Monday, February 9, 2009

V$OSSTAT

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)

V$OSSTAT Statistics

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

Oracle data dictionary views

Oracle dynamic performance views

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