mirror of https://gitee.com/bigwinds/arangodb
38 lines
1.7 KiB
Markdown
38 lines
1.7 KiB
Markdown
Features and Improvements
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=========================
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The following list shows in detail which features have been added or improved in
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ArangoDB 3.4. ArangoDB 3.4 also contains several bugfixes that are not listed
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here.
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ArangoSearch
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------------
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[ArangoSearch](../Views/ArangoSearch.md)
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Streaming AQL Cursors
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------------------
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It is now possible to create AQL query cursors with the new *stream* option.
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Specify *true* and the query will be executed in a **streaming** fashion. The query result is
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not stored on the server, but calculated on the fly. *Beware*: long-running queries will
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need to hold the collection locks for as long as the query cursor exists.
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When set to *false* the query will be executed right away in its entirety.
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In that case query results are either returned right away (if the resultset is small enough),
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or stored on the arangod instance and accessible via the cursor API. It is advisable
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to *only* use this option on short-running queries *or* without exclusive locks (write locks on MMFiles).
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Please note that the query options `cache`, `count` and `fullCount` will not work on streaming
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queries. Additionally query statistics, warnings and profiling data will only be available
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after the query is finished.
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The default value is *false*
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Miscellaneous features
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----------------------
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- new optional collection property `cacheEnabled` which enables in-memory caching
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for documents and primary index entries. This can potentially speed up point-lookups
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significantly, especially if your collections has a subset of frequently accessed
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keys. Please test this feature carefully to ensure that it does not adversely
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affect the performance of your system. |