Query Processing Events Category

The Query Processing event category has the event classes described in the following table.

Event Class	Event Id	Description
Query Subcube	11	Query subcube, for Usage Based Optimization.
Query Subcube Verbose	12	Query subcube with detailed information. This event may have a negative impact on performance when turned on.
Get Data From Aggregation	60	Answer query by getting data from aggregation. This event may have a negative impact on performance when turned on.
Get Data From Cache	61	Answer query by getting data from one of the caches. This event may have a negative impact on performance when turned on.
Query Cube Begin	70	Collects all Query Cube Begin events since the trace started.
Query Cube End	71	Collects all Query Cube End events since the trace started.
Calculate Non Empty Begin	72	Calculate non empty begin.
Calculate Non Empty Current	73	Calculate non empty current.
Calculate Non Empty End	74	Calculate non empty end.
Serialize Results Begin	75	Serialize results begin.
Serialize Results Current	76	Serialize results current.
Serialize Results End	77	Serialize results end.
Execute MDX Script Begin	78	Execute MDX script begin.
Execute MDX Script Current	79	Execute MDX script current.
Execute MDX Script End	80	Execute MDX script end.
Query Dimension	81	Query dimension.
VertiPaq SE Query Begin	82	Vertipaq storage engine query start time.
VertiPaq SE Query End	83	Vertipaq storage engine query end time.

For information about the columns associated with each of the Query Processing event classes, see Query Processing Events Data Columns.