Oracle Database Tutorials
Where to find Oracle database server tutorials? Here is a collection of tutorials, tips and FAQs for Oracle DBAs and Oracle database application developers. Clear explanations and simple examples provided can be used as learning tutorials or interview preparation guides. It doesn't matter whether yo... 2017-07-10, 1730👍, 2💬
Connect ASP Pages to Oracle Servers in Oracle
How To Connect ASP Pages to Oracle Servers in Oracle? If you are running Windows IIS Web server and serving ASP Web pages, you can get data from Oracle servers into your ASP pages through ODBC drivers. To do this, you need to install the correct Oracle ODBC driver and define a DSN on the IIS Web ser... 2016-10-15, 191👍, 0💬
Create Tables for ODBC Connection Testing in Oracle
How To Create Tables for ODBC Connection Testing in Oracle? If you want to follow the tutorial exercises in the sections below, you need to create a user account and a table for ODBC connection testing as shown here: SQL> CONNECT system/retneciyf Connected. SQL> CREATE USER fyi IDENTIFIED BY r... 2016-10-15, 190👍, 0💬
Transaction Isolation Levels in MySQL
What Are Transaction Isolation Levels in MySQL? There are 4 transaction isolation levels defined by SQL-1992 standard: READ UNCOMMITTED - The SELECT statements in one transaction will read uncommitted data changes from transactions of all connected sessions. In this level, "dirty read" could happen,... 2017-08-03, 189👍, 0💬
Starting mysqld to Support BDB Storage Engine in MySQL
How To Start mysqld to Support the BDB Storage Engine in MySQL? The default "mysqld" program does not support the BDB storage engine. If you want to use the BDB storage engine, you can start MySQL server with the "mysqld-max" program. The tutorial exercise below shows you how to start "mysqld-max" a... 2017-08-13, 188👍, 0💬
What Are Triggers in SQL Server
What Are Triggers in SQL Server? A trigger is a special kind of stored procedure that automatically executes when an event occurs in the database server. A trigger is really an event handler. SQL Server allows users to create triggers (event handlers) for 3 types of events: DML Event - Occurs when a... 2016-10-25, 188👍, 0💬
Show Installed Oracle ODBC Drivers in Oracle
How To Find Out What Oracle ODBC Drivers Are Installed in Oracle? To find out what Oracle ODBC drivers are installed on your Windows system, you can use the ODBC manager to look at them: Go to Control Panel. Go to Administrative Tools. Run Data Sources (ODBC). Go to System DSN tab. Click the Add but... 2016-10-15, 187👍, 0💬
Selecting Some Specific Rows from a Table in SQL Server
How To Select Some Specific Rows from a Table in SQL Server? If you don't want select all rows from a table, you can specify a WHERE clause to tell the query to return only the rows that meets the condition defined in the WHERE clause. The WHERE clause condition is a normal Boolean expression. If an... 2016-10-26, 186👍, 0💬
Data File of BDB Storage Engine in MySQL
Where Table Data Is Stored by the BDB Storage Engine in MySQL? By default, MySQL provides \mysql\data directory for all storage engines to store table data. Under \mysql\data directory, the BDB storage engine will create one file for each table to store table data and index data. If a new table is c... 2017-08-13, 183👍, 0💬
"FETCH" - Transferring Data from Cursors to Variables in SQL Server
How To Transfer Data from a Cursor to Variables with a "FETCH" Statement in SQL Server Transact-SQL? By default, a FETCH statement will display the fetched row on the client program window. If you want to transfer the output data to variables, you can specify an INTO clause with a list of variables ... 2016-10-17, 183👍, 0💬
Data File for InnoDB Storage Engine in MySQL
Where Table Data Is Stored by the InnoDB Storage Engine in MySQL? By default, MySQL provides \mysql\data directory for all storage engines to store table data. Under \mysql\data directory, InnoDB storage engine will create 3 files to store and manage all tables that use the InnoDB storage engine: ib... 2017-08-13, 182👍, 0💬
Tables Using MEMORY Storage Engine in MySQL
How To Create a New Table Using the MEMORY Storage Engine in MySQL? MEMORY storage engine stores table data in computer system memory. This is good for creating temporary tables. MEMORY is not the default storage engine. You need to specify "ENGINE = MEMORY" at the end of the "CREATE TABLE" statemen... 2017-08-08, 182👍, 0💬
Data Removed in MEMORY Tables in MySQL
What Happens to MEMORY Tables When MySQL Server Is Stopped in MySQL? If you have data rows stored in a table with the MEMORY storage engine, and the MySQL server has been shut down by the DBA, all data rows will be removed. But the table structure will remain in the server. The tutorial exercise bel... 2017-08-08, 179👍, 0💬
Change Transaction Isolation Level in MySQL
How To View and Change the Current Transaction Isolation Level in MySQL? If you want to view or change the current transaction isolation level, you can use the following commands: SELECT @@TX_ISOLATION FROM DUAL; -- Viewing the current transaction isolation level. SET TRANSACTION ISOLATION LEVEL lev... 2017-08-08, 179👍, 0💬
Tables Using CSV Storage Engine in MySQL
How To Create a New Table Using the CSV Storage Engine in MySQL? CSV (Comma-Separated Values) storage engine stores table data in text files in comma-separated value format. CSV is not the default storage engine. You need to specify "ENGINE = CSV" at the end of the "CREATE TABLE" statement to create... 2017-08-13, 171👍, 0💬
How To Select Some Specific Columns from a Table in a Query in SQL Server? If you want explicitly te...
How to run Queries with SQL Server Management Studio Express in SQL Server? 1. Launch and connect SQ...
How Fixed Length Strings Are Truncated and Padded in SQL Server Transact-SQL? When the length of the...
How To Create a View on an Existing Table in SQL Server? If you want to a view on an existing table,...
What Happens If the Imported Table Already Exists in Oracle? If the import process tries to import a...