SQL*Plus Command Reference Last Updated : 06 Jun, 2024 Comments Improve Suggest changes Like Article Like Report SQL*Plus is a command-line tool for Oracle Database that allows users to interact with the database using SQL and PL/SQL commands. Here, we will discuss the SQL*Plus commands, and understand how to use the SQL*Plus command-line argument. SQL*Plus CommandsHere is a list of some essential SQLPlus Commands: CommandSyntaxDescriptionCONNECTCONNECT username/password@hostname:port/service_name;Connects to a database using the specified credentials and connection details.SELECTSELECT * FROM tablename;Executes an SQL query to retrieve data from a table.DESCRIBEDESCRIBE tablename;Displays the structure of a table (columns, data types, etc.).SET LINESIZESET LINESIZE n;Sets the maximum line width for query output.SET PAGESIZESET PAGESIZE n;Sets the number of lines per page for query output.SPOOLSPOOL filename;Redirects query output to a file.STARTSTART script.sql;Executes a script file.EDITEDIT;Opens the default text editor to edit the current command buffer.HOSTHOST command;Executes an operating system command.QUIT or EXITQUIT; or EXIT;Disconnects from the database and exits SQL*Plus.VARIABLEVARIABLE my_var NUMBER;Defines and uses variables in SQL*Plus.COLUMNCOLUMN column_name FORMAT A20;Formats query output for a specific column.SET ECHOSET ECHO OFF;Suppresses command echoing.SET TIMINGSET TIMING ON;Displays execution time for SQL statements.Command Line Arguments in SQL*PlusCommand line arguments in SQLPlus are the parameters that control the behavior of the tool. These arguments can include script names, connection details, and other options. Command-line arguments are used to streamline workflows and automate tasks. SyntaxSQLPlus command-line argument syntax is: sqlplus [username]/[password]@[database] @script.sql Here, sqlplus: Command to start SQL*Plus.[username]/[password]@[database]: Connection details to log in to the Oracle Database.@script.sql: The SQL script file to be executed.Maximum Length of Command Line ArgumentThe maximum length of a command line argument is determined by the operating system. In Linux, the maximum length is typically 131,072 bytes (or 128 KB). This includes the length of the SQL*Plus command, SQL query, and any additional parameters. SQL*Plus Command Line Argument LimitsItem Limit filename length system dependent username length 128 bytes substitution variable name length 128 bytes substitution variable value length 240 bytes command-line length 5000 characters LONG 2,000,000,000 bytes LINESIZE system dependent LONGCHUNKSIZE value system dependent output line size system dependent SQL or PL/SQL command- line size after variable substitution 3,000 characters (internal only) number of characters in a COMPUTE command label 500 characters number of lines per SQL command 500 (assuming 80 characters per line) maximum PAGESIZE 50,000 lines total row width 32,767 characters maximum ARRAYSIZE 5000 rows maximum number of nested scripts 20 maximum page number 99,999 maximum PL/SQL error message size 2K maximum ACCEPT character string length 240 bytes maximum number of substitution variables 2048 SQL*Plus ExampleExceeding Maximum Length LimitImagine you have a more complex SQL script file named long_script.sql with a large query: long_script.sql File SELECT * FROM employees WHERE salary > 50000 AND department_id IN (SELECT department_id FROM departments WHERE location_id = 'XYZ') AND hire_date < TO_DATE('2022-01-01', 'YYYY-MM-DD') AND ... (continued)And you attempt to run the following SQL*Plus command: sqlplus system/manager@orcl @long_script.sqlIn this case, the total length of the SQL*Plus command, along with the connection details, and the lengthy SQL script, might exceed the maximum limit imposed by the operating system. If the length surpasses the limit, you could encounter an error similar to: bash: /bin/sqlplus: Argument list too longThis error indicates that the total length of the command line argument has exceeded the maximum allowed, and the command cannot be executed. To avoid this issue, it's recommended to store complex and lengthy SQL commands or queries in separate script files and execute them using SQL*Plus. ConclusionSQL*Plus is a command-line tool provided by Oracle for interacting with Oracle Database. It allows you to perform various tasks related to querying, data manipulation, and database administration. SQL*Plus commands are case-insensitive, and can be abbreviated (e.g., DESCRIBE as DESC). 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