tech sectiontech sectionOracle is one of the world's most popular relational databases, used by small to enterprise businesses across the globe, states "Marketshare: All Software Markets, Worldwide 2011." These databases can store customer information, sales information, marketing figures and financial transactions, among others. Oracle database software is powerful and flexible, but also requires maintenance and upkeep by the database administrator. If Oracle hangs while creating a database, don't panic. There are several solutions that you can try.
Connections to an Oracle database use up network bandwidth and system memory, so databases handling many connections will limit the speed and responsiveness of the system for all users. Servers with significant bandwidth may handle thousands of incoming connections while systems using database resident connection pooling may handle tens of thousands of connections before performance degrades. A few users running many database connections or consuming disproportionate resources may prevent others from accessing the database, regardless of their number.
Oracle listeners receive and process access requests and queries from one or more Oracle databases. A properly configured Oracle 9i database can run with an Oracle 10g listener, which may prove necessary after you restore a database built on an older version of Oracle from archive but the server runs on Oracle 10g. You may also find yourself in this situation when an Oracle 9i and 10g database must share a single Oracle 10g listener.
An "ORA-12637 packet receive failed" error indicates that communication failures exist with an Oracle database and its supporting processes. The Oracle Database software serves as a database management system, and generates such message when it cannot access a database or failed to receive an expected response within a predetermined period.
Databases power the top businesses and websites in the world today, allowing for the efficient querying of large amounts of data. Structured Query Language is used to retrieve information from databases. Spatial information, such as coordinates are commonly stored in databases. You can find the entry in a database that is closest to a specific position using SQL with a few lines of code.
Connecting to MySQL with Javascript requires you to keep a few very important things in mind. Get a tutorial for connecting to MySQL with Javascript with help from a self-taught web developer in this free video clip.
WebLogic transaction processing software expedites data source, database and client machine connectivity, enabling you to quickly locate and connect to stored data source connections. Manage and keep track of WebLogic data sources by using the Java Naming and Directory Interface -- JNDI -- to identify each data source by name and store information about their connections in the JNDI tree.
A static PHP page displays the same image for every featured image on your website. You can use dynamic content stored in a database to display an image you associate with a particular article. This means you can dynamically display images for each article without keeping the same image on the site for every Web page you create for your reader's content.
Almost all ColdFusion applications use at least one database, so understanding how to link one to your application is vital. ColdFusion uses the term "data source" to define a database it has access to. Furthermore, ColdFusion will work with any database developed on any database platform, so you can build the database any way you want. However, you must set up the database in ColdFusion before it can connect to it. You do this by defining and configuring a new data source, using the ColdFusion Administration page.
Yahoo! group owners, moderators and members often create tables of data for group members to review. A table is a list of information important to the group presented in a traditional table format with two or more columns and multiple rows. Typically, any problems you might have with a Yahoo! group database table result from not understanding the basic table tools or table limitations.
Database tables have unique identification numbers, called primary keys, for each individual row. MySQL's auto-increment function automatically assigns a new number to an integer column you specify as your primary key, which saves you the time needed to create your own primary key and tracking code. If you drop rows, however, your sequence of auto-increment values falls out of sync with the rest of the column values.
The mySQL open-source database management software uses the industry-standard Structured Query Language for data transactions and database maintenance. As with other SQL dialects, mySQL offers a set of aggregate functions that perform statistical math on groups of data. You can mix these functions with standard math in your programs, but only under certain conditions.
MySQL syntax errors from commas boil down to one of two issues: either MySQL does not see a comma where it should or it sees a comma somewhere it should not. Because MySQL syntax errors and not very precise it is up to you to figure out if you made a simple typo, used a name that MySQL reserves for its own use or enclosed syntax components you should not have in apostrophes or quotation marks.
The ColdFusion Markup Language, or simply ColdFusion, is a scripting language that makes it simple for you to design HTML pages and connect them to online databases, such as in Oracle. To make the connection and use the data from the database on your site, use the built-in functions designed for each task.
