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| - | ~~NOTOC~~ | ||
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| - | ====== Administration: Omnidex Features ====== | ||
| - | |||
| - | ===== Omnidex Segments ===== | ||
| - | |||
| - | [[admin:features:segments:home|Overview]] | | ||
| - | **[[admin:features:segments:creating|Creating Segments]]** | | ||
| - | [[admin:features:segments:queries|Querying Segments]] | | ||
| - | [[admin:features:segments:attaching|Attaching Segments]] |[[admin:features:segments:dropping|Dropping Segments]] | | ||
| - | [[admin:features:segments:archiving|Archiving Segments]] | ||
| - | ---- | ||
| - | |||
| - | ==== Creating Segments ==== | ||
| - | |||
| - | === Segment Types === | ||
| - | |||
| - | Omnidex Segments are separated into types that describe their content and their format: | ||
| - | |||
| - | |||
| - | |< 100% 10% 15% 75% >| | ||
| - | ^ Type ^ File Extensions ^ Description ^ | ||
| - | | INDEX | .odxid | This segment contains index pointers representing the rows that match the criteria. | | ||
| - | | DATA | .dat | This segment contains data in binary format without delimiters. | | ||
| - | | DELIMITED | .txt, .csv and .tdf | This segment contains data in character format, with one value per line. | | ||
| - | |||
| - | Omnidex Segments are separated into two types of persistence that describe how filenames and file cleanup are handled: | ||
| - | |||
| - | ^ Persistence ^ Description ^ | ||
| - | | TEMPORARY | Object names are unique to a connection, but may repeat across connections. Omnidex automatically manages the filenames for these segments. This segment can be dropped explicitly if needed; otherwise it will automatically dropped when the connection ends. Segments are temporary by default. | | ||
| - | | PERMANENT | Object names are unique to a connection, but may repeat across connections. The user must provide unique filenames for these segments; otherwise, the object name is used as the filename. This segment will only be deleted if explicitly dropped. | | ||
| - | |||
| - | === Creating Segments === | ||
| - | |||
| - | Segments are easily creating using the [[dev:sql:statements:create_segment:home|CREATE SEGMENT]] statement. The following example shows a series of segments being created in a multi-step query. | ||
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| - | <code> | ||
| - | > ; Create a series of index and data segment files, and then reuse them | ||
| - | > ; in a final query. | ||
| - | > | ||
| - | > | ||
| - | > ; Create a temporary index segment for Individuals in Denver, CO | ||
| - | > create temporary index segment PART_1 | ||
| - | >> as (select INDIVIDUALS.$UNIQUEKEY | ||
| - | >> from INDIVIDUALS | ||
| - | >> join HOUSEHOLDS on INDIVIDUALS.HOUSEHOLD = HOUSEHOLDS.HOUSEHOLD | ||
| - | |||
| - | >> where STATE = 'CO' and | ||
| - | >> CITY = 'Denver') | ||
| - | >> with delete; | ||
| - | Segment PART_1 created with 37 rows | ||
| - | |||
| - | > ; Create a temporary index segment for Individuals in Phoenix, AZ; | ||
| - | -> create temporary index segment PART_2 | ||
| - | >> as (select INDIVIDUALS.$UNIQUEKEY | ||
| - | >> from INDIVIDUALS | ||
| - | >> join HOUSEHOLDS on INDIVIDUALS.HOUSEHOLD = HOUSEHOLDS.HOUSEHOLD | ||
| - | >> where STATE = 'AZ' and | ||
| - | >> CITY = 'Phoenix') | ||
| - | >> with delete; | ||
| - | Segment PART_2 created with 27 rows | ||
| - | |||
| - | > ; Create a temporary index segment for Individuals born since 1980; | ||
| - | > create temporary index segment PART_3 | ||
| - | >> as (select INDIVIDUALS.$UNIQUEKEY | ||
| - | >> from INDIVIDUALS | ||
| - | >> where BIRTHDATE >= 'January 1, 1980') | ||
| - | >> with delete; | ||
| - | Segment PART_3 created with 1,882 rows | ||
| - | </code> | ||
| - | |||
| - | |||
| - | ==== ==== | ||
| - | **[[admin:features:segments:querying|Next]]** | ||
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| - | |||
| - | ====== Additional Resources ====== | ||
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| - | See also: | ||
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