V$PROCESS

V$PROCESS displays information about the currently active processes. While the LATCHWAIT column indicates what latch a process is waiting for, the LATCHSPIN column indicates what latch a process is spinning on. On multi-processor machines, Oracle processes will spin on a latch before waiting on it.

Column	Datatype	Description
`ADDR`	`RAW(4 \| 8)`	Address of the process state object
`PID`	`NUMBER`	Oracle process identifier
`SPID`	`VARCHAR2(24)`	Operating system process identifier
`USERNAME`	`VARCHAR2(15)`	Operating system process username Note: Any two-task user coming across the network has "-T" appended to the username.
`SERIAL#`	`NUMBER`	Process serial number
`TERMINAL`	`VARCHAR2(30)`	Operating system terminal identifier
`PROGRAM`	`VARCHAR2(48)`	Program in progress
`TRACEID`	`VARCHAR2(255)`	Trace file identifier
`TRACEFILE`	`VARCHAR2(513)`	Trace file name of the process
`BACKGROUND`	`VARCHAR2(1)`	`1` for a background process; NULL for a normal process
`LATCHWAIT`	`VARCHAR2(8)`	Address of the latch the process is waiting for; NULL if none
`LATCHSPIN`	`VARCHAR2(8)`	Address of the latch the process is spinning on; NULL if none
`PGA_USED_MEM`	`NUMBER`	PGA memory currently used by the process
`PGA_ALLOC_MEM`	`NUMBER`	PGA memory currently allocated by the process (including free PGA memory not yet released to the operating system by the server process)
`PGA_FREEABLE_MEM`	`NUMBER`	Allocated PGA memory which can be freed
`PGA_MAX_MEM`	`NUMBER`	Maximum PGA memory ever allocated by the process