optimize table

ThinkPHP permission authentication Auth instance details, thinkphpauth This article provides an in-depth analysis of the implementation principles and methods of ThinkPHP permission authentication Auth in the form of instance code. The specific

This article mainly introduces MySQL database optimization, including MySQL database performance optimization, this article describes the optimization of common SQL statements and the actual operation solution for MySQL database to optimize the

View database status:service mysqld Status Start database:service mysqld start Access to the database:mysql-u root-p123456; List database: showdatabases; Select database: UsedatabaseName; List table: showtables; Displays the properties of the

Database optimization techniques, what do you do: · Use a persistent connection database to avoid connection overhead. If you cannot use a persistent connection and you are starting many new connections to the database, you may want to change the

Task backgroundReceived Kingsoft alarm text message, said a database capacity has reached 90% of the watermark, so log on to the console to see the details.When the console first discovers that the disk capacity of each day does fluctuate, it proves

Method 1,Analyze table:This statement is used to analyze and store the keyword distribution of a table. During parsing, the table is locked with a read lock. This is useful for MyISAM, BDB, and InnoDB tables.Method 2,CHECK TABLE:Check if one or more

1. How to log into MySQL databaseMysql-u username-p2. How to turn on/off MySQL serviceService MySQL Start/stop3. Check the status of MySQLService MySQL Status4, how to display a number of all databasesShow databases5. How to get the names and types

The storage engine in the database is actually a set of tables that use the engine, and the table in the database sets what storage engine, so the table has different "effects" in terms of how the data is stored, how the data is updated, the

Performance optimization is done by some effective means to improve the speed of MySQL, reduce the amount of disk space occupied. Performance optimizations include many aspects, such as optimizing query speed, optimizing update speed, and optimizing

?Directoryfirst, the Common Database optimization method: ???? 1second, improve efficiency, anti-three paradigms: ???? 1First Paradigm: ???? 1Second paradigm: ???? 1The third paradigm: ???? 1inverse three-paradigm design: ???? 2third, positioning

How MySQL improves the speed of bulk importA recent project test, there are several MySQL database table data records reached hundreds of thousands of, in the building test environment to import test data, very slow.Search on the Internet, there are

1. To optimize the query, avoid full-table scanning as far as possible, and first consider establishing an index on the columns involved in the Where and order by.2. You should try to avoid null values in the WHERE clause, otherwise it will cause

1. To optimize the query, avoid full-table scanning as far as possible, and first consider establishing an index on the columns involved in the Where and order by.2. You should try to avoid null values in the WHERE clause, otherwise it will cause

1. How to log in to MySQL databaseMysql-u username-p2. How to turn on/off MySQL serviceService MySQL Start/stop3. Check the status of MySQLService MySQL Status4, how to display the number of all databasesShow databases5. How to get the names and

MySQL free spaceSome tables in the production system use Delete to delete some rows and find that the space is not releasedReason: The principle of high water mark generation by analogy with OracleWorkaround:1. Execute OPTIMIZE table name;Attention:1

The following article mainly describes the MySQL database simple and practical optimization of the implementation of the specific methods, including how to regularly analyze and check the table, and how to properly optimize the table, the following

1, to optimize the table 2, Analysis of the table (analysis and storage of MyISAM and BDB table in the distribution of keys) 3, check the table (check the table error, and update the key for the MyISAM statistics) 4, repair the table (repair the

Process with analyze and deal with them on a regular basis ANALYZE [Local | No_write_to_binlog] TABLE tb1_name[, Tbl_name] ... Define Tables Analyze Table table_name CHECK TABLE Tb1_name[,tbl_name] ... [option]...option = {QUICK | FAST | MEDIUM |

Delete Grammar Single table Syntax: DELETE [low_priority] [QUICK] [IGNORE] from Tbl_name[WHERE Where_definition][Order BY ...][LIMIT row_count] Multiple table syntax: DELETE [low_priority] [QUICK] [IGNORE]TBL_NAME[.*] [, tbl_name[.*] ...]From

1. To optimize the query, avoid full-table scanning as far as possible, and first consider establishing an index on the columns involved in the Where and order by.2. You should try to avoid null values in the WHERE clause, otherwise it will cause