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standard SQL also emerged as a standard on Unix-based computer systems, whose popularity accelerated in the 1980s As personal computers became more powerful and were linked in local area networks, they needed more sophisticated database management PC database vendors embraced SQL as the solution to these needs, and minicomputer database vendors moved "down market" to compete in the emerging PC local area network market Through the early 1990s, steadily improving SQL implementations and dramatic improvements in processor speeds made SQL a practical solution for transaction processing applications Finally, SQL became a key part of the client/server architecture that used PCs, local area networks, and network servers to build much lower cost information processing systems SQL's supremacy in the database world has not gone unchallenged By the early 1990s, object-oriented programming had emerged as the method of choice for applications development, especially for personal computers and their graphical user interfaces.

attribute that uniquely identifies a row in the dimension table The natural key SKU (an acronym for stock keeping unit ) uniquely identifies a product in the source system The designation of the remaining attributes indicates how to respond if a change occurs on the source type 1 changes will result in overwrites; type 2 changes will trigger the insertion of a new row Because type 2 changes are possible, a single product may have multiple rows in the dimension The housekeeping column current_version indicates which is current Beneath the table diagram, an instance grid shows the current content of the product table Each time the load is executed, this table must be modified with new and changed data Right now, it contains several rows of data.

SQL HD Test This utility can be used to test the speed of disk I/O on your current system. It can be useful in determining the impact of redundant array of independent disks (RAID) or other hardware-level modifications you might have made to your system. The tool is rough around the edges, so you ll need to make sure you understand the various commands and switches before running the program successfully. The results will be information similar to what you might receive when you run the Windows NT Performance Monitor, but the tests focus more on issues related to database server performance.

If you look closely, you will see that these five rows correspond to four products in the source system: SKUs A-0033, A-1011, B-3691, and Z-3320 The Twine Spool (B-3691) appears three times, presumably because it has already undergone some slow changes One of these versions is flagged as Current The bottom of the diagram shows some source records that are being processed as part of a nightly load These records have already passed through the first three steps in the flow, which fetched the source data and assembled what is shown The first record in this group bears the SKU S-8472 Step 14 in the dimension load process calls for searching the existing dimension table for this natural key value For S-8472, the lookup does not find a match; the record is new The warehouse has never encountered this SKU before.

The object model, with its model of objects, classes, methods, and inheritance, did not provide an ideal fit with relational model of tables, rows, and columns of data A new generation of venture capital-backed "object database" companies sprang up, hoping to make relational databases and their vendors obsolete, just as SQL had done to the earlier, nonrelational vendors However, SQL and the relational model have more than withstood the challenge to date Annual revenues for object-oriented databases are measured in the hundreds of millions of dollars, at best, while SQL and relational database systems, tools, and services produce tens of billions of dollars As SQL grew to address an ever-wider variety of data management tasks, the "one-sizefits-all" approach showed serious strain By the late 1990s, "database management" was no longer a monolithic market Specialized database systems sprang up to support different market needs.

This by no means is an exhaustive list of all the tools and utilities included in the BackOffice 4.5 Resource Kit. In this section, I ve listed only those tools and utilities that might be of use to database and systems administrators interested in testing backup and recovery options. For more information on the Resource Kit, see www.microsoft.com/backoffice.

It will be assigned a surrogate key (step 19) and be added to the product dimension table (step 110) Each of the remaining SKUs in the example is already represented in the product dimension table They must now be examined to determine whether they contain type 1 or type 2 changes..