Oracle 视图 DBA_HIST_RSRC_PDB_METRIC 官方解释，作用，如何使用详细说明

SNAP_ID

NUMBER

NOT NULL

Unique snapshot ID

DBID

NUMBER

NOT NULL

Database ID for the snapshot

INSTANCE_NUMBER

NUMBER

NOT NULL

Instance number for the snapshot

BEGIN_TIME

TIMESTAMP(3)

NOT NULL

Begin time of the interval

END_TIME

TIMESTAMP(3)

NOT NULL

End time of the interval

INTSIZE_CSEC

NUMBER

NOT NULL

Interval size (in hundredths of a second)

SEQUENCE#

NUMBER

NOT NULL

A sequential counter that uniquely describes the V$RSRC_PLAN_HISTORY entry to which these consumer group statistics apply. When the instance is restarted, this value is reset to zero.

CPU_CONSUMED_TIME

NUMBER

NOT NULL

Cumulative amount of CPU time consumed by all sessions in the consumer group, in milliseconds

CPU_WAIT_TIME

NUMBER

NOT NULL

Cumulative amount of time that sessions waited for CPU because of resource management, in milliseconds. This does not include waits due to latch or enqueue contention, I/O waits, and so on. When CPU resources are not being actively managed, this value is set to zero.

AVG_RUNNING_SESSIONS

NUMBER

Average number of sessions in the consumer group that are currently running

AVG_WAITING_SESSIONS

NUMBER

Average number of sessions in the consumer group that are waiting for CPU due to resource management. When CPU resources are not being actively managed, this value is set to zero.

AVG_CPU_UTILIZATION

NUMBER

Average percentage CPU consumed by the consumer group

IOPS

NUMBER

I/O operations per second during the previous minute for this PDB

IOMBPS

NUMBER

I/O megabytes per second during the previous minute for this PDB

IOPS_THROTTLE_EXEMPT

NUMBER

Indicates how much of the I/O per second in the current PDB was exempted from throttling.

For example, if the value in the IOPS column is 20 I/Os and the value in the IOPS_THROTTLE_EXEMPT column is 5 I/Os, then 5 I/Os of the 20 I/Os in that second were exempted from throttling.

I/O throttling is defined by the MAX_IOPS database initialization parameter.

IOMBPS_THROTTLE_EXEMPT

NUMBER

Indicates how many megabytes of I/O executed per second in the current PDB were exempted from throttling.

For example, if the value in the IOMBPS column is 200 megabytes and the value in the IOMBPS_THROTTLE_EXEMPT column is 50 megabytes, then 50 megabytes of the 200 megabytes were exempt from throttling.

I/O megabytes per second throttling is defined by the MAX_MBPS database initialization parameter.

AVG_IO_THROTTLE

NUMBER

Average throttle time per I/O operation in milliseconds during the previous minute for this PDB

AVG_ACTIVE_PARALLEL_STMTS

NUMBER

The average number of parallel statements that were running during the 1-minute metric window

AVG_QUEUED_PARALLEL_STMTS

NUMBER

The average number of parallel statements that were queued during the 1-minute metric window

AVG_ACTIVE_PARALLEL_SERVERS

NUMBER

The average number of parallel servers that were actively running as part of a parallel statement during the 1-minute metric window

AVG_QUEUED_PARALLEL_SERVERS

NUMBER

The average number of parallel servers that were requested by queued parallel statements during the 1-minute metric window

SGA_BYTES

NUMBER

NOT NULL

The current SGA usage for this PDB in bytes

BUFFER_CACHE_BYTES

NUMBER

NOT NULL

The current usage of the buffer cache by this PDB in bytes

SHARED_POOL_BYTES

NUMBER

NOT NULL

The current usage of the shared pool by this PDB in bytes

PGA_BYTES

NUMBER

NOT NULL

The current PGA usage for this PDB in bytes

PLAN_ID

NUMBER

NOT NULL

Resource Manager plan identifier

CON_DBID

NUMBER

The database ID of the PDB for the sampled session

CON_ID

NUMBER

The ID of the container that CON_DBID identifies. Possible values include:

• 0: This value is used for rows containing data that pertain to the entire CDB. This value is also used for rows in non-CDBs.

• 1: This value is used for rows containing data that pertain to only the root

• n: Where n is the applicable container ID for the rows containing data