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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

Upside benefit: In another twist, assignment of an account to a territory to benefit a sales representative without increasing the quota is another form of manipulation Local sales managers sometimes assign such accounts temporarily or permanently to a sales person allowing higher pay to be earned against the (incorrectly) unadjusted quota

The appliances support static PAT, sometimes referred to as port address redirection (PAR) PAR is sometimes necessary when your ISP assigns you a single public IP address that

The McGraw Hill Companies, 2001

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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Standards in the area of object-oriented databases have so far been driven primarily by OODB vendors The Object Database Management Group (ODMG) is a group formed by OODB vendors to standardize the data model and language interfaces to OODBs The C++ language interface speci ed by ODMG was discussed in 8 The ODMG has also speci ed a Java interface and a Smalltalk interface The Object Management Group (OMG) is a consortium of companies, formed with the objective of developing a standard architecture for distributed software applications based on the object-oriented model OMG brought out the Object Management Architecture (OMA) reference model The Object Request Broker (ORB) is a component of the OMA architecture that provides message dispatch to distributed objects transparently, so the physical location of the object is not important The Common Object Request Broker Architecture (CORBA) provides a detailed speci cation of the ORB, and includes an Interface Description Language (IDL), which is used to de ne the data types used for data interchange The IDL helps to support data conversion when data are shipped between systems with different data representations

you need to put on the outside interface of your appliance, but you want Internet users to access servers behind your appliance, like a web, DNS, and/or e-mail servers Basically, PAR redirects traffic sent to one IP address and port number to a different IP address and, possibly, to a different port number The following two sections will show you the syntax for configuring PAR as well as a simple example