udp_*
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udp_*
The udp_* tables store statistical metrics about UDP communications for a Greenplum Database instance.
Note: Deprecated. The udp_* tables are deprecated and will be removed in a
future release.
There are three system tables, all having the same columns:
- udp_now is an external table whose data files are stored in $MASTER_DATA_DIRECTORY/gpperfmon/data.
- udp_tail is an external table whose data files are stored in $MASTER_DATA_DIRECTORY/gpperfmon/data. This is a transitional table for UDP statistical data that has been cleared from udp_now but has not yet been committed to udp_history. It typically only contains a few minutes worth of data.
- udp_history is a regular table that stores historical UDP statistical metrics. It is pre-partitioned into monthly partitions. Partitions are automatically added in two month increments as needed. Administrators must drop old partitions for the months that are no longer needed.
| Column | Type | Description |
|---|---|---|
| ctime | timestamp(0) with no time zone | Time this record was created. |
| hostname | varchar(64) | The hostname associated with this measurement. |
| packets_received | bigint | Number of UDP packets received. |
| packets_sent | bigint | Number of UDP packets sent. |
| packets_received_unknown_port | int | Number of UDP packets received on unknown ports. |
| packet_receive_errors | bigint | Number of errors encountered during UDP packet receive. |