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Spotlight on Oracle 10.5 - Getting Started Guide

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IO Subsystem Panel

ASM

If installed, Oracle's Automatic Storage Management (ASM) system automatically stores and reorganizes data according to statistics collected from usage and user access patterns. The IO Subsystem panel displays this ASM metric:

Metric Description
Activity

Automatic Storage Management (ASM) is a storage management solution from Oracle Corporation that automatically reorganizes data based on statistics collected from usage and user access patterns over time.

The value of this component indicates the total I/O activity on the ASM instance.

ASM can support more than one database, and so the I/O per second metric reflects the total I/O for the ASM instance, which includes ASM activities such as internal re-organization and I/O operations for other databases configured to access ASM on the same node.

Data Files

The Data Files area of the panel displays the following metrics for the RAC database cluster.

Metric Description
Phys Reads

The rate of physical reads performed across ALL instances in the Oracle RAC cluster.

In an Oracle RAC cluster, blocks are shared between instances. When a user session needs a block, it will search for the block in the buffer of the local instance first; if the block is not found there, the user session then looks for it in the buffer cache of all other participating instances.

A physical read (where data is read from disk) is required only when the block is not found in the buffer cache of ANY of the instances.

Phys Writes The rate of physical writes performed across all instances in the Oracle RAC cluster.
Single Block Read Service Time The time taken to read a single block into memory from a datafile on each instance.
Files The total number of data files in the Oracle RAC cluster.
Tablespaces The total number of tablespaces in the Oracle RAC cluster.
Total The total size of tablespaces in the Oracle RAC cluster.

Redo Logs

The Redo Logs area of the panel displays the following metrics for the RAC database cluster.

Metric Description
Redo Writes The rate of redo writes performed to the Log Writer (LGWR) in an Oracle RAC cluster. This is the rate of total redo writes from all instances participating in the cluster.
Groups The average and maximum number of groups in the Redo logs for the Oracle RAC cluster.
Size The average and maximum size of Redo logs in the Oracle RAC cluster.

Archive Logs

The Archive Logs area of the panel displays the following metrics for the RAC database cluster.

Metric Description
Cylinder

This information is updated every 5 minutes.

This value shows the aggregate amount of free space available in the archive destinations defined for the Oracle database. There are usually at least two (and there can be as many as 10) archive destinations defined per Oracle instance. A destination failure occurs when the next archive destination is about to fail. A critical failure occurs when the number of working archive destinations falls below the minimum number needed to archive successfully.

Notes:

  • Spotlight bases its calculation of time to failure on the last three days of archived logs.
  • Spotlight calculates the time to failure via the V$ARCHIVED_LOG table, and returns no estimate until that table contains at least 7 logs.

For more information on archive log space for this Oracle RAC cluster, see the Archive Destinations | Free Space chart and Archive Destination grid.

Total Size The total amount of space on the archive destination whose failure will cause the archiving process to fail (critical failure)
Minimum Free

The amount of free space left on the archive destination whose failure will cause the archiving process to fail (critical failure).

Note (Oracle 10g and later): When ASM is used for archiving, a negative value for the Minimum Free metric indicates that the ASM diskgroup does not have enough space to cope with a disk failure.

Time to failure

The time at which the archiving process will fail if the relevant archive log destination(s) are not purged (critical failure ).

Note: Spotlight calculates the time to failure via the V$ARCHIVED_LOG table, and returns no estimate until that table contains at least 7 logs.

For more information on archive log space for the Oracle RAC cluster, see the Archive Destinations | Free Space chart and Archive Destination grid.

System Information

The System Information area below the IO Subsystem panel contains details of the Oracle version and operating system version.

The Uptime for the Oracle RAC cluster is that of the database instance with the longest uptime. This may underestimate the actual uptime of the cluster.

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