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- Partial_index abstract "In databases, a partial index, also known as filtered index is an index which has some condition applied to it so that it includes a subset of rows in the table.This allows the index to remain small, even though the table may be rather large, and have extreme selectivity.Suppose you have a transaction table where entries start out with STATUS = 'A' (active), and then may pass through other statuses ('P' for pending, 'W' for "being worked on") before reaching a final status, 'F', at which point it is no longer likely to be processed again.In PostgreSQL, a useful partial index might be defined as:This index would not bother storing any of the millions of rows that have reached "final" status, 'F', and would allow queries looking for transactions that still "need work" to efficiently search via this index.Similarly, a partial index can be used to index only those rows where a column is not null, which will be of benefit when the column usually is null.This index would allow the following query to read only the updated tuples:It is not necessary that the condition be the same as the index criterion; Stonebraker's paper below presents a number of examples with indexes similar to the following:".
- Partial_index wikiPageExternalLink ERL-M89-17.pdf.
- Partial_index wikiPageID "2558484".
- Partial_index wikiPageLength "3316".
- Partial_index wikiPageOutDegree "9".
- Partial_index wikiPageRevisionID "593949135".
- Partial_index wikiPageWikiLink Category:Database_management_systems.
- Partial_index wikiPageWikiLink Category:PostgreSQL.
- Partial_index wikiPageWikiLink Database_index.
- Partial_index wikiPageWikiLink Index_(database).
- Partial_index wikiPageWikiLink Microsoft_SQL_Server.
- Partial_index wikiPageWikiLink PostgreSQL.
- Partial_index wikiPageWikiLink Relational_database_management_system.
- Partial_index wikiPageWikiLink Row_(database).
- Partial_index wikiPageWikiLink SQLite.
- Partial_index wikiPageWikiLink Table_(database).
- Partial_index wikiPageWikiLinkText "Partial index".
- Partial_index wikiPageWikiLinkText "Partial".
- Partial_index wikiPageWikiLinkText "partial index".
- Partial_index wikiPageWikiLinkText "partial indices".
- Partial_index hasPhotoCollection Partial_index.
- Partial_index wikiPageUsesTemplate Template:Reflist.
- Partial_index subject Category:Database_management_systems.
- Partial_index subject Category:PostgreSQL.
- Partial_index hypernym Index.
- Partial_index type Work.
- Partial_index comment "In databases, a partial index, also known as filtered index is an index which has some condition applied to it so that it includes a subset of rows in the table.This allows the index to remain small, even though the table may be rather large, and have extreme selectivity.Suppose you have a transaction table where entries start out with STATUS = 'A' (active), and then may pass through other statuses ('P' for pending, 'W' for "being worked on") before reaching a final status, 'F', at which point it is no longer likely to be processed again.In PostgreSQL, a useful partial index might be defined as:This index would not bother storing any of the millions of rows that have reached "final" status, 'F', and would allow queries looking for transactions that still "need work" to efficiently search via this index.Similarly, a partial index can be used to index only those rows where a column is not null, which will be of benefit when the column usually is null.This index would allow the following query to read only the updated tuples:It is not necessary that the condition be the same as the index criterion; Stonebraker's paper below presents a number of examples with indexes similar to the following:".
- Partial_index label "Partial index".
- Partial_index sameAs 部分インデックス.
- Partial_index sameAs m.07myn7.
- Partial_index sameAs Q7140373.
- Partial_index sameAs Q7140373.
- Partial_index wasDerivedFrom Partial_index?oldid=593949135.
- Partial_index isPrimaryTopicOf Partial_index.