Greenplum Database Cluster State
The Greenplum Command Center Dashboard provides a quick view of the current system status, Segment Health, Queries, CPU, Memory, and Disk usage. Clicking on a panel provides more detailed information about that metric. The Alerts panel shows the most recent messages from the Greenplum Database log file. Some information is available only to Command Center users with Admin or Operator permission level.
The following system information is displayed at the top of the page.
The Segment Health section of the Dashboard provides a quick overview of the status of the database system and segments this Command Center monitors.
Database State is the current state of the Greenplum Database system. The state can be one of the following:
- Normal: The database is functioning with no major errors or performance issues.
- Segment(s) Down: The database is in change-tracking mode or resync mode. Overall performance and system reliability is greatly reduced. See the Tanzu Greenplum Database System Administrator Guide for information about resolving this condition.
- Database Unreachable: The Greenplum Performance Monitor agent cannot connect to the database. The database is likely down. See the Tanzu Greenplum Database System Administrator Guide for troubleshooting information.
- Unbalanced: Some segments are not running in their preferred roles. That is, primaries are running as mirrors and mirrors are running as primaries, resulting in unbalanced processing.
- Resyncing: The database is performing a recovery or rebalance operation.
The bar graph in the Segment Status section shows the up or down status of all database segments in your Tanzu Greenplum Database system. A color indicator and associated number indicate the number of database segments that are currently in that particular state. Segments can have the following states:
- Up (Green)
- Down (Red)
Clicking the Segment Status panel displays the Segment Status Command Center page.
This chart displays total disk usage and disk available for the Greenplum master host and segment hosts at the last synchronization. Hover over the chart to see the amount of disk used, free, and total.
This graph displays a summary view of active and queued queries for the last 60 minutes. Click on the colored dot next to the Running or Queued label to toggle the line on or off. At least one line must be visible at all times. Hover over the graph to display the number of queries for each visible line at that point in time.
This graph displays average CPU usage across the entire cluster, for the last 60 minutes. The graph displays separate lines for system processes and user processes. The user CPU usage includes the Greenplum database master, standby, and segment processes. Click on the colored dot next to the System or User label to toggle that line on or off. At least one line must be visible at all times.
Hovering the cursor over a line in the graph displays a small window with the percentage of CPU used at that point in time for the visible lines and the total if both the system and user lines are visible.
This graph displays the average percent of memory used across the entire cluster over the last 60 minutes. Hover over the line to display the percent of memory used at that point in time.
Admin and Operator permission levels only
The Alerts panel displays recent messages from the Greenplum Database
pg_log log file. The panel is updated at each synchronization. Filter the messages by severity level using the controls at the top right of the panel.