Pro SQL Server Wait Statistics

APPENDIX III

Latch Classes

Latch class	Books Online Description	Additional Information
ALLOC_CREATE_RINGBUF	Used internally by SQL Server to initialize the synchronization of the creation of an allocation ring buffer.	Used when creating a ring buffer. A ring buffer briefly holds internal event information in memory and is used for diagnostics.
ALLOC_CREATE_FREESPACE_CACHE	Used to initialize the synchronization of internal freespace caches for heaps.	Allocates free space for heaps (tables without a clustered index)
ALLOC_CACHE_MANAGER	Used to synchronize internal coherency tests.
ALLOC_FREESPACE_CACHE	Used to synchronize access to a cache of ...