Oracle教程 2023-02-26

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

本站中文解释

Oracle视图DBA_HIST_DATABASE_INSTANCE用于查看指定实例时期的数据库实例的性能信息。视图中的字段给出的信息可用于比较数据库实例的系统状况，便于分析系统瓶颈和确定性能优化策略。

使用DBA_HIST_DATABASE_INSTANCE，首先需要在控制台下启用AWR(Automatic Workload Repository)，然后收集实例的信息，当任务完成后，即可使用该视图来查看收集的数据，以及系统的性能监控历史数据。

例如，可以使用下面的SQL语句来查询某个时期内的实例性能指标：
SELECT Instance_Number, Snap_Id, Begin_Interval_Time, SGA_Size, Begin_Disk_Reads, End_Disk_Reads, Begin_Disk_Writes, End_Disk_Writes
FROM DBA_HIST_DATABASE_INSTANCE
WHERE Begin_Interval_Time between and ;

以上SQL语句，可以用来查看某个时间段内实例的开始和结束指标，比如SGA大小、磁盘读/写IO数等信息。

官方英文解释

DBA_HIST_DATABASE_INSTANCE displays the databases and instances in the Workload Repository.

Column	Datatype	NULL	Description
`DBID`	`NUMBER`	`NOT NULL`	Database ID
`INSTANCE_NUMBER`	`NUMBER`	`NOT NULL`	Instance number
`STARTUP_TIME`	`TIMESTAMP(3)`	`NOT NULL`	Startup time of the instance
`PARALLEL`	`VARCHAR2(3)`	`NOT NULL`	Indicates whether the instance is running in an Oracle Real Application Clusters (Oracle RAC) environment (`YES`) or not (`NO`)
`VERSION`	`VARCHAR2(17)`	`NOT NULL`	Database version
`DB_NAME`	`VARCHAR2(9)`		Name of the database
`INSTANCE_NAME`	`VARCHAR2(16)`		Name of the instance
`HOST_NAME`	`VARCHAR2(64)`		Name of the host
`LAST_ASH_SAMPLE_ID`	`NUMBER`	`NOT NULL`	Last sample ID for the active session history
`PLATFORM_NAME`	`VARCHAR2(101)`		Platform on which the instance is running
`CDB`	`VARCHAR2(3)`		Possible values are: `YES` if the database is a CDB `NO` if the database is not a CDB
`EDITION`	`VARCHAR2(7)`		The edition of the database. Possible values include: `CORE EE`: CORE Enterprise Edition `EE`: Enterprise Edition `PO`: Personal Edition `XE`: Express Edition
`DB_UNIQUE_NAME`	`VARCHAR2(30)`		Unique database name
`DATABASE_ROLE`	`VARCHAR2(16)`		Current role of the database: `SNAPSHOT STANDBY` `LOGICAL STANDBY` `PHYSICAL STANDBY` `PRIMARY` `FAR SYNC`
`CDB_ROOT_DBID`	`NUMBER`		The database ID of the CDB root for the sampled session
`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
`STARTUP_TIME_TZ`	`TIMESTAMP(3) WITH TIME ZONE`		Startup time of the instance

本站中文解释

官方英文解释

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