General MySQL Oracle SQL Server

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Main Features of SQL*Plus in Oracle
What Is SQL*Plus in Oracle? SQL*Plus is an interactive and batch query tool that is installed with every Oracle Database Server or Client installation. It has a command-line user interface, a Windows Graphical User Interface (GUI) and the iSQL*Plus web-based user interface. SQL*Plus has its own comm... 2020-08-25, 3446🔥, 0💬

Help at the SQL Prompt in Oracle
How To Get Help at the SQL Prompt in Oracle? Once SQL*Plus is started, you will get a SQL prompt like this: SQL&gt;. This where you can enter commands for SQL*Plus to run. To get help information at the SQL prompt, you can use the HELP command as shown in the following tutorial example: SQL&... 2020-08-25, 2987🔥, 0💬

Error: Could not Resolve the Connect Identifier in Oracle
What Happens If You Use a Wrong Connect Identifier in Oracle? Of course, you will get an error, if you use a wrong connect identifier. Here is an example of how SQL*Plus react to a wrong connect identifier: SQL&gt; CONNECT fyi/retneciyf@WRONG; ERROR: ORA-12154: TNS:could not resolve the connect ... 2020-08-13, 3464🔥, 0💬

Connect SQL*Plus Session to Oracle Server in Oracle
How To Connect a SQL*Plus Session to an Oracle Server in Oracle? In order to connect a SQL*Plus session to an Oracle server, you need to: 1. Obtain the connection information from the Oracle server DBA. 2. Define a new "connect identifier" called "FYI_XE" in your tnsnames.org file with the given con... 2020-08-13, 3448🔥, 0💬

Types of Commands Executed in SQL*Plus in Oracle
What Types of Commands Can Be Executed in SQL*Plus in Oracle? There are 4 types of commands you can run at the SQL*Plus command line prompt: 1. SQL commands - Standard SQL statements to be executed on target database on the Oracle server. For example: "SELECT * FROM fyi_faq;" is a SQL command. 2. PL... 2020-08-13, 3372🔥, 0💬

What Is a Connect Identifier in Oracle
What Is a Connect Identifier in Oracle? A "connect identifier" is an identification string of a single set of connection information to a specific target database instance on a specific Oracle server. Connect identifiers are defined and stored in a file called tnsnames.ora located in $ORACLE_HOME/ne... 2020-08-13, 3207🔥, 0💬

Reset Lost SYSTEM Password in Oracle
What To Do If DBA Lost the SYSTEM Password in Oracle? If the DBA lost the password of the SYSTEM user account, he/she can go to the Oracle server machine, and run SQL*Plus on server locally with the operating system authentication method to gain access to the database. The tutorial exercise below sh... 2020-08-13, 2715🔥, 0💬

Run SQL Commands in SQL*Plus in Oracle
How To Run SQL Commands in SQL*Plus in Oracle? If you want to run a SQL command in SQL*Plus, you need to enter the SQL command in one or more lines and terminated with (;). The tutorial exercise below shows a good example: SQL&gt; SELECT 'Welcome!' FROM DUAL; 'WELCOME -------- Welcome! SQL&g... 2020-08-03, 3928🔥, 1💬

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Show Current SQL*Plus System Settings in Oracle
How To Look at the Current SQL*Plus System Settings in Oracle? If you want to see the current values of SQL*Plus system settings, you can use the SHOW command as shown in the following tutorial exercise: SQL&gt; SHOW AUTOCOMMIT autocommit OFF SQL&gt; SHOW HEADING heading ON SQL&gt; SHOW ... 2020-07-22, 12181🔥, 0💬

SQL*Plus Environment Variables in Oracle
What Are SQL*Plus Environment Variables in Oracle? Behaviors of SQL*Plus are also controlled a some environment variables predefined on the local operating system. Here are some commonly used SQL*Plus environment variables: ORACLE_HOME - The home directory where your Oracle client application is ins... 2020-07-22, 3351🔥, 0💬

Change SQL*Plus System Settings in Oracle
How To Change SQL*Plus System Settings in Oracle? SQL*Plus environment is controlled a big list of SQL*Plus system settings. You can change them by using the SET command as shown in the following list: SET AUTOCOMMIT OFF - Turns off the auto-commit feature. SET FEEDBACK OFF - Stops displaying the "2... 2020-07-22, 3340🔥, 0💬

