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SQL Server XTP Garbage Collection object

Applies to: SQL Server

The SQL Server XTP Garbage Collection performance object contains counters related to the In-Memory OLTP engine's garbage collector.

This table describes the SQL Server XTP Garbage Collection counters.

Counter Description
Dusty corner scan retries/sec (GC-issued) The number of scan retries due to write conflicts during dusty corner sweeps issued by the garbage collector (on average), per second. This is a very low-level counter, not intended for customer use.
Main GC work items/sec The number of work items processed by the main GC thread.
Parallel GC work item/sec The number of times a parallel thread has executed a GC work item.
Rows processed/sec The number of rows processed by the garbage collector (on average), per second.
Rows processed/sec (first in bucket and removed) The number of rows processed by the garbage collector that were first in the corresponding hash bucket, and were able to be removed immediately (on average), per second.
Rows processed/sec (first in bucket) The number of rows processed by the garbage collector that were first in the corresponding hash bucket (on average), per second.
Rows processed/sec (marked for unlink) The number of rows processed by the garbage collector that were already marked for unlink (on average), per second.
Rows processed/sec (no sweep needed) The number of rows processed by the garbage collector that will not require a dusty corner sweep (on average), per second.
Sweep expired rows removed/sec The number of expired rows removed during dusty corner sweeps (on average), per second.
Sweep expired rows touched/sec The number of expired rows touched during dusty corner sweeps (on average), per second.
Sweep expiring rows touched/sec The number of expiring rows touched during dusty corner sweeps (on average), per second.
Sweep rows touched/sec The number of rows touched during dusty corner sweeps (on average), per second.
Sweep scans started/sec The number of dusty corner sweep scans started (on average), per second.

Example

You begin to explore the query performance counters in this object using this T-SQL query on the sys.dm_os_performance_counters dynamic management view:

SELECT * FROM sys.dm_os_performance_counters
WHERE object_name LIKE '%XTP Garbage Collection%';