V$OSSTAT displays system utilization statistics from the operating system. One row is returned for each system statistic.
| Column | Datatype | Description |
| STAT_NAME | VARCHAR2(64) | Name of the statistic (see table below) |
| VALUE | NUMBER | Instantaneous statistic value |
| OSSTAT_ID | NUMBER | Statistic ID |
| COMMENTS | VARCHAR2(64) | Any additional OS-specific clarifications for the statistic |
| CUMULATIVE | VARCHAR2(3) | Indicates whether the statistic is cumulative (that is, accumulates over time) (YES) or not (NO) |
| Statistic Name | Description |
| NUM_CPUS | Number of CPUs or processors available |
| IDLE_TIME | Number of hundredths of a second that a processor has been idle, totalled over all processors |
| BUSY_TIME | Number of hundredths of a second that a processor has been busy executing user or kernel code, totalled over all processors |
| USER_TIME | Number of hundredths of a second that a processor has been busy executing user code, totalled over all processors |
| SYS_TIME | Number of hundredths of a second that a processor has been busy executing kernel code, totalled over all processors |
| IOWAIT_TIME | Number of hundredths of a second that a processor has been waiting for I/O to complete, totalled over all processors |
| NICE_TIME | Number of hundredths of a second that a processor has been busy executing low-priority user code, totalled over all processors |
| AVG_IDLE_TIME | Number of hundredths of a second that a processor has been idle, averaged over all processors |
| AVG_BUSY_TIME | Number of hundredths of a second that a processor has been busy executing user or kernel code, averaged over all processors |
| AVG_USER_TIME | Number of hundredths of a second that a processor has been busy executing user code, averaged over all processors |
| AVG_SYS_TIME | Number of hundredths of a second that a processor has been busy executing kernel code, averaged over all processors |
| AVG_IOWAIT_TIME | Number of hundredths of a second that a processor has been waiting for I/O to complete, averaged over all processors |
| AVG_NICE_TIME | Number of hundredths of a second that a processor has been busy executing low-priority user code, averaged over all processors |
| OS_CPU_WAIT_TIME | Total number of hundredths of a second that processes have been in a ready state, waiting to be selected by the operating system scheduler to run |
| RSRC_MGR_CPU_WAIT_TIME | Total number of hundredths of a second that Oracle processes have been in a ready state, waiting for CPU to be available for their consumer group in the currently active resource plan |
| VM_PAGE_IN_BYTES | Total number of bytes of data that have been paged in due to virtual memory paging |
| VM_PAGE_OUT_BYTES | Total number of bytes of data that have been paged out due to virtual memory paging |
| PHYSICAL_MEMORY_BYTES | Total number of bytes of physical memory |
| LOAD | Current number of processes that are either running or in the ready state, waiting to be selected by the operating-system scheduler to run. On many platforms, this statistic reflects the average load over the past minute. |
| NUM_CPU_CORES | Number of CPU cores available (includes subcores of multicore CPUs as well as single-core CPUs) |
| NUM_CPU_SOCKETS | Number of CPU sockets available (represents an absolute count of CPU chips on the system, regardless of multithreading or multi-core architectures) |
| TCP_SEND_SIZE_MIN | Minimum size of the TCP send buffer |
| TCP_SEND_SIZE_DEFAULT | Default size of the TCP send buffer |
| TCP_SEND_SIZE_MAX | Maximum size of the TCP send buffer |
| TCP_RECEIVE_SIZE_MIN | Minimum size of the TCP receive buffer |
| TCP_RECEIVE_SIZE_DEFAULT | Default size of the TCP receive buffer |
| TCP_RECEIVE_SIZE_MAX | Maximum size of the TCP receive buffer |
| GLOBAL_SEND_SIZE_MAX | Maximum size of the global send buffer |
| GLOBAL_RECEIVE_SIZE_MAX | Maximum size of the global receive buffer |
Note:
1. The availability of all statistics except for NUM_CPUS and RSRC_MGR_CPU_WAIT_TIME is subject to the operating system platform on which the Oracle Database is running.
2. select * from V$OSSTAT;
| STAT_NAME | VALUE | OSSTAT_ID |
| NUM_CPUS | 4 | 0 |
| IDLE_TIME | 14036520 | 1 |
| BUSY_TIME | 9937639 | 2 |
| USER_TIME | 7886436 | 3 |
| SYS_TIME | 2051203 | 4 |
| IOWAIT_TIME | 0 | 5 |
| AVG_IDLE_TIME | 3507618 | 7 |
| AVG_BUSY_TIME | 2482915 | 8 |
| AVG_USER_TIME | 1970078 | 9 |
| AVG_SYS_TIME | 511292 | 10 |
| AVG_IOWAIT_TIME | 0 | 11 |
| OS_CPU_WAIT_TIME | 999400 | 13 |
| RSRC_MGR_CPU_WAIT_TIME | 0 | 14 |
| LOAD | 0.96875 | 15 |
| PHYSICAL_MEMORY_BYTES | 34240520192 | 1008 |
| VM_IN_BYTES | 3093569536 | 1009 |
| VM_OUT_BYTES | 0 | 1010 |
