Oracle 视图 V$OSSTAT 官方解释，作用，如何使用详细说明
本站中文解释
Oracle视图V$OSSTAT提供了操作系统监视信息。通过V$OSSTAT，可以查看实例当前操作系统状态，推断实例当前等待的活动、性能、实例服务器系统能力和活动数据量等情况。可以通过此视图跟踪操作系统性能参数，如负载、CPU 使用百分比、系统I/O、网络I/O、内存使用等。
使用方法:
1. 查询操作系统特定性能指标的信息：
SELECT * from V$OSSTAT where statistic# = (select statistic# from V$STATNAME where name = ‘特定性能指标的名字’);
2. 查询操作系统的综合性能：
SELECT b.name, a.value
FROM V$OSSTAT a, V$STATNAME b
WHERE a.statistic# = b.statistic#
ORDER BY b.name;
官方英文解释
V$OSSTAT displays system utilization statistics from the operating system. One row is returned for each system statistic.
| Column | Datatype | Description |
|---|---|---|
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Name of the statistic (see Table 9-3) |
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Instantaneous statistic value |
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Statistic ID |
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Any additional operating system-specific clarifications for the statistic |
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Indicates whether the statistic is cumulative (that is, accumulates over time) ( |
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The ID of the container to which the data pertains. Possible values include:
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Table 9-3 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 |
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SYS_TIME |
Number of hundredths of a second that a processor has been busy executing kernel code, totalled over all processors |
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IOWAIT_TIME |
Number of hundredths of a second that a processor has been waiting for I/O to complete, totalled over all processors |
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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 |
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AVG_BUSY_TIME |
Number of hundredths of a second that a processor has been busy executing user or kernel code, averaged over all processors |
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AVG_USER_TIME |
Number of hundredths of a second that a processor has been busy executing user code, averaged over all processors |
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AVG_SYS_TIME |
Number of hundredths of a second that a processor has been busy executing kernel code, averaged over all processors |
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AVG_IOWAIT_TIME |
Number of hundredths of a second that a processor has been waiting for I/O to complete, averaged over all processors |
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AVG_NICE_TIME |
Number of hundredths of a second that a processor has been busy executing low-priority user code, averaged over all processors |
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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 |
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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 |
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VM_IN_BYTES |
Total number of bytes of data that have been paged in due to virtual memory paging |
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VM_OUT_BYTES |
Total number of bytes of data that have been paged out due to virtual memory paging |
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PHYSICAL_MEMORY_BYTES |
Total number of bytes of physical memory |
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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. |
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NUM_CPU_CORES |
Number of CPU cores available (includes subcores of multicore CPUs as well as single-core CPUs) |
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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) |
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NUM_VCPUS |
Number of virtual CPUs available |
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NUM_LCPUS |
Number of logical CPUs available (includes hardware threads if hardware threading is turned on) |
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TCP_SEND_SIZE_MIN |
Minimum size of the TCP send buffer |
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TCP_SEND_SIZE_DEFAULT |
Default size of the TCP send buffer |
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TCP_SEND_SIZE_MAX |
Maximum size of the TCP send buffer |
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TCP_RECEIVE_SIZE_MIN |
Minimum size of the TCP receive buffer |
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TCP_RECEIVE_SIZE_DEFAULT |
Default size of the TCP receive buffer |
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TCP_RECEIVE_SIZE_MAX |
Maximum size of the TCP receive buffer |
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GLOBAL_SEND_SIZE_MAX |
Maximum size of the global send buffer |
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GLOBAL_RECEIVE_SIZE_MAX |
Maximum size of the global receive buffer |
Note:
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.
