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257 Replication, Distribution, and External Data
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Oracle provides support for replication and distributed transactions with two-phase commit
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2571 Replication
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Oracle supports several types of replication (See Section 1921 for an introduction to replication) In its simplest form, data in a master site are replicated to other sites in the form of snapshots (The term snapshot in this context should not be confused with the concept of a read-consistent snapshot in the context of the concurrency model) A snapshot does not have to contain all the master data it can, for example, exclude certain columns from a table for security reasons Oracle supports two types of snapshots: read-only and updatable An updatable snapshot can be modi ed at a slave site and the modi cations propagated to the master table However, read-only snapshots allow for a wider range of snapshot de nitions For instance, a read-only snapshot can be de ned in terms of set operations on tables at the master site Oracle also supports multiple master sites for the same data, where all master sites act as peers A replicated table can be updated at any of the master sites and the update is propagated to the other sites The updates can be propagated either asynchronously or synchronously For asynchronous replication, the update information is sent in batches to the other master sites and applied Since the same data could be subject to con icting modi cations at different sites, con ict resolution based on some business rules might be needed Oracle provides a number of of built-in con ict resolution methods and allows users to write their own if need be With synchronous replication, an update to one master site is propagated immediately to all other sites If the update transaction fails at any master site, the update is rolled back at all sites
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2572 Distributed Databases
Oracle supports queries and transactions spanning multiple databases on different systems With the use of gateways, the remote systems can include non-Oracle databases Oracle has built-in capability to optimize a query that includes tables at different sites, retrieve the relevant data, and return the result as if it had been a normal, local query Oracle also transparently supports transactions spanning multiple sites by a built-in two-phase-commit protocol
2573 External Data Sources
Oracle has several mechanisms for supporting external data sources The most common usage is in data warehousing when large amounts of data are regularly loaded from a transactional system
25731 SQL*Loader
Oracle has a direct load utility, SQL*Loader, that supports fast parallel loads of large amounts of data from external les It supports a variety of data formats and it can perform various ltering operations on the data being loaded
25732 External Tables
Oracle allows external data sources, such as at les, to be referenced in the from clause of a query as if they were regular tables An external table is de ned by metadata that describe the Oracle column types and the mapping of the external data into those columns An access driver is also needed to access the external data Oracle provides a default driver for at les The external table feature is primarily intended for extraction, transformation, and loading (ETL) operations in a data warehousing environment Data can be loaded into the data warehouse from a at le using create table table as select from < external table > where By adding operations on the data in either the select list or where clause, transformations and ltering can be done as part of the same SQL statement Since these operations can be expressed either in native SQL or in functions written in PL/SQL or Java, the external table feature provides a very powerful mechanism for expressing all kinds of data transformation and ltering operations For scalability, the access to the external table can be parallelized by Oracle s parallel execution feature
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