Chapter 14 Overview
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## Chapter 14 Overview

The Overview Dashboard shows a high level summary of the MySQL instances and hosts that are monitored by MySQL Enterprise Monitor.

The Overview summarizes various key statistics related to the group that is selected, such Database Availability, Connections, Database Activity, Query Response Times, and any current MySQL Instances or Hosts that have active Critical or Emergency level events against them. It is designed in this way to give you a quick high level picture of assets that require immediate attention, as well as give you an up to date profile of how MySQL Instances within environment are behaving.

Figure 14.1 Overview Dashboard

## 14.1 Database Statistics

The Database Availability statistics show an aggregate of availability statistics, generated by the MySQL Availability Advisor, for all MySQL Instances within the selected Group, and allows you to monitor your Service Level Agreements for availability.

Note

The MySQL Availability Advisor must be enabled for this functionality to work. It is enabled by default.

Database Availability is computed by each MySQL Enterprise Monitor Agent attempting a connection to the monitored MySQL instances (by default every 1 second, but this is configurable within the Advisor), to check whether the MySQL Instance is actively accepting new connections.

To see a summary of the instance availability per period, hover the cursor over any of the availability bars to display the Availability pop-up. The availability is broken down in to four categories:

- Available: The percentage of time the monitored instances were actively monitored.

- Up: The instance `Uptime` reports the percentage of time the instance was running but was not monitored.

- Unreachable: The percentage of time a monitored MySQL Instance did not respond.

- Down: The Agent could not get a response from the MySQL Instance at all.

For each time range, the bar chart is split up in to slices of time (1 or 2 pixels each, depending on the width of the display), which represent a period of time; Day = 4 minutes, Week = 20 minutes and Month = 2 hours. Within those slices, the time within each availability state is aggregated across all MySQL Instances within the selected Group, and shown as the percentage of the total time in the slice.

For example, if you have four MySQL Instances within the selected group, with three of them being up and one of them being down for a 4 minute period within the day, the slice representing those 4 minutes would be 75% dark green, and 25% red.

Note

MySQL Availability reporting is only available when using a MySQL Enterprise Monitor Agent of version 3.0.0 and above.

## 14.2 Overview Graphs

The following graphs are displayed by default:

- Connections - All MySQL Instances

- Database Activity - All MySQL Instances (Always displayed.)

- Query Response Time Index

The graphs are customizable. To change a graph, do the following:

1. Select the title of the graph. The graph selection drop-down list is displayed.

2. Select the required graph from the drop-down list. The graph updates to your selection and is saved for future sessions.

To move the graphs, use the move icon in the top right corner of the graph.

It is also possible to add graphs to the Overview page. To add a graph, do the following:

1. Click the Add a new graph button. The graph selection drop-down list is displayed. If the graph is currently displayed on the Overview page, its entry is greyed out in the selection drop-down list.

2. Select a graph. The page reloads and the selected graph is displayed.

To remove a graph, click the red X in the top-right corner of the graph. The page reloads and the selected graph is removed.

## 14.3 General Database Statistics

The remaining Databases Statistics graphs are designed to show a high level picture of the concurrency (Connections - All MySQL Instances), throughput (Database Activity - All MySQL Instances) and response times (Query Response Time Index) of the MySQL Instances within the selected group. These allow you to quickly spot if the profile of activity within the environment has changed.

### Current Problem MySQL Instances and Hosts Panels

The Current Problem MySQL Instances and Current Problem MySQL Hosts list the top 5 MySQL Instances and Hosts respectively, based on whether they have open events with a current status of either Emergency or Critical.

The results are sorted by the total time that each event has had those statuses, by Emergency descending, and then Critical descending. This means that the MySQL Instances, or Hosts, that have had Emergency, then Critical events open for the longest are displayed at the top of the list.

### Current Emergency & Critical Events

The Current Emergency & Critical Events panel lists a stream of the currently open events with an Emergency or Critical status. These are listed separately to the Current Problem MySQL Instances or Current Problem Hosts panels, as these might not show all assets within an environment that is monitoring five or more of either asset type.

This enables you to see all current high priority events within a single panel for all monitored assets.

## 14.4 Group Overview Configuration

The Group Overview configuration bar enables you to select the group to view in the Overview dashboard. It also enables you to define the period for which the data is displayed.

By default, the Group Overview is set to All. To edit the overview, click Edit. The Group Overview edit bar is displayed.

Figure 14.2 Group Overview Filter Configuration

The controls in the Group Overview configuration bar are described in the following table:

Table 14.1 Group Overview Filter Configuration

Name | Description
--- | ---
Group Overview | Drop-down list containing all groups defined in MySQL Enterprise Service Manager.
Graph Time Range | Drop-down lists containing the time periods to apply to the graphs. The possible values are: Interval: select the duration for the overview data. If you select 1 hour, the data collected in the last hour is displayed. From/To: select a date and time range for the overview data. Graph time ranges apply to the timeseries graphs, only. They do not apply to the Availability, Problem, or Current Emergency information.
Go | Applies the new configuration to the Overview dashboard.
Save as Default | Sets the selected group and time range as the default. It is not possible to save a date range, using From/To, as the default for a group.
Reset to Default | Resets the group overview configuration to the previously saved values.

Important

If the default group is deleted, an error is displayed on the Overview dashboard.

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