Run PL/SQL Statements in SQL*Plus in Oracle
How To Run PL/SQL Statements in SQL*Plus in Oracle? If you want to run a single PL/SQL statement in SQL*Plus, you need to use the EXECUTE command as shown in the following tutorial example: SQL&gt; SET SERVEROUTPUT ON SQL&gt; EXECUTE DBMS_OUTPUT.PUT_LINE('Welcome to FYIcenter!') Welcome to F... 2020-07-22, 3216🔥, 0💬

Revise and Rerun the Last SQL Command in Oracle
How To Revise and Re-Run the Last SQL Command in Oracle? If executed a long SQL statement, found a mistake in the statement, and you don't want enter that long statement again, you can use the input buffer commands to the correct last statement and re-run it. The following tutorial exercise gives yo... 2020-07-15, 6964🔥, 0💬

Input Buffer in SQL*Plus in Oracle
What Is Input Buffer in SQL*Plus in Oracle? Input buffer is a nice feature of the command-line SQL*Plus tool. It allows you to revise a multiple-line command and re-run it with a couple of simple commands. By default, input buffer is always turned on in SQL*Plus. The last SQL statement is always sto... 2020-07-15, 3922🔥, 0💬

Save Query Output to a Local File in Oracle
How To Save Query Output to a Local File in Oracle? Normally, when you run a SELECT statement in SQL*Plus, the output will be displayed on your screen. If you want the output to be saved to local file, you can use the "SPOOL fileName" command to specify a local file and start the spooling feature. W... 2020-07-15, 3666🔥, 0💬

Generate Query Output in HTML Format in Oracle
How To Generate Query Output in HTML Format in Oracle? If you want your query output to be generated in HTML format, you can use the "SET MARKUP HTML ON" to turn on the HTML feature. The following tutorial exercise gives you a good example: SQL&gt; connect HR/retneciyf SQL&gt; SET MARKUP HTM... 2020-07-15, 3642🔥, 0💬

Output Spooling in SQL*Plus in Oracle
What Is Output Spooling in SQL*Plus in Oracle? The output spooling a nice feature of the command-line SQL*Plus tool. If the spooling feature is turned on, SQL*Plus will send a carbon copy of the everything on your screen to a specified local file. Output spooling is used mostly for quick dump of dat... 2020-07-15, 3453🔥, 0💬

What Is Program Global Area (PGA) in Oracle
What Is Program Global Area (PGA) in Oracle? A Program Global Area (PGA) is a memory buffer that is allocated for each individual database session and it contains session specific information such as SQL statement data or buffers used for sorting. The value specifies the total memory allocated by al... 2020-07-07, 4651🔥, 0💬

What Is System Global Area in Oracle
What Is System Global Area (SGA) in Oracle? The System Global Area (SGA) is a memory area that contains data shared between all database users such as buffer cache and a shared pool of SQL statements. The SGA is allocated in memory when an Oracle database instance is started, and any change in the v... 2020-07-07, 3180🔥, 0💬

What Is a Server Parameter File in Oracle
What Is a Server Parameter File in Oracle? A server parameter file is a binary file that acts as a repository for initialization parameters. The server parameter file can reside on the machine where the Oracle database server executes. Initialization parameters stored in a server parameter file are ... 2020-07-07, 3111🔥, 0💬

What Is an Initialization Parameter File in Oracle
What Is an Initialization Parameter File in Oracle? An initialization parameter file is a text file that contains a list of initialization parameters. The file should be written in the client's default character set. Sample initialization parameter files are provided on the Oracle distribution mediu... 2020-07-07, 3013🔥, 0💬

What Is a User Account in Oracle
What Is a User Account in Oracle? A user account is identified by a user name and defines the user's attributes, including the following: Password for database authentication Privileges and roles Default tablespace for database objects Default temporary tablespace for query processing work space   ⇒... 2020-07-07, 2527🔥, 0💬

Use SQL*Plus Built-in Timer in Oracle
How To Use SQL*Plus Built-in Timers in Oracle? If you don't have a stopwatch/timer and want to measure elapsed periods of time, you can SQL*Plus Built-in Timers with the following commands: TIMING - Displays number of timers. TIMING START [name] - Starts a new timer with or without a name. TIMING SH... 2020-06-08, 4266🔥, 0💬

SQL*Plus Commands Stored in a File in Oracle
How Run SQL*Plus Commands That Are Stored in a Local File in Oracle? If you have a group of commands that you need to run them repeatedly every day, you can save those commands in a file (called SQL script file), and using the "@fileName" command to run them in SQL*Plus. If you want to try this, cre... 2020-06-08, 3381🔥, 0💬

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General MySQL Oracle SQL Server