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The mysqlshow client can be used to see what databases exist, their tables, or a table's columns or indexes.It provides a command-line interface for several SQL SHOW statements.Invoke mysqlshowThe mysqlshow utility can be invoked as shown below −shell> mysqlshow [options] [db_name [tbl_name [col_name]]]Here, If no database is provided, a list of database names are displayed.If no table is given, all matching tables in the database are displayed.If no column is provided, all matching columns and column types in the table are shown.The output displays the names of only those databases, tables, or columns for which the user has certain privileges.Optionsmysqlshow ... Read More
The mysqlpump client utility performs logical backups, thereby producing a set of SQL statements that would be executed to reproduce the original database object definitions and table data. It helps dump one or more MySQL databases for backup or transfer to another SQL server.Features of mysqlpumpLet us understand the features of mysqlpump −Parallel processing of databases, as well as that of objects within databases, thereby helping speed up the dump process.It provides better control over which databases and database objects (tables, stored programs, user accounts) need to be dumpedDumping of user accounts as account-management statements (CREATE USER, GRANT) instead of ... Read More
The mysqlimport client comes with a command-line interface that helps with the LOAD DATA SQL statement. Most options to mysqlimport respond directly to clauses of LOAD DATA syntaxInvoking mysqlimportThe utility mysqlimport can be invoked as shown below −shell> mysqlimport [options] db_name textfile1 [textfile2 ...]For every text file that is named on the command line, mysqlimport strips any extension from the file name and uses the result to figure out the name of the table into which the file's contents have to be imported.ExampleLet us take an example: Files named sample.txt, sample.text, and sample all would be imported into a table ... Read More
The mysqldump client utility helps performs logical backups, thereby producing a set of SQL statements which can be executed to reproduce the original database object definitions and table data.mysqldump UsageIt dumps one or more MySQL databases for backup or transfer to another SQL server.The mysqldump command also generates output in CSV, other delimited text, or XML format.The utility mysqldump requires at least the SELECT privilege for dumped tables, SHOW VIEW for dumped views, TRIGGER for dumped triggers, LOCK TABLES if the --single-transaction option is not used, and PROCESS if --no-tablespaces option is not used.The databases can be cloned for the ... Read More
The mysqlcheck client performs table maintenance. It checks, repairs, optimizes, or analyses tables. If the user uses the --databases or --all-databases option to process all tables in one or more databases, invoking mysqlcheck would take a long time. This is true for the MySQL upgrade procedure as well, if it determines that the table checking is required since it processes tables in the same way.mysqlcheck UsageThe command mysqlcheck should be used when the mysqld server is running. This means that the user need not have to stop the server to perform table maintenance. It uses the SQL statements such as ... Read More
The ‘mysqladmin’ is a client that helps perform administrative operations. It can also be used to check the server's configuration and current status, to create and drop databases, and much more.The mysqladmin can be invoked by using the below command −shell> mysqladmin [options] command [command-arg] [command [command-arg]] ...Let us see some of the commands which mysqladmin supports. Some commands take an argument following the command name.create db_nameThis command creates a new database named db_name.drop db_nameIt deletes the database named db_name and all its tables.extended-statusIt displays the server status variables and their values.flush-hostsIt flushes all information in the host cache.flush-privilegesIt reloads ... Read More
Let us understand some of the client tips that are provided by MySQL −Input-Line EditingMysql supports input-line editing, which allows the user to modify the current input line in place or recall the previous input lines.Disabling Interactive HistoryThe up-arrow key allows the user to recall input lines from current and previous sessions. In case where a console is shared, this behaviour may not be suited. mysql supports disabling of the interactive history partially or fully, and this depends on the host platform.On Windows, the history is stored in memory. The keys ‘Alt+F7’ will delete all input lines stored in memory ... Read More
Let us understand how SQL statements can be executed from a text file on the MySQL client. The mysql client is generally used in interactive way. Let us see an example of the same −shell> mysql db_namePlace SQL Satements in a Text FileIt is also possible to put the SQL statements in a file and then tell mysql to read the input from that specific file. To do this, a text file text_file is first created.This text file would contain the statements that need to be executed. Let us take an example to understand the same −shell> mysql db_name < ... Read More
Let us understand the MySQL client-server side help −mysql> help search_stringIf an argument is provided to the above ‘help’ command, mysql will use it as a search string to access server-side help from the contents of the MySQL Reference Manual. The proper operation of this command needs that the help tables in the mysql database should be initialized with help topic information.If there is no match for the search string, then the search operation fails. Let us take an example to understand this −mysql> help meOutputNothing found Please try to run 'help contents' for a list of all accessible topicsWe ... Read More
Let us understand about client logging with respect to MySQL. The mysql client can do different types of logging for statements that are executed, and it can be interactively −UNIX - LoggingOn Unix, mysql writes the statements to a history file. By default, this file is named as .mysql_history in the user’s home directory. To specify a different file name, the value of the MYSQL_HISTFILE environment variable has to be set.If the --syslog option is given, mysql will write the statements to the system logging facility on all kinds of platforms. On Unix, this is known as syslog.Windows - LoggingOn ... Read More