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How are statistics collected in Oracle Enterprise Manager?
Although Oracle Enterprise Manager, Statspack and BSTAT/ESTAT, and the V$views have different interfaces (GUI, command line, SQL), the majority of data they collect and report on is extracted from the V$views. Because the V$views are based on memory-resident data, when an instance is shut down, the data related to the instance is lost.
Which is the best tool to gather statistics for Oracle?
It is also important to gather operating system and network statistics. These can then be correlated with the Oracle performance data. If you are using Statspack, BSTAT/ESTAT, or your own tool, you should devise a mechanism for collecting operating system statistics. With Oracle Enterprise Manager, this capability is built-in.
What do you need to know about Oracle Enterprise Manager?
Oracle Enterprise Manager provides the management and monitoring capabilities with many different notification options. This chapter provides recommendations for using Enterprise Manager to monitor and maintain a highly available environment across all tiers of the application stack.
What is a metric in Oracle Enterprise Manager?
A metric is a data point sampled by a Management Agent and sent to the Oracle Management Repository. It could be the availability of a component through a simple heartbeat test or an evaluation of a specific performance measurement such as “disk busy” or percentage of processes waiting for a specific wait event.
How are Optimizer statistics collected in Oracle Database?
In Oracle Database, optimizer statistics collection is the gathering of optimizer statistics for database objects, including fixed objects. The database can collect optimizer statistics automatically. You can also collect them manually using the DBMS_STATS package.
Who is the super user in Oracle Enterprise Manager?
When you log in to the Oracle Enterprise Manager using the SYSor SYSTEMuser account, you are logging in as the Oracle Enterprise Manager super user. These are the only accounts that are automatically granted the roles and privileges required to access all the management functionality provided the Database Control.
Can You disable automatic statistics collection in Oracle?
Oracle strongly recommends that you not disable automatic statistics gathering because it is critical for the optimizer to generate optimal plans for queries against dictionary and user objects. If you disable automatic collection, ensure that you have a good manual statistics collection strategy for dictionary and user schemas.