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MySQLi Articles
Page 7 of 341
MySQL Client Server-Side Help
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 MoreMySQL Client Logging
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 MoreMySQL Client Commands
Let us understand some of the MySQL client commands −MySQL sends every SQL statement that the user issues to the server so that it can be executed. There is also a set of commands that mysql interprets on its own.Get the List of CommandsThe list of these commands can be found by typing the below mentioned command on the prompt −mysql> helpOutputList of all MySQL commands: Note that all text commands must be first on line and end with ';' ? (\?) Synonym for `help'. clear (\c) Clear the current input statement. connect (\r) Reconnect to the ...
Read MoreMySQL Client Options
The mysql supports the below mentioned options, which can be specified on the command line or in the [mysql] and [client] groups of an option file.--help, -?It helps display a help message and exit.--auto-rehashIt enables automatic rehashing. This option is set by default, which enables database, table, and column name completion.--auto-vertical-outputThis option causes the result sets to be displayed vertically if they are too wide for the current window, and it uses the normal tabular format otherwise.--batch, -BIt prints the results using tab as the column separator, with each row on a new line. With this option, mysql doesn’t use ...
Read MoreThe MySQL Command-Line Client
The mysql is a simple SQL shell that has input line editing capabilities. It supports interactive and noninteractive usage. When it is used interactively, query results are presented in an ASCII-table format. When it is used noninteractively, like a filter, the result would be presented in tab-separated format.The output format can be changed with the help of command options. If there are issues because of insufficient memory for large result sets, the --quick option can be used.This forces the mysql to retrieve results from the server, a row at a time instead of retrieving the entire result set at once ...
Read MoreMySQL Client Programs
There are 7 client programs, which are listed below −mysqlmysqladminmysqlcheckmysqldumpmysqlimportmysqlpumpmysqlshowmysqlslapLet us understand the MySQL client programs in brief −mysqlThe mysql is a simple SQL shell that has input line editing capabilities. It supports interactive and noninteractive usage. When it is used interactively, query results are presented in an ASCII-table format.It can be invoked from the prompt of the user’s command interpreter. It has been demonstrated below −shell> mysql db_namemysqladminThe 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.mysqlcheckThe mysqlcheck ...
Read Moremysql_upgrade - Check and Upgrade MySQL Tables
Let us understand mysql_upgrade program −UsageEvery time MySQL is upgraded, the user should execute mysql_upgrade, that looks for incompatibilities with the upgraded MySQL server.It upgrades the system tables in the mysql schema so that the user can take advantage of new privileges or capabilities that could have been added after the upgrade.It basically upgrades the Performance Schema and sys schema.It also examines user schemas.If mysql_upgrade finds that a table has a possible incompatibility, it performs a table check and, if some problems are found, attempts a table repair operationThe mysql_upgrade can be used as shown below −Ensure that the server ...
Read Moremysql_tzinfo_to_sql - Load the Time Zone Tables in MySQL
The mysql_tzinfo_to_sql program helps load the time zone tables in the mysql database. It is used on systems which have a zoneinfo database, i.e the set of files that describe the time zones. Examples of such systems include Linux, FreeBSD, Solaris, and macOS. One most probable location for these files is the /usr/share/zoneinfo directory (/usr/share/lib/zoneinfo on Solaris).Invoking mysql_tzinfo_to_sqlIf the system doesn’t have a zoneinfo database, the downloadable package can be installed. The mysql_tzinfo_to_sql can be invoked in many ways. Some of them have been shown below −shell> mysql_tzinfo_to_sql tz_dir (or) shell> mysql_tzinfo_to_sql tz_file tz_name (or) shell> mysql_tzinfo_to_sql --leap tz_fileIn the ...
Read Moremysql_ssl_rsa_setup - Create SSL/RSA Files in MySQL
Let us understand mysql_ssl_rsa_setup program −This program helps create the SSL certificate, key files and the RSA key-pair files that are required to support secure connections with the help of SSL and secure password exchange using RSA over unencrypted connections, if they are missing. The mysql_ssl_rsa_setup program can be used to create new SSL files if the existing ones have expired.Invoking mysql_ssl_rsa_setupThe mysql_ssl_rsa_setup can be invoked as shown below −shell> mysql_ssl_rsa_setup [options]Some of the options include --datadir which is used to specify where to create the files, and the --verbose option to see the ‘openssl’ commands that mysql_ssl_rsa_setup executes.The ‘mysql_ssl_rsa_setup’ ...
Read Moremysql_secure_installation - Improve MySQL Installation Security
What is mysql_secure_installation?Let us understand the MySQL installation related program mysql_secure_installation −This program enables the user to improve the security of their MySQL installation in the below mentioned ways:The user can set a password for root accounts.The user can remove root accounts which are accessible from outside the local host.The user can remove anonymous-user accounts.The user can remove the test database which, by default, can be accessed by all users, even anonymous users), and privileges that permit anyone to access databases with names that start with test_.The mysql_secure_installation helps the user to implement security recommendations.Normal usage is to connect to ...
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