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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 wikiPageRevisionID "593949135".
- Partial_index hasPhotoCollection Partial_index.
- Partial_index subject Category:Database_management_systems.
- Partial_index subject Category:PostgreSQL.
- Partial_index type Abstraction100002137.
- Partial_index type Code106355894.
- Partial_index type CodingSystem106353757.
- Partial_index type Communication100033020.
- Partial_index type DatabaseManagementSystem106588785.
- Partial_index type DatabaseManagementSystems.
- Partial_index type Software106566077.
- Partial_index type Writing106359877.
- Partial_index type WrittenCommunication106349220.
- 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 label "部分インデックス".
- 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 sameAs Partial_index.
- Partial_index wasDerivedFrom Partial_index?oldid=593949135.
- Partial_index isPrimaryTopicOf Partial_index.