SQL Server distinguishes between 3 different types of latches: 1  IO Latches. 2  Buffer Latches (BUF) 3  Non-Buffer Latches (Non-BUF) Letâs have a more detailed look at these 3 different variations. I/O Latches are used by SQL Server when outstanding I/O operations against pages in the Buffer Pool are done â when you read and write from/to your storage subsystem.
The pharyngeal muscles are a group of muscles that act upon the pharynx. Pharyngeal muscles contracts pushing the food into the oesophagus.There are two muscular layers of the pharynx: the outer circular layer and the inner longitudinal layer.The outer circular layer includes: 1  Inferior constrictor muscle.2  Middle constrictor muscle.haryngeal muscles contracts pushing the food into the oesophagus. There are two muscular layers of the pharynx: the outer circular layer and the inner longitudinal layer. The outer circular layer includes: 1  Inferior constrictor muscle. 2  Middle constrictor muscle.
Setae. Setae are stiff hairs on each earthworm segment that extend and grip the surrounding soil as the worm's longitudinal muscles force fluid into the segment. As the segment contracts, the setae help push the worm forward, then retract until the next wave of expansion and contraction.arthworm movement begins with a contraction of the inner muscles nearest to the worm's head, setting off a ripple of contraction and expansion that propels the worm through the soil. Other People Are Reading.