User Mode Scheduler. The mechanism used by SQL Server to implement lightweight pooling.
Disk space within a Database or File Group that is allocated to a table or index, but currently does not have any information stored in it. It is free space that can be used only by the table or index to which it is allocated. See also glossary definitions of Free space and Extent .
An area of memory used by SQL Server to manage session-specific data.
A processor mode that is primarily used for executing application code. Unlike the Privileged (Kernel) Mode, processes running in the user mode do not interact directly with the operating system’s kernel, memory, or hardware. As a result, whereas a crash of a kernel mode process in most cases leads to the entire system’s crash, a crash of a user mode process usually only terminates the application that was run using this mode. See Privileged mode .
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