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ORACLE DATABASE 10G SQL JASON PRICE PDF

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A DBA can impose maximum quotas on storage per user within each tablespace. The partitioning feature was introduced in Oracle 8.

Specific partitions can then be added or dropped to help manage large data sets. Oracle database management tracks its computer data storage with the help of information stored in the SYSTEM tablespace.

A data dictionary consists of a special collection of tables that contains information about all user- objects in the database. Since version 8 i , the Oracle RDBMS also supports "locally managed" tablespaces that store space management information in bitmaps in their own headers rather than in the SYSTEM tablespace as happens with the default "dictionary-managed" tablespaces. At the physical level, data files comprise one or more data blocks , where the block size can vary between data files.

Data files can occupy pre-allocated space in the file system of a computer server, use raw disk directly, or exist within ASM logical volumes.

Product description After the installation process sets up sample tables, the user logs into the database with the username scott and the password tiger. Other default schemas [82] [83] include:. Each Oracle instance allocates itself an SGA when it starts and de-allocates it at shut-down time.

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The information in the SGA consists of the following elements, each of which has a fixed size, established at instance startup:. Every Oracle database has one or more physical datafiles, which contain all the database data. The data of logical database structures, such as tables and indexes, is physically stored in the datafiles allocated for a database. Data in a datafile is read, as needed, during normal database operation and stored in the memory cache of Oracle Database.

For example, if a user wants to access some data in a table of a database, and if the requested information is not already in the memory cache for the database, then it is read from the appropriate datafiles and stored in memory. Modified or new data is not necessarily written to a datafile immediately. To reduce the amount of disk access and to increase performance, data is pooled in memory and written to the appropriate datafiles all at once. The library cache [88] stores shared SQL, caching the parse tree and the execution plan for every unique SQL statement.

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This reduces the amount of memory needed and reduces the processing-time used for parsing and execution planning. The data dictionary comprises a set of tables and views that map the structure of the database. Oracle databases store information here about the logical and physical structure of the database.

The data dictionary contains information such as:. The Oracle instance frequently accesses the data dictionary to parse SQL statements. Oracle operation depends on ready access to the data dictionary—performance bottlenecks in the data dictionary affect all Oracle users.

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Because of this, database administrators must make sure that the data dictionary cache [89] has sufficient capacity to cache this data. Without enough memory for the data-dictionary cache, users see a severe performance degradation.

The Program Global Area [90] [91] or PGA memory-area of an Oracle instance contains data and control-information for Oracle's server-processes or background process. The size and content of the PGA depends on the Oracle-server options installed. This area consists of the following components:. The Oracle RDBMS typically relies on a group of processes running simultaneously in the background and interacting to monitor and expedite database operations.

Typical operating environments might include — temporarily or permanently — some of the following individual processes shown along with their abbreviated nomenclature: Oracle Database terminology distinguishes different computer-science terms in describing how end-users interact with the database:.

Oracle databases control simultaneous access to data resources with locks alternatively documented as "enqueues". Oracle locks fall into three categories: Database administrators control many of the tunable variations in an Oracle instance by means of values in a parameter file. Layers or modules in the kernel depending on different releases may include the following given with their inferred meaning: Oracle Resource Manager aims to allocate CPU resources between users and groups of users when such resources become scarce.

Oracle Corporation has stated in product announcements that manageability for DBAs improved from Oracle9i to 10g. Want to Read saving…. Want to Read Currently Reading Read. Other editions. Enlarge cover. Error rating book. Refresh and try again. Open Preview See a Problem? Details if other: Thanks for telling us about the problem.

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Return to Book Page. Lisa McClain. Publisher's Note: Products downloadd from Third Party sellers are not guaranteed by the publisher for quality, authenticity, or access to any online entitlements included with the product.

Developed in compliance with the new SQL specification, this definitive resource explains how to use the latest Oracle Database 10g features, and much more.

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