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How To Tell If a Session Is New
How To Tell If a Session Is New? - PHP Script Tips - Understanding and Using Sessions There is not direct way to tell if a session is new or old. But you can design your site to have a required session value in all sessions. Then you can check the existence of this value in a session to determine if... 2007-04-17, 5673👍, 0💬

What Are the Restrictions in a READ ONLY Transaction
What Are the Restrictions in a READ ONLY Transaction? - Oracle DBA FAQ - Understanding SQL Transaction Management There are lots of restrictions in a READ ONLY transaction: You can not switch to READ WRITE mode. You can not run any INSERT, UPDATE, DELETE statements. You can run SELECT query statemen... 2007-04-17, 5431👍, 0💬

What Are the General Rules on Data Consistency
What Are the General Rules on Data Consistency? - Oracle DBA FAQ - Understanding SQL Transaction Management All SQL statements always work with a snapshot of the database to provide data consistency. For READ WRITE transactions, the snapshot is taken when each statement starts. For READ ONLY transac... 2007-04-17, 5455👍, 0💬

How To Remove Values Saved in the Current Session
How To Remove Values Saved in the Current Session? - PHP Script Tips - Understanding and Using Sessions If you want to remove values saved in the current session, you should use the unset() function on those saved values in $_SESSION, or use array() to empty $_SESSION: unset($_SESSION['MyColor']) - ... 2007-04-17, 5429👍, 0💬

How To Close a Session Properly
How To Close a Session Properly? - PHP Script Tips - Understanding and Using Sessions Let's say you site requires users to login. When a logged in user clicks the logout button, you need to close the session associated with this user properly in 3 steps: Remove all session values with $_SESSION = ar... 2007-04-17, 5296👍, 0💬

What Are Transaction Isolation Levels Supported by Oracle
What Are Transaction Isolation Levels Supported by Oracle? - Oracle DBA FAQ - Understanding SQL Transaction Management Oracle supports two transaction isolation levels: READ COMMITTED (the default option). If the transaction contains DML that requires row locks held by another transaction, then the ... 2007-04-17, 6488👍, 0💬

What Is a Data Lock
What Is a Data Lock? - Oracle DBA FAQ - Understanding SQL Transaction Management A data lock is logical flag the Oracle server is placed on data objects to give an exclusive right to a transaction. Statements in other transactions needs to respect data locks based on certain rules. Rules on data loc... 2007-04-17, 5278👍, 0💬

Is It More Secure to Use Cookies to Transfer Session IDs
Is It More Secure to Use Cookies to Transfer Session IDs? - PHP Script Tips - Understanding and Using Sessions Is it more secure to use cookies to transfer session IDs? The answer is yes, because attacking your Web site using URL parameters is much easier than using cookies. So if you are the system... 2007-04-17, 4998👍, 0💬

How To Experiment a Data Lock
How To Experiment a Data Lock? - Oracle DBA FAQ - Understanding SQL Transaction Management If you want to have some experience with data locks, you can create two windows runing two SQL*Plus sessions. In session 1, you can run a UPDATE statements to create a data lock. Before committing session 2, s... 2007-04-17, 5163👍, 0💬

How Data Locks Are Respected
How Data Locks Are Respected? - Oracle DBA FAQ - Understanding SQL Transaction Management Here are the rules on how data locks are respected: All statements ignore data locks owned its own transaction. SELECT query statements ignores data locks owned by any transactions. INSERT, UPDATE, and DELETE s... 2007-04-17, 5276👍, 0💬

How To View Existing Locks on the Database
How To View Existing Locks on the Database? - Oracle DBA FAQ - Understanding SQL Transaction Management As can see from the pervious tutorial exercise, performance of the second session is greatly affected by the data lock created on the database. To maintain a good performance level for all session... 2007-04-17, 6739👍, 0💬

How To Create Tables for ODBC Connection Testing
How To Create Tables for ODBC Connection Testing? - Oracle DBA FAQ - ODBC Drivers, DSN Configuration and ASP Connection 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/ret... 2007-04-17, 5618👍, 0💬

How To Find Out What Oracle ODBC Drivers Are Installed
How To Find Out What Oracle ODBC Drivers Are Installed? - Oracle DBA FAQ - ODBC Drivers, DSN Configuration and ASP Connection 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 ... 2007-04-17, 5692👍, 0💬

