V$SESS_TIME_MODEL解釋

V$SESS_TIME_MODEL

        V$SESS_TIME_MODEL顯示會話各種操做的累加時間。該報告展現總的時間消耗和CPU時間(微秒)。任何定時操做緩存在Buffer中至多5秒的數據時間，這意味着一個定時操做消耗了較長的運行時間（如SQL執行），那麼存在在該視圖的數據至多會丟失5秒的操做累加時間。

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Column	Datatype	Description
SID	NUMBER	Session ID (same as in V$SESSION)
STAT_ID	NUMBER	Statistic identifier for the time statistic
STAT_NAME	VARCHAR2(64)	Name of the statistic (see Table 9-1)
VALUE	NUMBER	Amount of time (in microseconds) that the session has spent in this operation
CON_ID	NUMBER	The ID of the container to which the data pertains. 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

 

Table 9-1 V$SESS_TIME_MODEL and V$SYS_TIME_MODEL Statistics

Statistic Name	Description
DB Time	Amount of elapsed time (in microseconds) spent performing Database user-level calls. This does not include the elapsed time spent on instance background processes such as PMON.
DB CPU	Amount of CPU time (in microseconds) spent on database user-level calls. This does not include the CPU time spent on instance background processes such as PMON.
background elapsed time	Amount of elapsed time (in microseconds) consumed by database background processes.
background CPU time	Amount of CPU time (in microseconds) consumed by database background processes.
sequence load elapsed time	Amount of elapsed time spent getting the next sequence number from the data dictionary. If a sequence is cached, then this is the amount of time spent replenishing the cache when it runs out. No time is charged when a sequence number is found in the cache. For non-cached sequences, some time will be charged for every nextval call.
parse time elapsed	Amount of elapsed time spent parsing SQL statements. It includes both soft and hard parse time.
hard parse elapsed time	Amount of elapsed time spent hard parsing SQL statements.
SQL execute elapsed time	Amount of elapsed time SQL statements are executing. Note that for select statements this also includes the amount of time spent performing fetches of query results.
connection management call elapsed time	Amount of elapsed time spent performing session connect and disconnect calls.
failed parse elapsed time	Amount of time spent performing SQL parses which ultimately fail with some parse error.
failed parse (out of shared memory) elapsed time	Amount of time spent performing SQL parses which ultimately fail with error ORA-04031.
hard parse (sharing criteria) elapsed time	Amount of elapsed time spent performing SQL hard parses when the hard parse resulted from not being able to share an existing cursor in the SQL cache.
hard parse (bind mismatch) elapsed time	Amount of elapsed time spent performing SQL hard parses when the hard parse resulted from bind type or bind size mismatch with an existing cursor in the SQL cache.
PL/SQL execution elapsed time	Amount of elapsed time spent running the PL/SQL interpreter. This does not include time spent recursively executing/parsing SQL statements or time spent recursively executing the Java VM.
PL/SQL compilation elapsed time	Amount of elapsed time spent running the PL/SQL compiler.
inbound PL/SQL rpc elapsed time	Time inbound PL/SQL remote procedure calls have spent executing. It includes all time spent recursively executing SQL and JAVA, and therefore is not easily related to "PL/SQL execution elapsed time".
Java execution elapsed time	Amount of elapsed time spent running the Java VM. This does not include time spent recursively executing/parsing SQL statements or time spent recursively executing PL/SQL.
RMAN cpu time (backup/restore)	Amount of CPU time (in microseconds) spent in RMAN backup and restore operations.
repeated bind elapsed time	Amount of elapsed time spent giving new values to bind variables (rebinding).
OLAP engine elapsed time	Amount of time spent performing OLAP session transactions. This includes time spent on database user-level calls, SQL statement execution, and PL/SQL execution within the OLAP transaction.
OLAP engine CPU time	Amount of CPU time spent on OLAP session transactions. This includes time spent on database user-level calls, SQL statement execution, and PL/SQL execution within the OLAP transaction.

這些關聯的狀態列表能夠經過兩個子節點包含在父節點中樹形結構來表述，前面的數值表示節點。

1) background elapsed time
    2) background cpu time
          3) RMAN cpu time (backup/restore)
1) DB time
    2) DB CPU
    2) connection management call elapsed time
    2) sequence load elapsed time
    2) sql execute elapsed time
    2) parse time elapsed
          3) hard parse elapsed time
                4) hard parse (sharing criteria) elapsed time
                    5) hard parse (bind mismatch) elapsed time
          3) failed parse elapsed time
                4) failed parse (out of shared memory) elapsed time
    2) PL/SQL execution elapsed time
    2) inbound PL/SQL rpc elapsed time
    2) PL/SQL compilation elapsed time
    2) Java execution elapsed time
    2) repeated bind elapsed time

http://docs.oracle.com/database/121/REFRN/GUID-B5CF4362-325D-4F22-9A08-0873FA32A5C0.htm