HTTP interface for arangosearch Views

Wait at least this many commits between removing unused files in the ArangoSearch data directory (default: 2, to disable use: 0). For the case where the consolidation policies merge segments often (i.e. a lot of commit+consolidate), a lower value causes a lot of disk space to be wasted. For the case where the consolidation policies rarely merge segments (i.e. few inserts/deletes), a higher value impacts performance without any added benefits.

Background: With every “commit” or “consolidate” operation a new state of the View’s internal data structures is created on disk. Old states/snapshots are released once there are no longer any users remaining. However, the files for the released states/snapshots are left on disk, and only removed by “cleanup” operation.

Wait at least this many milliseconds between committing View data store changes and making documents visible to queries (default: 1000, to disable use: 0). For the case where there are a lot of inserts/updates, a higher value causes the index not to account for them and memory usage continues to grow until the commit. A lower value impacts performance, including the case where there are no or only a few inserts/updates because of synchronous locking, and it wastes disk space for each commit call.

Background: For data retrieval, ArangoSearch follows the concept of “eventually-consistent”, i.e. eventually all the data in ArangoDB will be matched by corresponding query expressions. The concept of ArangoSearch “commit” operations is introduced to control the upper-bound on the time until document addition/removals are actually reflected by corresponding query expressions. Once a “commit” operation is complete, all documents added/removed prior to the start of the “commit” operation will be reflected by queries invoked in subsequent ArangoDB transactions, in-progress ArangoDB transactions will still continue to return a repeatable-read state.

Wait at least this many milliseconds between applying consolidationPolicy to consolidate the View data store and possibly release space on the filesystem (default: 10000, to disable use: 0). For the case where there are a lot of data modification operations, a higher value could potentially have the data store consume more space and file handles. For the case where there are a few data modification operations, a lower value impacts performance due to no segment candidates being available for consolidation.

Background: For data modification, ArangoSearch follows the concept of a “versioned data store”. Thus old versions of data may be removed once there are no longer any users of the old data. The frequency of the cleanup and compaction operations are governed by consolidationIntervalMsec and the candidates for compaction are selected via consolidationPolicy.

The consolidation policy to apply for selecting which segments should be merged (default: {})

Background: With each ArangoDB transaction that inserts documents, one or more ArangoSearch-internal segments get created. Similarly, for removed documents, the segments that contain such documents have these documents marked as ‘deleted’. Over time, this approach causes a lot of small and sparse segments to be created. A “consolidation” operation selects one or more segments and copies all of their valid documents into a single new segment, thereby allowing the search algorithm to perform more optimally and for extra file handles to be released once old segments are no longer used.

Sub-properties:

• type (string, optional): The segment candidates for the “consolidation” operation are selected based upon several possible configurable formulas as defined by their types. The currently supported types are:
  • "tier" (default): consolidate based on segment byte size and live document count as dictated by the customization attributes. If this type is used, then below segments* and minScore properties are available.
  • "bytes_accum": consolidate if and only if {threshold} > (segment_bytes + sum_of_merge_candidate_segment_bytes) / all_segment_bytes i.e. the sum of all candidate segment byte size is less than the total segment byte size multiplied by the {threshold}. If this type is used, then below threshold property is available.
• threshold (number, optional): value in the range [0.0, 1.0]
• segmentsBytesFloor (number, optional): Defines the value (in bytes) to treat all smaller segments as equal for consolidation selection (default: 2097152)
• segmentsBytesMax (number, optional): Maximum allowed size of all consolidated segments in bytes (default: 5368709120)
• segmentsMax (number, optional): The maximum number of segments that are evaluated as candidates for consolidation (default: 10)
• segmentsMin (number, optional): The minimum number of segments that are evaluated as candidates for consolidation (default: 1)
• minScore (number, optional): (default: 0)

Expects an object with the attribute keys being names of to be linked collections, and the link properties as attribute values. See arangosearch View Link Properties for details.

The name of the View.

