set autocommit

The following articles mainly introduce the most simple and practical Optimization Methods for MySQL databases, including the discussion on Performance of MySQLInnoDB and the performance optimization of MySQL databases. The following describes the

Php combines mysql with mysqli to expand the transaction processing method, mysqlmysqli This example describes how php combines mysql with mysqli extension to process transactions. We will share this with you for your reference. The details are as

After the mysql innodb row lock is unlocked, the result is 1213 dead, like Deadlock found when. To solve this problem, remember that innodb row locks and locks are for primary key indexes. If the table is locked Based on the index during the query,

MySQL common SQL optimization statements insert data in large batches. 1. For tables of the Myisam type, you can import a large amount of data quickly using the following methods. Alter table tblname disable keys; loading the dataALTER TABLE tblname

The following articles mainly describe how to implement simple and practical MySQL database optimization methods, including how to regularly analyze and check tables and how to optimize tables on a regular basis, the following is a description of

There are two main methods to process MYSQL transactions.1. Use begin, rollback, and commit to implement Start a transactionRollback transaction rollbackCommit transaction validation2. directly use set to change the mysql automatic submission Mode

Online modification of table object structure: Before MySQL5.6 1. Create a temporary table with the same structure as the original table object (invisible to users in implicit operations) and structure the table Online modification of table object

Mysql Note 1. Disable query cache. query_cache_size = 0. 2. Innodb tables are saved in the order of primary keys. Therefore, sorting imported data in the order of primary keys can effectively improve the efficiency of data import. 3.

The MySQL transaction should be defined by every MySQL database user. The following describes how to define MySQL transactions, which is helpful to you. By default, MySQL runs a COMMIT statement after each SQL statement is executed to effectively

Analysis of MYSQL REPEATABLE-READ isolation level, repeatableread The REPEATABLE-READ can be read repeatedly, and the contents of the select table in the set autocommit = 0 or start transaction state will not change. This isolation level may cause

1. To support transactions within the program, the first connected database and data table must support the transaction MySQL for example:Database InnoDB Support TransactionsData table Support transactions: InnoDB support Transaction2. Framework

1. To support transactions within the program, the first connected database and data table must support the transaction MySQL for example: Database InnoDB Support Transactions Data table Support transactions: InnoDB support Transaction 2.

MySQL experience 10-1 -- Transaction bitsCN. comMySQL experience 10-1 -- Transaction 1. in the MySQL environment, a transaction is composed of one or more SQL statements as a single unit. Each SQL statement in this unit is mutually dependent, and

: This article mainly introduces thinkphp's transaction rollback process and the original PHP transaction rollback instance. if you are interested in the PHP Tutorial, refer to it. 1. to support transactions in the program, the connected database

Mysql table optimization: 1. Analysis Table 2. Check Table 3. Optimization Table 4. table data import 5. lock table operation 1. Analysis Table 11. Command: ANALYZE [NO_WRITE_TO_BIN Mysql table optimization Brief: I. Analysis Table II. Checklist III.

Mysql table lock statement bitsCN.com The mysql table lock statement first looks at the table structure, engine innodb + ---- + ---------- + ------ + | id | name | seat | + ---- + ---------- + ------ + | 1 | administrator | 98 | 2 | maintenance

Now all the content in the CSV file needs to be read and inserted into the database Reply content: Now all the content in the CSV file needs to be read and inserted into the database You refer to Phpexcel This class library to see $file = fopen ('

If you want to use PHP to create a web page with questions, you don't know how to start with it. Before that, you have made a simple upload, but there are only a few thousand pieces of data. now you have to process millions of data imports, how to

Introduction: Mycat has become a powerful open source distributed database middleware product. In the face of enterprise application of massive data transaction processing, is currently the best open source solution. However, if you want to keep the

1 problem description:The following is a graph of the number of threads after the application goes online: Observe the number of threads: increase from 0.2k to 1.4 k, and then suddenly change to 0.2 k. All the added threads are Damon threads.Have