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The performance of a query plan is determined largely by the order in which the tables are joined. For example, when joining 3 tables A, B, C of size 10 rows, 10,000 rows, and 1,000,000 rows, respectively, a query plan that joins B and C first can take several orders-of-magnitude more time to execute than one that joins A and C first.
Database tuning describes a group of activities used to optimize and homogenize the performance of a database.It usually overlaps with query tuning, but refers to design of the database files, selection of the database management system (DBMS) application, and configuration of the database's environment (operating system, CPU, etc.).
FQL enables you to use a SQL-style interface to query the data exposed by the Graph API. It provides advanced features not available in the Graph API. [3] Gellish English is a language that can be used for queries in Gellish English Databases, for dialogues (requests and responses) as well as for information modeling and knowledge modeling; [4]
In various SQL implementations, a hint is an addition to the SQL standard that instructs the database engine on how to execute the query. For example, a hint may tell the engine to use or not to use an index (even if the query optimizer would decide otherwise).
The following example of a SELECT query returns a list of expensive books. The query retrieves all rows from the Book table in which the price column contains a value greater than 100.00. The result is sorted in ascending order by title. The asterisk (*) in the select list indicates that all columns of the Book table should be included in the ...
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He is the author of two books on IBM's DB2 UDB, and more than 50 technical papers. He contributed a chapter (and the cover photograph) to the 2003 book XQuery from the Experts, ISBN 0-321-18060-7. He contributed a chapter titled Sharing Our Planet to the 1997 book Beyond Calculation: the Next Fifty Years of Computing, ISBN 0-387-94932-1.
Only the Magic, Grizzlies and Nuggets draw more fouls per game than Houston, with bull-in-a-china-shop Şengün leading the pack at 5.5 per game — tied with Kevin Durant for eighth in the NBA ...