If you enable this option, then the primary key columns are always cached in memory (introduced in v3.9.6, Enterprise Edition only). This can improve the performance of queries that return many documents. Otherwise, these values are memory-mapped and it is up to the operating system to load them from disk into memory and to evict them from memory.

This option is immutable.

See the --arangosearch.columns-cache-limit startup option to control the memory consumption of this cache. You can reduce the memory usage of the column cache in cluster deployments by only using the cache for leader shards, see the --arangosearch.columns-cache-only-leader startup option (introduced in v3.10.6).

A primary sort order can be defined to enable an AQL optimization. If a query iterates over all documents of a View, wants to sort them by attribute values and the (left-most) fields to sort by as well as their sorting direction match with the primarySort definition, then the SORT operation is optimized away. This option is immutable.

Expects an array of objects, each specifying a field (attribute path) and a sort direction ("asc for ascending, "desc" for descending): [ { "field": "attr", "direction": "asc"}, … ]

If you enable this option, then the primary sort columns are always cached in memory (introduced in v3.9.6, Enterprise Edition only). This can improve the performance of queries that utilize the primary sort order. Otherwise, these values are memory-mapped and it is up to the operating system to load them from disk into memory and to evict them from memory.

This option is immutable.

See the --arangosearch.columns-cache-limit startup option to control the memory consumption of this cache. You can reduce the memory usage of the column cache in cluster deployments by only using the cache for leader shards, see the --arangosearch.columns-cache-only-leader startup option (introduced in v3.10.6).

Defines how to compress the primary sort data (introduced in v3.7.1). ArangoDB v3.5 and v3.6 always compress the index using LZ4.

This option is immutable.

• "lz4" (default): use LZ4 fast compression.
• "none": disable compression to trade space for speed.

An array of objects to describe which document attributes to store in the View index (introduced in v3.7.1). It can then cover search queries, which means the data can be taken from the index directly and accessing the storage engine can be avoided.

This option is immutable.

Each object is expected in the following form:

{ "fields": [ "attr1", "attr2", ... "attrN" ], "compression": "none", "cache": false }

• The required fields attribute is an array of strings with one or more document attribute paths. The specified attributes are placed into a single column of the index. A column with all fields that are involved in common search queries is ideal for performance. The column should not include too many unneeded fields, however.

• The optional compression attribute defines the compression type used for the internal column-store, which can be "lz4" (LZ4 fast compression, default) or "none" (no compression).

• The optional cache attribute allows you to always cache stored values in memory (introduced in v3.9.5, Enterprise Edition only). This can improve the query performance if stored values are involved. Otherwise, these values are memory-mapped and it is up to the operating system to load them from disk into memory and to evict them from memory.

  See the --arangosearch.columns-cache-limit startup option to control the memory consumption of this cache. You can reduce the memory usage of the column cache in cluster deployments by only using the cache for leader shards, see the --arangosearch.columns-cache-only-leader startup option (introduced in v3.10.6).

  You may use the following shorthand notations on View creation instead of an array of objects as described above. The default compression and cache settings are used in this case:

  • An array of strings, like ["attr1", "attr2"], to place each attribute into a separate column of the index (introduced in v3.10.3).

  • An array of arrays of strings, like [["attr1", "attr2"]], to place the attributes into a single column of the index, or [["attr1"], ["attr2"]] to place each attribute into a separate column. You can also mix it with the full form:

  [
    ["attr1"],
    ["attr2", "attr3"],
    { "fields": ["attr4", "attr5"], "cache": true }
  ]
  

The storedValues option is not to be confused with the storeValues option, which allows to store meta data about attribute values in the View index.

The type of the View. Must be equal to "arangosearch". This option is immutable.

Maximum number of concurrent active writers (segments) that perform a transaction. Other writers (segments) wait till current active writers (segments) finish (default: 0, use 0 to disable, immutable)

Maximum number of writers (segments) cached in the pool (default: 64, use 0 to disable, immutable)

Maximum memory byte size per writer (segment) before a writer (segment) flush is triggered. 0 value turns off this limit for any writer (buffer) and data is flushed periodically based on the value defined for the flush thread (ArangoDB server startup option). 0 value should be used carefully due to high potential memory consumption (default: 33554432, use 0 to disable, immutable)

The name of the View.

