Data Source Configuration Properties¶
The configuration properties of a JDBC or an ODBC data source, also called source configuration, specify certain characteristics of the underlying source such as the operations they support.
The Execution Engine uses this information to know which operations are supported by the source, in order to push down to the data source as much processing as possible to optimize response times and minimize traffic through the network.
Usually, users do not need to change these settings since Virtual DataPort automatically uses suitable configurations for most common data sources.
You can define them in the “Source configuration” tab of the data source or by adding them
to the statement
The table below lists the properties you can configure in the
SOURCECONFIGURATION clause of the data sources. On the left column, you have the name of each property;
on the right column, the label of this property in the administration tool, in the tab “Source configuration” of the data source.
To find the meaning of a property, go to the section Data Source Configuration Properties of the Administration Guide.
|Property Name in SOURCECONFIGURATION Clause||Property Name|
|ALLOWFORUPDATE||Allow for UPDATE clause|
|ALLOWLITERALASPARAMETER||Allow literal as parameter|
|DELEGATEAGGREGATEFUNCTIONS||Delegate aggregate functions list|
|DELEGATEALLOPERATORS||Delegate all operators|
|DELEGATEARRAYLITERAL||Delegate array literal|
|DELEGATE_BINARY_ORDERBY_COLLATION||Delegate binary ORDER BY collation|
|DELEGATECOMPOUNDFIELDPROJECTION||Delegate compound field projection|
|DELEGATEFETCH||Delegate FETCH clause|
|DELEGATEGROUPBY||Delegate GROUP BY clause|
|DELEGATEHAVING||Delegate HAVING clause|
|DELEGATEINNERJOIN||Delegate INNER JOIN|
|DELEGATEINVALIDNUMBERLITERALSASNULL||Delegate invalid number literals as NULL|
|DELEGATELEFTFUNCTION||Delegate left function|
|DELEGATELEFTLITERAL||Delegate left literal|
|DELEGATENATURALOUTERJOIN||Delegate natural OUTER JOIN|
|DELEGATENOTCONDITION||Delegate NOT condition|
|DELEGATEOFFSET||Delegate OFFSET clause|
|DELEGATE_OFFSET_RESTRICTION||Delegate OFFSET clause restriction|
|DELEGATEOPERATORSLIST||Delegate operators list|
|DELEGATEORCONDITION||Delegate OR condition|
|DELEGATEORDERBY||Delegate ORDER BY|
|DELEGATE_ORDERBY_COLLATION_MODIFI ER||Delegate ORDER BY collation modifier|
|DELEGATEREGISTERLITERAL||Delegate register literal|
|DELEGATERIGHTFIELD||Delegate right field|
|DELEGATERIGHTFUNCTION||Delegate right function|
|DELEGATERIGHTLITERAL||Delegate right literal|
|DELEGATESCALARFUNCTIONS||Delegate scalar functions list|
|NESTEDJOINWITHBLOCKSSTRATEGY||Nested join optimization syntax|
|SUPPORTSAGGREGATEFUNCTIONSOPTIONS||Supports modifier in aggregate function|
|SUPPORTSBATCHINSERT||Supports batch inserts|
|SUPPORTSBRANCHOUTERJOIN||Supports branch OUTER JOIN|
|SUPPORTSCLOBINBATCH||Supports CLOBs in batch inserts|
|SUPPORTSEQOUTERJOINOPERATOR||Supports Eq OUTER JOIN|
|SUPPORTSEXPLICITCROSSJOIN||Supports explicit CROSS JOIN|
|SUPPORTSFULLEQOUTERJOIN||Supports full Eq OUTER JOIN|
|SUPPORTSFULLNOTEQOUTERJOIN||Supports full NotEq OUTER JOIN|
|SUPPORTSFUSINGINUSINGANDNATURALJOIN||Supports fusing in USING and natural JOIN|
|SUPPORTSGROUPBYLITERALASPARAMETER||Supports GROUP BY literals as parameters|
|SUPPORTSJOINONCONDITION||Supports JOIN ON Condition|
|SUPPORTSNATURALJOIN||Supports NATURAL JOIN|
|SUPPORTS_ORDERBY_BINARY_COLLATION||Supports binary ORDER BY collation|
|SUPPORTSORDERBYEXPRESSION||Supports ORDER BY expressions|
|SUPPORTSRIGHTDEEPJOIN||Supports right deep n-joins|
|SUPPORTSUSINGJOIN||Supports USING JOIN|
CONTAINS Operator Configuration Properties¶
CONTAINS operator allows executing complex Boolean keyword
searches on text-type attributes from an external index of unstructured
data (e.g. Aracne and Google Search data sources).
The syntax of the search language on unstructured data is described in the section Syntax of Search Expressions for the Contains Operator.
Custom-type wrappers can also specify the search language capacities that are supported through Operator Configuration Properties. This way, other external indexes besides Aracne and Google Search ones can be imported in Virtual DataPort. This section describes these properties.
- Supports And. This takes the value
trueif searches with the logic operator AND are supported, and the value false, if they are not.
- Supports OR. This takes the value
trueif searches with the logic operator OR are supported, and the value false, if they are not.
- Supports Not. This takes the value
trueif searches with the logic operator NOT are supported and the value false, if they are not.
- Supports Exact Search. This takes the value
trueif searches by exact phrase are supported and the value false, if they are not.
- Supports One Wildcards First Position. This takes the value
true, if the wildcard matches with just one character (i.e. the wildcard
?) in the first position of a term are supported.
- Supports One Wildcards Rest Position. This takes the value true if the wildcard matches with just one character (i.e. the wildcard “?”) in the remaining positions of a term other than the first are supported.
- Supports Multi Wildcards First Position. This takes the value
trueif wildcards that match with multiple characters (i.e. the wildcard
*) are supported in the first position of a term.
- Supports Multi Wildcards Rest Position. This takes the value
true, if wildcards that match with multiple characters (i.e. the wildcard
*) are supported in the remaining positions of a term other than the first.
- Supports Fuzzy Terms without Minimum Relevance. This takes the
trueif fuzzy searches without specifying a minimum similarity threshold are supported.
- Supports Fuzzy Terms with Minimum Relevance. This takes the value
true, if fuzzy searches specifying a minimum similarity threshold are supported.
- Supports Proximity Terms Without Maximum Distance. This takes the
true, if searches by proximity without specifying a maximum distance among the terms are supported.
- Supports Proximity Terms With Maximum Distance. This takes the
true, if searches by proximity specifying a maximum distance among the terms are supported.
- Supports Boosting Terms without Boosting Factor. This takes the
true, if the relevance boosting specification is supported for a term without specifying a specific boosting factor.
- Supports Boosting Terms with Boosting Factor. This takes the value
true, if the relevance boosting specification is supported for a term specifying a specific boosting factor.
- Supports Inclusive Range Search. This takes the value
true, if range searches are supported (inclusive).
- Supports Exclusive Range Search. This takes the value
true, if range searches are supported (exclusive).
- Supports Field Grouping. This takes the value
true, if the combination of logic operators AND and OR is supported using brackets. For example:
title contains '(term1 AND term2) OR (term3)'
- Supports Grouping. This takes the value true, if the combination of
logic operators AND and OR in different query conditions is
supported. For example:
title contains 'term1' AND (content contains 'term2' OR summary contains 'term3')