Database applications such as MySQL are the electronic equivalent of clerk that knows how to quickly find the file you need when given only the date or subject matter. The PHP language makes MySQL even more efficient by providing capabilities such as the "explode" function, which allows you to format data in a form that can be efficiently stored to your database and subsequently retrieved.
The MySQL database manager uses the Structured Query Language for administration, reporting and updating data. Beginning with version 4.0 of the software, MySQL has supported transactions, or groups of SQL statements that the database treats as indivisible units. Because a database consists of many tables, changes to multiple tables complicate matters when problems arise. A half-completed set of SQL statements can result in a database with faulty data. By handling multiple statements as a single transaction, MySQL improves database integrity. The transaction capability includes the SQL statements BEGIN, COMMIT and ROLLBACK, which serve to start and end transactions and perform…
When you create a new table in a MySQL database, you may want to insert some sample records, either to test to ensure the constraints are working properly or simply to have some information to select. To insert new information into a MySQL table, you use the INSERT statement. Each INSERT adds a new record, or row, to the table. When inserting, you may specify the fields to which you want to add data, which is useful if you don't know everything about a record.
Even small organizations that use the Oracle database manager typically have multiple databases on their server; medium-to-large companies have many databases distributed among several servers. As you work in one database, you can access another. Oracle does this with database objects called links. When you create a link, you have two options for authenticating the user: implicitly with the “current_user” keyword, or explicitly by specifying a username and password. When you choose current_user, Oracle passes the user’s existing credentials to the other database; if he has none, specify a username and password valid for the database.
Programmers don't expect the code they write to initially malfunction -- but it usually does. Debugging, the process of tracking down and resolving these errors, takes on additional dimensions when software involves database tables. The term "debugging query" could refer to several different aspects of resolving issues related to storing values in and retrieving values from databases.
The developers of the MySQL database have continually improved its functionality to meet the needs of Web applications such as blogs and social networking sites. You can tweak its performance even more by changing the settings of MySQL's query cache, which can increase database speed by storing the results of a query in the server's memory. When the same query is sent again, data is retrieved from server RAM rather than slower, database server hardware.
Business software developers use upgrades to provide fixes to the technology they've manufactured. Depending on the size of the software suite, upgrades can be very large and complex to apply properly, making installation the job of a software administrator or an entire IT staff. Siebel QF upgrades must be downloaded and then packaged for application to a range of CRM, or customer relationship management, applications.
XAMPP installations include an application called "phpMyAdmin" that you can use to configure your MySQL databases. PhpMyAdmin is accessed through any Web browser on your computer and offers an interface that you can use to create, edit and delete MySQL databases. The ability to make changes to your MySQL databases in this fashion simplifies the process of using them in your websites and Web applications. The phpMyAdmin application can even allow you to use your databases with very little knowledge of MySQL.
SQLite databases are often used as temporary databases for smaller applications and testing purposes. MySQL databases are often used on large-scale platforms. You can convert SQLite databases for use in MySQL databases by exporting the database and changing some of the strings found within the database. The Firefox SQLite Manager add-on can be used to export the database, but you need to manually make changes to the database before it's ready for import to MySQL.
Java Database Connectivity, or JDBC, is a connection resource in Java. It connects to a database server and returns a list of information that you can scroll through and display data on your Java forms. The JDBC library controls all of the connections and translations to get a result set from a database. You are responsible for telling the JDBC connection the code you want to run to get the information.
Oracle supplies a number of ways to write and use COUNT functions that include a GROUP BY clause. Although the COUNT function in Procedural Language-Structured Query Language -- PL/SQL -- has a standard syntax and definition, applying differing parameters with regard to the GROUP BY clause allows COUNT/GROUP BY queries to produce a variety of simple to complex results. Knowledge of the different criteria -- the rules -- for writing COUNT/GROUP BY queries will help you combine these elements into correct, cohesive Pl/SQL statements.
