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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 bugfixes that are not listed here.
ArangoSearch
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 resultset 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
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.