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Cost Based Optimizer (CBO) and Database Statistics
Cost Based Optimizer (CBO) and Database Statistics

... Exclude dataload tables from your regular stats gathering, unless you know they will be full at the time that stats are gathered. I've found gathering stats for the SYS schema can make the system run slower, not faster. Gathering statistics can be very resource intensive for the server so avoid peak ...
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... PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with rasdaman Community. If not, see www.gnu.org/licenses. For more information please see www.rasdaman.org or contact Peter Baumann via [email protected]. Origina ...
Great Lakes Orthodontics
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ConQuer: Efficient Management of Inconsistent Databases
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... Avoid date time comparisons in lookup; replace with string. Not all sources and targets treat strings with leading or trailing blanks the same. It may be necessary to RTRIM and LTRIM string data prior to using it in a Lookup. Lookups on small tables (<10,000) records can be cached and use ODBC. Look ...
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... in part because there is no commonly accepted consensus data model or query language upon which to base research and development. At a more fundamental level, even the terminology is highly nonstandard. As an example, the terms intrinsic time, logical time, real-world time, and valid time have all b ...
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SQL

SQL (/ˈɛs kjuː ˈɛl/, or /ˈsiːkwəl/; Structured Query Language) is a special-purpose programming language designed for managing data held in a relational database management system (RDBMS), or for stream processing in a relational data stream management system (RDSMS).Originally based upon relational algebra and tuple relational calculus, SQL consists of a data definition language, data manipulation language, and a data control language. The scope of SQL includes data insert, query, update and delete, schema creation and modification, and data access control. Although SQL is often described as, and to a great extent is, a declarative language (4GL), it also includes procedural elements.SQL was one of the first commercial languages for Edgar F. Codd's relational model, as described in his influential 1970 paper, ""A Relational Model of Data for Large Shared Data Banks."" Despite not entirely adhering to the relational model as described by Codd, it became the most widely used database language.SQL became a standard of the American National Standards Institute (ANSI) in 1986, and of the International Organization for Standardization (ISO) in 1987. Since then, the standard has been revised to include a larger set of features. Despite the existence of such standards, though, most SQL code is not completely portable among different database systems without adjustments.
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