MySQL preguntas y respuestas de entrevista
Pregunta 46. How To Analyze Tables with "mysqlcheck"?
If you want analyze tables with "mysqlcheck", you need to use the "--analyze" option. The following tutorial exercise shows you how to analyze all tables in "mysql" database:
>cd mysqlbin
>mysqlcheck -u root --analyze mysql
mysql.columns_priv Table is already up to date
mysql.db Table is already up to date
mysql.func Table is already up to date
mysql.help_category Table is already up to date
mysql.help_keyword Table is already up to date
mysql.help_relation Table is already up to date
mysql.help_topic Table is already up to date
mysql.host Table is already up to date
mysql.proc Table is already up to date
mysql.tables_priv Table is already up to date
mysql.time_zone Table is already up to date
mysql.time_zone_leap_second Table is already up to date
mysql.time_zone_name Table is already up to date
mysql.time_zone_transition Table is already up to date
mysql.time_zone_transition_type Table is already up to date
mysql.user Table is already up to date
Pregunta 47. What Is "mysqlshow"?
"mysqlshow" is a command-line interface for end users to see information on tables and columns. Here are some sample commands supported by "mysqlshow":
► "mysqlshow" - Shows all the databases.
► "mysqlshow databaseName" - Shows all the tables in the specified database.
► "mysqlshow databaseName tableName" - Shows all the columns in the specified table.
► "mysqlshow --verbose" - Shows all the databases with extra information.
► "mysqlshow --verbose my%" - Shows all the databases who's names match the pattern "my%" with extra information.
► "mysqlshow --verbose mysql time%" - Shows all the tables who's names match the pattern "time%" in "mysql" database with extra information.
Pregunta 48. What Is "mysqldump"?
"mysqldump" - A command-line interface for administrators or end users to export data from the server to files. Here are some sample commands supported by "mysqldump":
► "mysqldump databaseName tableName" - Dumps the specified table in the specified database.
► "mysqldump databaseName" - Dumps all the tables in the specified database.
Pregunta 49. How To Dump a Table to a File with "mysqldump"?
If you want to dump all rows in a table from the server to a file, you can use "mysqldump" with the "-f fileName" option as show in the following tutorial exercise:
>cd mysqlbin
>mysqldump -u root -r templinks.txt test links
>type templinks.txt
>type templinks.txt | more
-- MySQL dump 10.10
--
-- Host: localhost Database: test
-- ------------------------------------------------------
-- Server version 5.0.24-community
...
The dump file contains SQL statements that you can use to restore the table and its data content.
Pregunta 50. What Is "mysqlimport"?
"mysqlimport" - A command-line interface for administrators or end users to load data files into tables program tool to load data into tables. Here is a sample commands supported by "mysqlimport":
► "mysqlimport databaseName fileName" - Imports the data from the specified file to the specified database. The data will be loaded into the table who's name matches the specified file name.
Lo mas util segun los usuarios: