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The SQL:1999 OLAP features (Section 2223) have been speci ed as an amendment to the earlier version of the SQL:1999 standard There are several other parts under development, including Part 7: SQL/Temporal deals with standards for temporal data Part 9: SQL/MED (Management of External Data) de nes standards for interfacing an SQL system to external sources By writing wrappers, system designers can treat external data sources, such as les or data in nonrelational databases, as if they were foreign tables Part 10: SQL/OLB (Object Language Bindings) de nes standards for embedding SQL in Java The missing numbers (Parts 6 and 8) cover features such as distributed transaction processing and multimedia data, for which there is as yet no agreement on the standards The multimedia standards propose to cover storage and retrieval of text data, spatial data, and still images
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The ODBC standard is a widely used standard for communication between client applications and database systems ODBC is based on the SQL Call-Level Interface (CLI) standards developed by the X/Open industry consortium and the SQL Access Group, but has several extensions The ODBC API de nes a CLI, an SQL syntax de nition, and rules about permissible sequences of CLI calls The standard also de nes conformance levels for the CLI and the SQL syntax For example, the core level of the CLI has commands to connect to a database, to prepare and execute SQL statements, to get back results or status values and to manage transactions The next level of conformance (level 1) requires support for catalog information retrieval and some other features over and above the core-level CLI; level 2 requires further features, such as ability to send and retrieve arrays of parameter values and to retrieve more detailed catalog information ODBC allows a client to connect simultaneously to multiple data sources and to switch among them, but transactions on each are independent; ODBC does not support two-phase commit A distributed system provides a more general environment than a client server system The X/Open consortium has also developed the X/Open XA standards for interoperation of databases These standards de ne transaction-management primitives (such as transaction begin, commit, abort, and prepare-to-commit) that compliant databases should provide; a transaction manager can invoke these primitives to implement distributed transactions by two-phase commit The XA standards are independent of the data model and of the speci c interfaces between clients and databases to exchange data Thus, we can use the XA protocols to implement a distributed transaction system in which a single transaction can access relational as well as object-oriented databases, yet the transaction manager ensures global consistency via two-phase commit
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Standardization
There are many data sources that are not relational databases, and in fact may not be databases at all Examples are at les and email stores Microsoft s OLE-DB is a C++ API with goals similar to ODBC, but for nondatabase data sources that may provide only limited querying and update facilities Just like ODBC, OLE-DB provides constructs for connecting to a data source, starting a session, executing commands, and getting back results in the form of a rowset, which is a set of result rows However, OLE-DB differes from ODBC in several ways To support data sources with limited feature support, features in OLE-DB are divided into a number of interfaces, and a data source may implement only a subset of the interfaces An OLE-DB program can negotiate with a data source to nd what interfaces are supported In ODBC commands are always in SQL In OLE-DB, commands may be in any language supported by the data source; while some sources may support SQL, or a limited subset of SQL, other sources may provide only simple capabilities such as accessing data in a at le, without any query capability Another major difference of OLE-DB from ODBC is that a rowset is an object that can be shared by multiple applications through shared memory A rowset object can be updated by one application, and other applications sharing that object would get noti ed about the change The Active Data Objects (ADO) API, also created by Microsoft, provides an easyto-use interface to the OLE-DB functionality, which can be called from scripting languages, such as VBScript and JScript
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