Recent Changes

The following new features were implemented in OLAP for the v2.4 releases:

•	OLAP object and aggregate queries can now included update batches that have not been merged with the corresponding shard by adding the parameter &uncommitted=true.

•	An optimization was made in storing link values in OLAP databases, resulting in a reduction in disk space used.

•	The “find duplicates” REST command (GET /{application}/{table}/_duplicates) has been updated to be more resilient to shards that are updated (merged) while the command is executing.

•	A new ROUNDUP function can be used to round numeric field values up or down to a specific value before passing to a metric function.

•	A new “verify shard” REST command can be used to launch an asynchronous test to verify the integrity of a given shard. Results of the verification run can be found in the Doradus log.

•	A new “shard properties” command allows properties of a shard to be set without performing a merge.

•	A new auto-merge option schedules a background task to automatically check shards and merge any new data. Background merging is compatible with manual REST command merging.

•	Object queries can now use xlink fields in the fields (&f) parameter. Example: GET /Email/Message/_query/?q=*&f=InReplyTo.*

•	An Optimizing OLAP Applications section was added to describe techniques for improving OLAP updates and queries.

•	New quantified link path comparison functions have been added: EQUALS, CONTAINS, INTERSECTS, and DISJOINT.