Deadlock etc 6 combat problems solved Directory: Unlocking after the lock table MySQL connection number is not enough MySQL Root password modification Password is correct but not logged in 0 issues with DateTime types View Table Footprint Unlocking after the lock tableWhen you do a DML operation on a table, it

Use MySQLInnoDB engine lock mechanism to solve deadlocks: When I used Show innodb status to check the engine status, I found a deadlock problem: * ** (1) TRANSACTION: TRANSACTION 0 677833455, ACTIVE 0 sec, process no 11393, OS thread id 278546 starting index read Mysql tables in use 1, locked 1 LOCK wait3 lock struct (s), heap size 320 MySQL thread id 83, query

not locked. The following is the deadlock caused by the MySQL for update. After analysis, MySQL's InnoDB storage Engine practice Lock is a lock line, but it is locked internally, depending on whether the value of the Where condition and select is only primary KEY or Non-key key index to determine how the lock, such as only the primary key, the lock primary key index, if only a Non-key key, then the lock

for a transaction2. Exclusive Lock: X Lock: SELECT * FROM Test where ... for update; An exclusive read-write lock on one row for a transactionTwo1. View the Deadlock log command: show engine InnoDB status \g; Specific deadlock reference: 1190000009469556Session 1:SELECT * FROM test where id = 1 for update;Session 2:Update Test Set name = "QQ" WHERE id = 1;When Session1 and Session2 are running simultaneou

Mysql deadlock caused by full disk Today, I encountered a problem because the disk of the machine where mysql is located is full, leading to a mysql deadlock and not even querying the select statement. If I did not read the mysql

Label:Today, there is a problem, because the MySQL machine's disk is full to cause the MySQL deadlock, even the query select can not, but to look at the MySQL log, I really can not find the reason. By show Processlist you can see that the first is an UPDATE statement that requires writing data because the disk is full

This article mainly introduced the MySQL database lock generation reason and the solution, needs the friend can refer to the nextThe database, like the operating system, is a shared resource used by multiple users. When multiple users access data concurrently, in the database, multiple transactions are generated concurrently to access the same data. If the concurrency operation is not controlled, it is possible to read and store incorrect data and com

Tags: ima commit res foreign thread CTS blog Wait baseReprint Address: http://yueliangdao0608.blog.51cto.com/397025/1180917 If you encounter a deadlock, how to solve it? Find the original lock ID, and then kill the thread that has been holding it, but how many threads can find the thread ID that caused the deadlock? MySQL has evolved to the present, is very stron

This article describes how to find the deadlock ID in the MySQL thread, mainly from the data dictionary. For more information, see. If a deadlock occurs, how can this problem be solved? Find the original lock ID and KILL the thread that has been held all the time. but how can we find the thread ID that causes the deadlock