2.3 KiB
Features and Improvements
The following list shows in detail which features have been added or improved in ArangoDB 3.4. ArangoDB 3.4 also contains several bug fixes that are not listed here.
ArangoSearch
ArangoSearch is a sophisticated, integrated full-text search solution over a user-defined set of attributes and collections. It is the first type of view in ArangoDB.
Streaming AQL Cursors
It is now possible to create AQL query cursors with the new stream option.
Specify true and the query will be executed in a streaming fashion. The query result is
not stored on the server, but calculated on the fly. Beware: long-running queries will
need to hold the collection locks for as long as the query cursor exists.
When set to false the query will be executed right away in its entirety.
In that case query results are either returned right away (if the result set is small enough),
or stored on the arangod instance and accessible via the cursor API. It is advisable
to only use this option on short-running queries or without exclusive locks (write locks on MMFiles).
Please note that the query options cache, count and fullCount will not work on streaming
queries. Additionally query statistics, warnings and profiling data will only be available
after the query is finished.
The default value is false
Single document operations
When you now have AQL queries that INSERT, UPDATE, REMOVE, REPLACE or fetch a single document
in a cluster by e.g. using FILTER _key == '123', the coordinator node will now directly
carry out the change on the DBServer instead of instanciating respective AQL-snippets
on the DBServer. This reduces the amount of cluster roundtrips and thus improves the performance.
Miscellaneous features
- new optional collection property
cacheEnabledwhich enables in-memory caching for documents and primary index entries. This can potentially speed up point-lookups significantly, especially if your collections has a subset of frequently accessed keys. Please test this feature carefully to ensure that it does not adversely affect the performance of your system.