Oracle 下基于 DBMS_RESOURCE_MANAGER 包估算数据库存储 IO 性能

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Oracle 下基于 DBMS_RESOURCE_MANAGER 包估算数据库存储 IO 性能

1.CALIBRATE_IO 

使用 CALIBRATE_IO 存储过程估算数据库存储 IO 性能。该存储过程的输入输出如下。

参数名称	参数类型	参数描述
num_physical_disks	IN	Approximate number of physical disks in the database storage
max_latency	IN	Maximum tolerable latency in milliseconds for database-block-sized IO requests
max_iops	OUT	Maximum number of I/O requests per second that can be sustained. The I/O requests
max_mbps	OUT	Maximum throughput of I/O that can be sustained, expressed in megabytes per second. The I/O requests are randomly-distributed, 1 megabyte reads.
actual_latency	OUT	Average latency of database-block-sized I/O requests at max_ iops rate, expressed in milliseconds

测试语句类似如下。

SQL> set time on

set timing on

SET SERVEROUTPUT ON 

DECLARE 

  lat  INTEGER; 

  iops INTEGER; 

  mbps INTEGER; 

BEGIN 

   DBMS_RESOURCE_MANAGER.CALIBRATE_IO (120, 10, iops, mbps, lat); 

   DBMS_OUTPUT.PUT_LINE ('max_iops = ' || iops); 

   DBMS_OUTPUT.PUT_LINE ('latency  = ' || lat); 

   dbms_output.put_line('max_mbps = ' || mbps); 

end; 

/

注意：num_physical_disks 参数可设置较大，如果设置过小，将影响测试结果。当该值超过一定的限度后，估算的 IO 性能值将不再变化。

注意：同一时刻仅能执行一次估算（Only one calibration can be run at a time. If another calibration is initiated at the same time, it will fail.）

注意：对于 Oracle RAC 而言，负载将被均衡至各个节点（For an Oracle Real Application Clusters (Oracle RAC) database, the workload is simultaneously generated from all instances.）

 

参考文档：

《PLSQL Packages and Types Reference》