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摘要： Introduction to Oracle UtilitiesOracle's database utilities let you perform the following tasks:- High-speed movement of data and metadata from one database to another using Data Pump Export and Import- Extract and manipulate complete representations of the metadata for database objects, using t 阅读全文

摘要： Introduction to Client/Server Architecture In the Oracle database system environment, the database application and the database are separated into two parts: afront-end or client portion, and a back-end or server portion--hence the term client/server architecture. The client runs the database application that accesses database information and interacts with a user through the keyboard, screen, and pointing device, such as a mouse. The server runs the Oracle software and handles the functions 阅读全文

摘要： All connected Oracle users must run two modules of code to access an Oracle database instance. - Application or Oracle tool: A database user runs a database application (such as a precompiler program) or an Oracle tool (such as SQL*Plus), which issues SQL statements to an Oracle database. - Oracle database server code: Each user has some Oracle database code executing on his or her behalf, which interprets and processes the application's SQL statements. 阅读全文

摘要： The basic memor structures associated with Oracle include: - System Global Area (SGA), which is shared by all server and background processes. - Program Global Areas (PGA), which is private to each server and background process; there is on PGA for each process. 阅读全文

摘要： One of the most important parts of an Oracle database is its data dictionary, which is a ready-only set of tables that provides information about the database. A data dictionary contains: - The definitions of all schema objects in the database (tables, views, indexes, clusters, synonyms, sequences, procedures, functions, packages, triggers, and so on) - How much space has been allocated for, and is currently used by, the schema objects. - Default values for columns - The names of Oracle user 阅读全文

摘要： A schema is a collection of logical structures of data, or schema objects. A schema is owned by database user and has the same name as that user. Each User owns a single schema. Schema objects can be created and manipulated with SQL and include the following types of objects: Clusters; Database link 阅读全文

摘要： A transaction is a logical unit of work that contains one or more SQL statements. A transaction is an atomic unit. The effects of all the SQL statements in a transaction can be either all committed (applied to the database) or all rolled back (undone from the database). A transaction begins with the first executable SQL statement. A transaction ends when it is committed or rolled back, either explicitly with a COMMIT or ROLLBACK statement or implicitly when a DDL statement is issued. 阅读全文

摘要： Oracle stores data locically in tablespaces and physically in datafiles associated with the corresponding tablespace. 阅读全文

摘要： Oracle allocates logical database space for all data in a database. The units of database space allocation are data blocks, extents, and segments 阅读全文

摘要： Oracle includes datatypes to handle all the types of rich Internet content such as relational data, object-relational data, XML, text, audio, video, image, and spatial. These datatypes appear as native types in the database. They can all be queried using SQL. A single SQL statement can include data beloging to any all of these datatypes. 阅读全文