The name of the View.

The name of the View.

Wait at least this many commits between removing unused files in the ArangoSearch data directory (default: 2, to disable use: 0). For the case where the consolidation policies merge segments often (i.e. a lot of commit+consolidate), a lower value causes a lot of disk space to be wasted. For the case where the consolidation policies rarely merge segments (i.e. few inserts/deletes), a higher value impacts performance without any added benefits.

Background: With every “commit” or “consolidate” operation, a new state of the View' internal data structures is created on disk. Old states/snapshots are released once there are no longer any users remaining. However, the files for the released states/snapshots are left on disk, and only removed by “cleanup” operation.

Wait at least this many milliseconds between committing View data store changes and making documents visible to queries (default: 1000, to disable use: 0). For the case where there are a lot of inserts/updates, a higher value causes the index not to account for them and memory usage continues to grow until the commit. A lower value impacts performance, including the case where there are no or only a few inserts/updates because of synchronous locking, and it wastes disk space for each commit call.

Background: For data retrieval, ArangoSearch follows the concept of “eventually-consistent”, i.e. eventually all the data in ArangoDB will be matched by corresponding query expressions. The concept of ArangoSearch “commit” operations is introduced to control the upper-bound on the time until document addition/removals are actually reflected by corresponding query expressions. Once a “commit” operation is complete, all documents added/removed prior to the start of the “commit” operation will be reflected by queries invoked in subsequent ArangoDB transactions, in-progress ArangoDB transactions will still continue to return a repeatable-read state.

Wait at least this many milliseconds between applying consolidationPolicy to consolidate the View data store and possibly release space on the filesystem (default: 10000, to disable use: 0). For the case where there are a lot of data modification operations, a higher value could potentially have the data store consume more space and file handles. For the case where there are a few data modification operations, a lower value impacts performance due to no segment candidates being available for consolidation.

Background: For data modification, ArangoSearch follows the concept of a “versioned data store”. Thus old versions of data may be removed once there are no longer any users of the old data. The frequency of the cleanup and compaction operations are governed by consolidationIntervalMsec and the candidates for compaction are selected via consolidationPolicy.

The consolidation policy to apply for selecting which segments should be merged (default: {})

Background: With each ArangoDB transaction that inserts documents, one or more ArangoSearch-internal segments get created. Similarly, for removed documents, the segments that contain such documents have these documents marked as ‘deleted’. Over time, this approach causes a lot of small and sparse segments to be created. A “consolidation” operation selects one or more segments and copies all of their valid documents into a single new segment, thereby allowing the search algorithm to perform more optimally and for extra file handles to be released once old segments are no longer used.

Sub-properties:

• type (string, optional): The segment candidates for the “consolidation” operation are selected based upon several possible configurable formulas as defined by their types. The currently supported types are:
  • "tier" (default): consolidate based on segment byte size and live document count as dictated by the customization attributes. If this type is used, then below segments* and minScore properties are available.
  • "bytes_accum": consolidate if and only if {threshold} > (segment_bytes + sum_of_merge_candidate_segment_bytes) / all_segment_bytes i.e. the sum of all candidate segment byte size is less than the total segment byte size multiplied by the {threshold}. If this type is used, then below threshold property is available.
• threshold (number, optional): value in the range [0.0, 1.0]
• segmentsBytesFloor (number, optional): Defines the value (in bytes) to treat all smaller segments as equal for consolidation selection (default: 2097152)
• segmentsBytesMax (number, optional): Maximum allowed size of all consolidated segments in bytes (default: 5368709120)
• segmentsMax (number, optional): The maximum number of segments that are evaluated as candidates for consolidation (default: 10)
• segmentsMin (number, optional): The minimum number of segments that evaluated as candidates for consolidation (default: 1)
• minScore (number, optional): (default: 0)

Expects an object with the attribute keys being names of to be linked collections, and the link properties as attribute values. See arangosearch View Link Properties for details.