The SQL language adds flexibility for dynamic content, so you can insert and retrieve information from the database. SQL has some strict rules, however, to create variables, call functions and set up blocks of code such as IF blocks or WHILE statements. These rules must be adhered to, or the SQL server returns an error.
CPanel is an add-on program for Apache servers that host services use to give customers the ability to manage their own virtual server. CPanel has a section where the customer can create a new database or manage the current databases. In some instances, creating or managing CPanel causes errors and the changes to the database fail.
IBM's QMF or Query Management Facility is a set of tools that help businesses extract meaningful information from the data they collect and store in their databases. Within a database, information is organized as one or more collections of data called datasets. QMF includes the tools you need to assemble and organise the information you glean from datasets into useful reports and charts.
Horizontal tab characters can cause formatting errors in Oracle output because computer operating systems do not always look at tabs the same. With a Unix OS, the presence of a tab means "move to the right until the current column is a multiple of 8." For Windows and Mac OS X, a tab is interpreted as a multiple of 4. Custom tab configurations sometimes set tabs to multiples of 2. Replacing “chr(9)” -- the ASCII code for a tab -- with a set number of spaces ensures the format of Oracle output remains consistent no matter which operating system you…
A desktop DBMS, or database management system, is computer software that combines data organization, input screens and other tools in a compact, friendly package. The DBMS is a self-contained software development system that includes its own programming language. You can create useful applications with a desktop DBMS more quickly than with a large-scale commercial database, although a commercial database supports more users.
When you query a MySQL database, the variable to which you assign the query results is actually an instance object. If the object has a boolean value of "false," meaning that the query failed, it doesn't necessarily mean that you can't query the database. If you're having trouble querying a remote MySQL database to which you successfully connected, determine if you're using the right functions and syntax.
The Oracle database server, like any relational database, imposes limits on the size of its input character string fields. The database’s internal structure trades factors such as processing speed and memory consumption for the maximum size of data elements, and Oracle puts an absolute upper limit on character field sizes to keep the database’s structure organized and efficient. The maximum size of strings is more than adequate for most applications, however.
Like other relational database management software, IBM's DB2 supports a feature known as stored procedures, a repository of frequently used Structured Query Language (SQL) code. The stored procedures library in DB2 reduces repetitive typing for common SQL statements and cuts down on typos and other mistakes. In addition to SQL, DB2 lets you save COBOL programs as stored procedures.
Structured Query Language, or SQL, allows programmers to retrieve and manipulate data from a database. DB2 SQL is a slightly different variation of SQL designed for the IBM DB2 database. It is essentially the same thing, however, as it relies on the same basic clauses, including but not limited to SELECT, FROM, WHERE, ORDER BY, INNER JOIN, OUTER JOIN, INSERT TABLE and INSERT INTO clauses.
The sole function of a MySQL cursor is to get and display database records through query parameters. Although this definition may sound simple, the truth is that, because cursors operate differently and return different results from typical SELECT statements, knowing how and when to use MySQL cursors can sometimes be confusing. In general, MySQL cursors are an appropriate choice for processing data rows that contain multiple tables or for when you want to retrieve and process specific rows within a group. A short tutorial can provide basic information on how to accomplish this task.
Before a program gains access to the information in an Oracle 11g database, it must open a connection, providing parameters that identify who the user is and how the program uses data. All the parameters go into a short piece of text called a database connection string. The program opens the database by sending the string to the database server. Oracle creates a connection only if the string is correct and complete.
Developers who use MySQL databases don't have to learn too much about the internal mechanics of how the software works to incorporate them into their projects. But if you as a developer are suddenly receiving a MySQL 1030 error, it means you are going to have to learn a bit about how MySQL stores data, optimizes queries, and how to fix a broken database file.
The outermost layer of the Unix operating system is called the shell -- it's the interface between the user and the OS. Unix provides several shell programming formats that follow a common basic pattern. The C Shell, Korn Shell and Bourne Shell are popular scripting languages. A user at the Unix console types commands at the "prompt," which is indicated as a "$" sign by default. A shell script is a program that is interpreted by the shell. It is treated just like any Unix shell command at the prompt as follows: $ run_sql_script.sh > sql_report.prn
SQL triggers are portions of SQL code that are run on a certain event or when the database state matches specified conditions. Though the syntax for setting and deleting triggers varies slightly across different database systems, triggers are commonplace in virtually every large-scale database project. Database developers often use SQL triggers for automated log or analytic functionality, as they can be configured to create or update the database after a query is run.
You might want to cancel a repair process on your MySQL server if, for example, the process has stalled and become unresponsive. MySQL incorporates a repair tool that allows developers to run processes aimed at repairing specific tables in a database. You can cancel a repair process by typing two specific commands in your MySQL console.
The Oracle database is an object-relational database management system consisting of an application and data storage. A trigger is a named program stored in an Oracle database and executed for a specific event. The event can be a database manipulation, a definition or operation associated with a table, or a view, schema or database. Triggers are enabled by default in Oracle. Examples of triggers associated with database manipulation include DELETE, INSERT and UPDATE statements.
Data mining is a process that analyzes data from different viewpoints and produces information sets organized in a concise manner. Applications then use this information for a variety of purposes. For example, the information could demonstrate methods to increase productivity and revenue or reduce costs and waste. Data mining finds connections or patterns between different fields in databases. Oracle uses a process to harvest the data that protects the integrity of the original information.
IBM’s DB2 is a relational database manager, the first commercial offering to use the industry-standard Structured Query Language, or SQL. As with other modern database systems, such as Oracle or Microsoft’s SQL Server, DB2 databases are composed of tables, each of which is made up of one or more items called fields. The database defines each field as containing data in one of 27 different available types.
SQLite software takes an unusual approach to database management, compared to offerings such as IBM’s DB2 and Microsoft’s SQL Server. SQLite does not have a separate database server program; instead, it becomes part of the application that uses the database. The software's highly efficient design implements most of the SQL-92 standard while avoiding the heavy use of computing resources usually encountered with database management software.
The MySQL database allows you to store images in a table field data type called a "BLOB." A BLOB stores binary information, so the image and its data are stored for future use, and you do not need to store the file on a Web server. Instead, the database table loads the file in the table. You use MySQL's Query Browser to load the image.
Extraction is the first step in moving data from an operational Oracle database to a destination such as a Data warehouse. While it may seem a simple task, copying data from a source system can be time-consuming and difficult, and because the source system is operational, you must ensure the extraction method does not affect performance or the availability of source system data. The best way to accomplish this, according to Oracle, is by using offline extraction and transportable tablespaces.
Triggers are SQL processes that are "fired" when a particular data condition holds for a table. The database application programmer teams with the database administrator to write triggers for tables. A trigger may or may not return a result set.
A control file is a backup of your database, so you can use it to create a new database from the Oracle backup. You use the Oracle command line utility to restore the database. You can give the database the same name as the backed up database, or you can give it a new name such as a reporting server name for end-user reports on the live server's data.
In simple terms, a role is a collection of permissions or privileges and other roles. This is in contrast with privileges that give database users distinct rights to access another user’s object or to use specific SQL statements. The two types of privileges available in an Oracle database are object privileges and system privileges. Object privileges give users permissions to database objects or another user’s objects; system privileges are permissions that allow users to perform powerful database operations. To determine the system privileges associated with roles and users in the database, use the DBA_SYS_PRIVS data dictionary view to determine the…
The Oracle database engine has a "link" feature that links an external database to your local Oracle database. You can use a linked database to copy database tables from one server to another using standard Oracle PL/SQL code. This feature when you need to transfer tables between two Oracle servers to move the data to a new server.
