gpstate

Shows the status of a running LightDB-A Database system.

Synopsis

gpstate [-d <coordinator_data_directory>] [-B <parallel_processes>] 
          [-s | -b | -Q \| -e\] \[-m \| -c] [-p] [-i] [-f] [-v | -q] | -x 
          [-l <log_directory>]

gpstate -? | -h | --help

Description

The gpstate utility displays information about a running LightDB-A Database instance. There is additional information you may want to know about a LightDB-A Database system, since it is comprised of multiple PostgreSQL database instances (segments) spanning multiple machines. The gpstate utility provides additional status information for a LightDB-A Database system, such as:

Which segments are down.
Coordinator and segment configuration information (hosts, data directories, etc.).
The ports used by the system.
A mapping of primary segments to their corresponding mirror segments.

Options

-b (brief status) : Optional. Display a brief summary of the state of the LightDB-A Database system. This is the default option.

-B parallel_processes : The number of segments to check in parallel. If not specified, the utility will start up to 60 parallel processes depending on how many segment instances it needs to check.

-c (show primary to mirror mappings) : Optional. Display mapping of primary segments to their corresponding mirror segments.

-d coordinator_data_directory : Optional. The coordinator data directory. If not specified, the value set for $COORDINATOR_DATA_DIRECTORY will be used.

-e (show segments with mirror status issues) : Show details on primary/mirror segment pairs that have potential issues. These issues include:

-   Whether any segments are down.
-   Whether any primary-mirror segment pairs are out of sync – including information on how many bytes are remaining to sync \(as displayed in the `WAL sync remaining bytes` output field\).

    > **Note** `gpstate -e`does not display segment pairs that are in sync.

-   Whether any primary-mirror segment pairs are not in their preferred roles.

-f (show standby coordinator details) : Display details of the standby coordinator host if configured.

-i (show LightDB-A Database version) : Display the LightDB-A Database software version information for each instance.

-l logfile_directory : The directory to write the log file. Defaults to ~/ltaAdminLogs.

-m (list mirrors) : Optional. List the mirror segment instances in the system and their current role.

-p (show ports) : List the port numbers used throughout the LightDB-A Database system.

-q (no screen output) : Optional. Run in quiet mode. Except for warning messages, command output is not displayed on the screen. However, this information is still written to the log file.

-Q (quick status) : Optional. Checks segment status in the system catalog on the coordinator host. Does not poll the segments for status.

-s (detailed status) : Optional. Displays detailed status information about the LightDB-A Database system.

-v (verbose output) : Optional. Displays error messages and outputs detailed status and progress information.

-x (expand) : Optional. Displays detailed information about the progress and state of a LightDB-A system expansion.

-? | -h | –help (help) : Displays the online help.

Output Field Definitions

The following output fields are reported by gpstate -s for the coordinator:

Output Data	Description
Coordinator host	host name of the coordinator
Coordinator postgres process ID	PID of the coordinator database listener process
Coordinator data directory	file system location of the coordinator data directory
Coordinator port	port of the coordinator `postgres` database listener process
Coordinator current role	dispatch = regular operating mode utility = maintenance mode
LightDB-A array configuration type	Standard = one NIC per host Multi-Home = multiple NICs per host
LightDB-A initsystem version	version of LightDB-A Database when system was first initialized
LightDB-A current version	current version of LightDB-A Database
Postgres version	version of PostgreSQL that LightDB-A Database is based on
LightDB-A mirroring status	physical mirroring or none
Coordinator standby	host name of the standby coordinator
Standby coordinator state	status of the standby coordinator: active or passive

The following output fields are reported by gpstate -s for each primary segment:

Output Data	Description
Hostname	system-configured host name
Address	network address host name (NIC name)
Datadir	file system location of segment data directory
Port	port number of segment `postgres` database listener process
Current Role	current role of a segment: Mirror or Primary
Preferred Role	role at system initialization time: Mirror or Primary
Mirror Status	status of a primary/mirror segment pair: Synchronized = data is up to date on both Not in Sync = the mirror segment has not caught up to the primary segment
Current write location	Location where primary segment is writing new logs as they come in
Bytes remaining to send to mirror	Bytes remaining to be sent from primary to mirror
Active PID	active process ID of a segment
Coordinator reports status as	segment status as reported in the system catalog: Up or Down
Database status	status of LightDB-A Database to incoming requests: Up, Down, or Suspended. A Suspended state means database activity is temporarily paused while a segment transitions from one state to another.

The following output fields are reported by gpstate -s for each mirror segment:

Output Data	Description
Hostname	system-configured host name
Address	network address host name (NIC name)
Datadir	file system location of segment data directory
Port	port number of segment `postgres` database listener process
Current Role	current role of a segment: Mirror or Primary
Preferred Role	role at system initialization time: Mirror or Primary
Mirror Status	status of a primary/mirror segment pair: Synchronized = data is up to date on both Not in Sync = the mirror segment has not caught up to the primary segment
WAL Sent Location	Log location up to which the primary segment has sent log data to the mirror
WAL Flush Location	Log location up to which the mirror segment has flushed the log data to disk
WAL Replay Location	Log location up to which the mirror segment has replayed logs locally
Bytes received but remain to flush	Difference between flush log location and sent log location
Bytes received but remain to replay	Difference between replay log location and sent log location
Active PID	active process ID of a segment
Coordinator reports status as	segment status as reported in the system catalog: Up or Down
Database status	status of LightDB-A Database to incoming requests: Up, Down, or Suspended. A Suspended state means database activity is temporarily paused while a segment transitions from one state to another.

Note When there is no connection between a primary segment and its mirror, gpstate -s displays Unknown in the following fields:

Bytes remaining to send to mirror
WAL Sent Location
WAL Flush Location
WAL Replay Location
Bytes received but remain to flush
Bytes received but remain to replay

The following output fields are reported by gpstate -f for standby coordinator replication status:

Output Data	Description
Standby address	hostname of the standby coordinator
Standby data dir	file system location of the standby coordinator data directory
Standby port	port of the standby coordinator `postgres` database listener process
Standby PID	process ID of the standby coordinator
Standby status	status of the standby coordinator: Standby host passive
WAL Sender State	write-ahead log (WAL) streaming state: streaming, startup,backup, catchup
Sync state	WAL sender synchronization state: sync
Sent Location	WAL sender transaction log (xlog) record sent location
Flush Location	WAL receiver xlog record flush location
Replay Location	standby xlog record replay location

Examples

Show detailed status information of a LightDB-A Database system:

gpstate -s

Do a quick check for down segments in the coordinator host system catalog:

gpstate -Q

Show information about mirror segment instances:

gpstate -m

Show information about the standby coordinator configuration:

gpstate -f

Display the LightDB-A software version information: