Oracle Enterprise Manager Performance Monitoring User's Guide

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Using Predefined Charts

Default Features of Predefined Charts
Overview of Predefined Charts

Oracle Performance Manager includes a wide variety of predefined charts to graphically depict database performance statistics of common interest. This section covers the following topics:

Default Features of Predefined Charts
Overview of Predefined Charts

Default Features of Predefined Charts

By default, Oracle Performance Manager presents information in predefined charts in the following ways:

Charts showing rates per unit of time are presented as line charts, in order to best show trends over time. The predefined chart File I/O Rate is an example.
Charts showing ratios are presented as pie charts, in order to best compare the relative measurement of one variable to another variable. The predefined chart Library Cache Hit % is an example.
Charts consisting primarily of text information are presented as tables, in order to best display that text. The predefined chart Tablespace is an example.
Charts displaying a large number of rows and columns are also presented as tables, in order to best summarize that large amount of data. The predefined chart Session is an example.
Other charts are presented as bar charts. The predefined chart No. of Users Logged On is an example.

However, regardless of the information content, you can change the presentation format of any chart to any chart type that Oracle Performance Manager provides. The easiest way is to click on a displayed chart using the right mouse button, select Type, and then select one of the chart type options. You can also change the chart type using the Chart Properties property sheet. For more information, see Customizing Display Elements of Charts on page 4-1.

The X and Y axes of Oracle Performance Manager charts automatically scale to fit the data being presented. However, you can change the scale of any chart if you so choose. For more information, see Customizing Display Elements of Charts on page 4-1.

You can change the dimension of any chart type (except a table) to be either 2D or 3D. The easiest way is to click on a displayed chart using the right mouse button, select Dimensions, and then select 2D or 3D. You can also change the dimension of a chart using the Chart Properties property sheet. For more information, see Customizing Display Elements of Charts on page 4-1.

You can display any predefined chart by selecting from the Monitor menu, or you can define a new chart window containing one or more predefined charts. For information on displaying or defining chart windows that contain predefined charts, see Displaying Charts in Chart Windows on page 6-1.

Overview of Predefined Charts

This section includes an alphabetical listing of the predefined Oracle Performance Manager charts. Each chart is described briefly. The V$ view(s) from which the chart statistics were derived is listed. When you can drill down for more detail, that information is also included.

For information about the statistics these charts display and the V$ views from which these statistics are derived, see the Oracle7 Server Reference. For information on how best to interpret these statistics, see Oracle7 Server Tuning.

Additional Information:

For information on charts for an Oracle Parallel Server, see the Oracle Parallel Server Support for the Oracle Enterprise Manager Console Guide.

Buffer Cache Hit %

The Buffer Cache Hit % chart displays information about the buffer cache hit percentage of the database instance.

This chart displays statistics from the following view:

V$SYSSTAT

Buffer Gets Rate

The Buffer Gets Rate chart displays information about the buffer gets rate of the database instance.

This chart displays statistics from the following view:

V$SYSSTAT

Circuit

The Circuit chart displays information about virtual circuits. A virtual circuit is a connection to a database instance through a dispatcher and the shared server currently processing the user's request.

The Circuit chart displays statistics from the following views:

V$CIRCUIT
V$DISPATCHER
V$SESSION
V$SHARED_SERVER

Data Dict Cache Hit %

The Data Dict Cache Hit % chart displays information about data dictionary cache hits of the database instance.

This chart displays statistics from the following view:

V$ROWCACHE

Dispatcher

The Dispatcher chart displays activity statistics for dispatcher processes of the database instance.

This chart displays statistics from the following view:

V$DISPATCHER

File I/O Rate

The File I/O Rate chart displays the number of physical reads and writes per second for all files of the database instance. Only information about Oracle files is shown in this chart. You can drill down from the File I/O Rate chart to display the File I/O Rate Details chart.

This chart displays statistics from the following view:

V$FILESTAT

File I/O Rate Details

The File I/O Rate Details chart displays the number of physical reads and writes per second for individual files of the database instance.

This chart displays statistics from the following views:

V$FILESTAT
V$DBFILE

Free List Hit %

The Free List Hit % chart displays data block contention statistics for the database instance.

This chart displays statistics from the following views:

V$WAITSTAT
V$SYSSTAT

Latch

The Latch chart displays latch activity statistics for processes of the database instance. Latches are low-level locks on shared internal structures.

This chart displays statistics from the following views:

V$LATCH
V$LATCHHOLDER
V$LATCHNAME

Library Cache Details

The Library Cache Details chart displays library cache performance statistics for the library cache. The library cache contains shared cursors and is part of the shared pool in the SGA of the database instance.

This chart displays statistics from the following view:

V$LIBRARYCACHE

Library Cache Hit %

The Library Cache Hit % chart displays the percentages of library cache hits and library cache misses for the database instance. You can drill down from the Library Cache Hit % chart to display the Library Cache Details chart.

This chart displays statistics from the following view:

V$LIBRARYCACHE

Lock

The Lock chart displays information about locks that are held and locks that are requested for the database instance.

This chart displays statistics from the following views:

V$LOCK
V$SESSION

Memory Allocated

The Memory Allocated chart displays the amount of memory (in bytes) allocated for current sessions in the database instance.

This chart displays statistics from the following views:

V$STATNAME
V$SESSTAT

Memory Sort Hit %

The Memory Sort Hit % chart displays the percentages of memory sort hits and memory sort misses for the database instance.

This chart displays statistics from the following view:

V$SYSSTAT

Network Bytes Rate

This chart displays statistics from the following view:

V$SYSSTAT

Network I/O Rate

The Network I/O Rate chart displays the number of message packets per second the database server and its clients exchange over SQL*Net.

This chart displays statistics from the following view:

V$SYSTEM_EVENT

No. of Users Active

The No. of Users Active chart displays the number of user sessions actively using the database instance at the current time.

This chart displays statistics from the following view:

V$SESSION

No. of Users Logged On

The No. of Users Logged On chart displays the number of concurrent user sessions logged on to the database instance, whether or not activity is being generated.

This chart displays statistics from the following view:

V$LICENSE

No. of Users Running

The No. of Users Running chart displays the number of concurrent user sessions logged on to the database instance and currently running a transaction.

This chart displays statistics from the following view:

V$SESSION_WAIT

No. of Users Waiting

The No. of Users Waiting chart displays the number of users currently logged on to the database instance, but waiting (for whatever reason) to perform a task.

This chart displays statistics from the following view:

V$SESSION_WAIT

No. of Users Waiting For Locks

The No. of Users Waiting For Locks chart displays the number of users currently logged on to the database instance, but waiting for the release of a lock.

This chart displays statistics from the following view:

V$SESSION

Overview

The default Overview chart window includes a group of charts that display key performance statistics to indicate the general health of the database instance. Specifically, the Overview chart window includes the following charts:

# Users Active
# Users Logged On
# Users Running
# Users Waiting for Locks
Buffer Cache Hit
Data Dict Cache Hit %
File I/O Rate
Library Cache Hit %
Memory Allocated
Memory Sort Hit %
Rollback Nowait Hit %
System I/O Rate
Throughput

Choose New Window from the Create menu to create a customized version of the Overview chart window, in order to include the charts most relevant to your particular environment. For more information, see Displaying Charts in Chart Windows on page 6-1.

Parse Ratio

The Parse Ratio chart displays the parse ratio for the database instance.

This chart displays statistics from the following views:

V$SYSSTAT

Process

The Process chart displays information about currently active background and user processes for the database instance.

When the username or terminal are unidentified in V$PROCESS, the information from V$SESSION is displayed if it exists. If the username is taken from V$SESSION, it is displayed in parentheses.

This chart displays statistics from the following views:

V$PROCESS
V$SESSION

Queue

The Queue chart displays activity statistics about queues used in the multi-threaded server.

This chart displays statistics from the following view:

V$QUEUE

Read Consistency Hit %

The Read Consistency Hit % chart displays the percentages of read consistency hits and read consistency misses for the database instance.

This chart displays statistics from the following view:

V$SYSSTAT

Redo Allocation Hit %

The Redo Allocation Hit % chart displays the percentages of redo allocation hits and redo allocation misses for the database instance.

This chart displays statistics from the following view:

V$LATCH

Redo Statistics Rate

The Redo Statistics Rate chart displays the number of entries, space requests, and synch writes per second for the database instance.

This chart displays statistics from the following view:

V$SYSSTAT

Rollback Nowait Hit %

The Rollback Nowait Hit % chart displays the percentages of hits and misses for online rollback segments of the database instance.

This chart displays statistics from the following views:

V$ROLLNAME
V$ROLLSTAT

Session

The Session chart displays information about user sessions logged onto the database instance.

This chart displays statistics from the following views:

V$PROCESS
V$SESSION

Shared Server

The Shared Server chart displays queuing activity statistics for shared server processes of the database instance.

This chart displays statistics from the following view:

V$SHARED_SERVER

Sort Rows Rate

The Sort Rows Rate chart displays information about the sort rows rate for the entire database instance.

This chart displays statistics from the following view:

V$SYSSTAT

SQL Area

The SQL Area chart displays information about shared cursors in the library cache. Each shared cursor contains information used to execute its SQL statement or PL/SQL block.

This chart displays statistics from the following view:

V$SQLAREA

System I/O Rate

The System I/O Rate chart displays I/O statistics for the database instance, including buffer gets, block changes, and physical reads per second.

This chart displays statistics from the following view:

V$SYSSTAT

System Stats

The System Stats chart displays 121 statistics for the database instance. This chart is appears in table format by default to aid in locating statistics of interest.

This chart displays statistics from the following view:

V$SYSSTAT

Table Access

The Table Access chart displays information about database objects being accessed and the sessions accessing them in the database instance.

This chart displays statistics from the following view:

V$ACCESS

Table Scan Rows Rate

The Table Scan Rows Rate chart displays the number of table scan rows per second for the database instance.

This chart displays statistics from the following view:

V$SYSSTAT

Tablespace

The Tablespace chart displays statistics for tablespaces in the database instance, including status, total number of file blocks, and total quota blocks.

This chart displays statistics from the following tables:

DBA_DATA_FILES
DBA_TABLESPACES
DBA_TS_QUOTAS

Tablespace Free Space

The Tablespace Free Space chart displays the number of free file blocks and number of free quota blocks in each tablespace of the database instance.

This chart displays statistics from the following table:

DBA_FREE_SPACE

Throughput Rate

The Throughput Rate chart displays the number of user calls and transactions per second for the database instance.

This chart displays statistics from the following view:

V$SYSSTAT

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