How To Define a Data Source Name (DSN) in ODBC Manager
How To Define a Data Source Name (DSN) in ODBC Manager? - Oracle DBA FAQ - ODBC Drivers, DSN Configuration and ASP Connection DSN (Data Source Name) is an ODBC connection identifier for Windows applications. Here is how you can define a DSN on your Windows system: Go to Control Panel. Go to Administ... 2007-04-17, 8753👍, 0💬

How To Connect MS Access to Oracle Servers
How To Connect MS Access to Oracle Servers? - Oracle DBA FAQ - ODBC Drivers, DSN Configuration and ASP Connection Once you got a DSN defined in the ODBC manager that connects to an Oracle server, you can connect a normal MS Access document to the Oracle server, and link an Access table to Oracle tab... 2007-04-17, 5872👍, 0💬

How To Connect ASP Pages to Oracle Servers
How To Connect ASP Pages to Oracle Servers? - Oracle DBA FAQ - ODBC Drivers, DSN Configuration and ASP Connection 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 co... 2007-04-17, 5635👍, 0💬

What Is Open Database Communication (ODBC)
What Is Open Database Communication (ODBC)? - Oracle DBA FAQ - ODBC Drivers, DSN Configuration and ASP Connection ODBC, Open Database Communication, a standard API (application program interface) developed by Microsoft for Windows applications to communicate with database management systems. Oracle ... 2007-04-17, 5754👍, 0💬

How To Check the Oracle TNS Settings
How To Check the Oracle TNS Settings? - Oracle DBA FAQ - ODBC Drivers, DSN Configuration and ASP Connection If you have installed an Oracle server or an Oracle client tool on your local system, the TNS is automatically installed with a simple configuration file, tnsnames.ora, to define Oracle connec... 2007-04-17, 8857👍, 0💬

How To Install Oracle ODBC Drivers
How To Install Oracle ODBC Drivers? - Oracle DBA FAQ - ODBC Drivers, DSN Configuration and ASP Connection Oracle offers different ODBC drivers for different versions of Oracle servers. When you install an Oracle server or a client tools on your Windows system, the appropriate ODBC driver will be ins... 2007-04-17, 5712👍, 0💬

How Oracle Handles Dead Locks
How Oracle Handles Dead Locks? - Oracle DBA FAQ - Understanding SQL Transaction Management Oracle server automatically detects dead locks. When a dead lock is detected, Oracle server will select a victim transaction, and fail its statement that is blocked in the dead lock to break the dead lock. The... 2007-04-17, 7468👍, 0💬

What Is a Dead Lock
What Is a Dead Lock? - Oracle DBA FAQ - Understanding SQL Transaction Management A dead lock is phenomenon happens between two transactions with each of them holding a lock that blocks the other transaction as shown in the following diagram: (transaction 1) (transaction 2) update row X to create loc... 2007-04-17, 5499👍, 0💬

How Can Windows Applications Connect to Oracle Servers
How Can Windows Applications Connect to Oracle Servers? - Oracle DBA FAQ - ODBC Drivers, DSN Configuration and ASP Connection A Windows application can connect to an Oracle server directly, if it knows how to use the Oracle TNS technology. A Windows application can connect to an Oracle server indire... 2007-04-17, 5647👍, 0💬

What Is an Oracle Tablespace
What Is an Oracle Tablespace? - Oracle DBA FAQ - Oracle Basic Concepts An Oracle tablespace is a big unit of logical storage in an Oracle database. It is managed and used by the Oracle server to store structures data objects, like tables and indexes. Each tablespace in an Oracle database consists of... 2007-04-16, 5015👍, 0💬

Examples of INSERT INTO Statements
Examples of INSERT INTO Statements INSERT INTO table_name VALUES (value1, value2,....) INSERT INTO table_name (column1, column2,...) VALUES (value1, value2,....) 2007-04-15, 5128👍, 0💬

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.NET C C++ CSS DBA General HTML Java JavaScript JSP JUnit MySQL Networking Oracle Perl Perl PHP PL/SQL RSS Software QA SQL Server Struts Unix Windows XHTML XML