The name of the View.

Wait at least this many commits between removing unused files in the ArangoSearch data directory (default: 2, to disable use: 0). For the case where the consolidation policies merge segments often (i.e. a lot of commit+consolidate), a lower value causes a lot of disk space to be wasted. For the case where the consolidation policies rarely merge segments (i.e. few inserts/deletes), a higher value impacts performance without any added benefits.

Background: With every “commit” or “consolidate” operation, a new state of the View’s internal data structures is created on disk. Old states/snapshots are released once there are no longer any users remaining. However, the files for the released states/snapshots are left on disk, and only removed by “cleanup” operation.

Wait at least this many milliseconds between committing View data store changes and making documents visible to queries (default: 1000, to disable use: 0). For the case where there are a lot of inserts/updates, a higher value causes the index not to account for them and memory usage continues to grow until the commit. A lower value impacts performance, including the case where there are no or only a few inserts/updates because of synchronous locking, and it wastes disk space for each commit call.

Background: For data retrieval, ArangoSearch follows the concept of “eventually-consistent”, i.e. eventually all the data in ArangoDB will be matched by corresponding query expressions. The concept of ArangoSearch “commit” operations is introduced to control the upper-bound on the time until document addition/removals are actually reflected by corresponding query expressions. Once a “commit” operation is complete, all documents added/removed prior to the start of the “commit” operation will be reflected by queries invoked in subsequent ArangoDB transactions, in-progress ArangoDB transactions will still continue to return a repeatable-read state.

Wait at least this many milliseconds between applying consolidationPolicy to consolidate the View data store and possibly release space on the filesystem (default: 10000, to disable use: 0). For the case where there are a lot of data modification operations, a higher value could potentially have the data store consume more space and file handles. For the case where there are a few data modification operations, a lower value impacts performance due to no segment candidates being available for consolidation.

Background: For data modification, ArangoSearch follows the concept of a “versioned data store”. Thus old versions of data may be removed once there are no longer any users of the old data. The frequency of the cleanup and compaction operations are governed by consolidationIntervalMsec and the candidates for compaction are selected via consolidationPolicy.

The consolidation policy to apply for selecting which segments should be merged (default: {})

Background: With each ArangoDB transaction that inserts documents, one or more ArangoSearch-internal segments get created. Similarly, for removed documents, the segments that contain such documents have these documents marked as ‘deleted’. Over time, this approach causes a lot of small and sparse segments to be created. A “consolidation” operation selects one or more segments and copies all of their valid documents into a single new segment, thereby allowing the search algorithm to perform more optimally and for extra file handles to be released once old segments are no longer used.

Sub-properties:

• type (string, optional): The segment candidates for the “consolidation” operation are selected based upon several possible configurable formulas as defined by their types. The currently supported types are:
  • "tier" (default): consolidate based on segment byte size and live document count as dictated by the customization attributes. If this type is used, then below segments* and minScore properties are available.
  • "bytes_accum": consolidate if and only if {threshold} > (segment_bytes + sum_of_merge_candidate_segment_bytes) / all_segment_bytes i.e. the sum of all candidate segment byte size is less than the total segment byte size multiplied by the {threshold}. If this type is used, then below threshold property is available.
• threshold (number, optional): value in the range [0.0, 1.0]
• segmentsBytesFloor (number, optional): Defines the value (in bytes) to treat all smaller segments as equal for consolidation selection (default: 2097152)
• segmentsBytesMax (number, optional): Maximum allowed size of all consolidated segments in bytes (default: 5368709120)
• segmentsMax (number, optional): The maximum number of segments that are evaluated as candidates for consolidation (default: 10)
• segmentsMin (number, optional): The minimum number of segments that are evaluated as candidates for consolidation (default: 1)
• minScore (number, optional): (default: 0)

Expects an object with the attribute keys being names of to be linked collections, and the link properties as attribute values. See arangosearch View Link Properties for details.

The name of the View to rename.

The name of the View to drop.