socket_*
socket_*
The socket_* tables store statistical metrics about socket usage for a Greenplum Database instance. There are three system tables, all having the same columns:
Deprecated. These tables are not currently populated and will be removed in a future release.
There are three system tables, all having the same columns:
- socket_now is an external table whose data files are stored in $MASTER_DATA_DIRECTORY/gpperfmon/data.
- socket_tail is an external table whose data files are stored in $MASTER_DATA_DIRECTORY/gpperfmon/data. This is a transitional table for socket statistical metrics that has been cleared from socket_now but has not yet been committed to socket_history. It typically only contains a few minutes worth of data.
- socket_history is a regular table that stores historical socket 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. |
| total_sockets_used | int | Total sockets used in the system. |
| tcp_sockets_inuse | int | Number of TCP sockets in use. |
| tcp_sockets_orphan | int | Number of TCP sockets orphaned. |
| tcp_sockets_timewait | int | Number of TCP sockets in Time-Wait. |
| tcp_sockets_alloc | int | Number of TCP sockets allocated. |
| tcp_sockets_memusage_inbytes | int | Amount of memory consumed by TCP sockets. |
| udp_sockets_inuse | int | Number of UDP sockets in use. |
| udp_sockets_memusage_inbytes | int | Amount of memory consumed by UDP sockets. |
| raw_sockets_inuse | int | Number of RAW sockets in use. |
| frag_sockets_inuse | int | Number of FRAG sockets in use. |
| frag_sockets_memusage_inbytes | int | Amount of memory consumed by FRAG sockets. |