Parameters Related to cm_agent

log_dir

Parameter description: Specifies the directory where cm_agent logs are stored. The value can be an absolute path, or relative to the CM Agent data directory.

Value range: a string Any modification of this parameter takes effect only after cm_agent is restarted. For details about how to modify this parameter, see Table 2.

Default value: "log", indicating that CM Agent logs are generated in the CM Agent data directory.

log_file_size

Parameter description: Specifies the size of a log file. If a log file exceeds the specified size, a new one is created to record log information.

Value range: an integer ranging from 0 to 2047. The unit is MB. For details about how to modify this parameter, see Table 2.

Default value: 16MB

log_min_messages

Parameter description: Specifies which message levels are written to the cm_agent log. Each level covers all the levels following it. The lower the level is, the fewer messages will be written into the log.

Value range: enumerated type. Valid values are debug5, debug1, log, warning, error, and fatal. For details about how to modify this parameter, see Table 2.

Default value: warning

incremental_build

Parameter description: Specifies whether a standby DN is incrementally built. If this parameter is enabled, a standby DN is incrementally built.

Value range: Boolean. The value can be on or off. For details about how to modify this parameter, see Table 2.

Default value: on

alarm_component

Parameter description: Specifies the location of the alarm component that processes alarms.

Value range: a string For details about how to modify this parameter, see Table 2.

• If --alarm-type in the gs_preinstall script is set to 5, no third-party component is connected and alarms are written into the system_alarm log. In this case, the value of alarm_component is /opt/huawei/snas/bin/snas_cm_cmd.
• If --alarm-type in the gs_preinstall script is set to 1, a third-party component is connected. In this case, the value of alarm_component is the absolute path of the executable program of the third-party component.

Default value: /opt/huawei/snas/bin/snas_cm_cmd

alarm_report_interval

Parameter description: Specifies the interval at which an alarm is reported. For details about how to modify this parameter, see Table 2.

Value range: a non-negative integer (unit: s)

Default value: 1

alarm_report_max_count

Parameter description: Specifies the maximum number of times an alarm is reported. For details about how to modify this parameter, see Table 2.

Value range: a non-negative integer

Default value: 1

agent_report_interval

Parameter description: Specifies the interval at which cm_agent reports the instance status.

Value range: an integer. The unit is s. For details about how to modify this parameter, see Table 2.

Default value: 1

agent_phony_dead_check_interval

Parameter description: Specifies the interval at which cm_agent checks whether the DN process is suspended.

Value range: an integer. The unit is s. For details about how to modify this parameter, see Table 2.

Default value: 10

agent_check_interval

Parameter description: Specifies the interval at which cm_agent queries for the status of instances, such as the DNs.

Value range: an integer. The unit is s. For details about how to modify this parameter, see Table 2.

Default value: 2

agent_heartbeat_timeout

Parameter description: Specifies the heartbeat timeout interval for CM Agent to connect to CM Server.

Value range: an integer ranging from 2 to 2³¹ – 1. The unit is second. For details about how to modify this parameter, see Table 2.

Default value: 8

agent_connect_timeout

Parameter description: Specifies the time to wait before the attempt of cm_agent to connect to cm_server times out.

Value range: an integer. The unit is s. For details about how to modify this parameter, see Table 2.

Default value: 1

agent_connect_retries

Parameter description: Specifies the number of times cm_agent tries to connect to the cm_server.

Value range: an integer. For details about how to modify this parameter, see Table 2.

Default value: 15

agent_kill_instance_timeout

Parameter description: Specifies the interval from the time when cm_agent fails to connect to the primary cm_server to the time when cm_agent kills all instances on the node.

Value range: an integer. For details about how to modify this parameter, see Table 2.

Default value: 0, indicating that the operation of killing all instances on the node is not initiated.

security_mode

Parameter description: Specifies whether DNs are started in secure mode. If this parameter is set to on, DNs are started in secure mode. Otherwise, DNs are started in non-secure mode.

Value range: Boolean. The value can be on or off. For details about how to modify this parameter, see Table 2.

Default value: off

upgrade_from

Parameter description: Specifies the internal version number of the database before an in-place upgrade. Do not modify the value of this parameter.

Value range: a non-negative integer For details about how to modify this parameter, see Table 2.

Default value: 0

process_cpu_affinity

Parameter description: Specifies whether to bind a primary DN process to a CPU core before starting the process. If this parameter is set to 0, core binding will not be performed. If it is set to another value, core binding will be performed, and the number of physical CPU cores is 2ⁿ. Restart the database and cm_agent for any modification of this parameter to take effect. Only ARM is supported. For details about how to modify this parameter, see Table 2.

Value range: an integer ranging from 0 to 2

Default value: 0

log_threshold_check_interval

Parameter description: Specifies the interval for compressing and clearing logs. Logs are compressed and cleared every 1800 seconds.

Value range: an integer ranging from 0 to 2147483647. The unit is s. For details about how to modify this parameter, see Table 2.

Default value: 1800

dilatation_shard_count_for_disk_capacity_alarm

Parameter description: Specifies the number of shards to be added in the scale-out scenario. This parameter is used to calculate the threshold for reporting a disk capacity alarm.

The parameter value must be the same as the actual number of shards to be added.

Value range: an integer ranging from 0 to 2³² – 1. If this parameter is set to 0, the disk scale-out alarm is not reported. If this parameter is set to a value greater than 0, the disk scale-out alarm is reported and the threshold is calculated based on the number of shards specified by this parameter. For details about how to modify this parameter, see Table 2.

Default value: 1

log_max_size

Parameter description: Specifies the maximum size of a log file.

Value range: an integer ranging from 0 to 2147483647. The unit is MB. For details about how to modify this parameter, see Table 2.

Default value: 10240

log_max_count

Parameter description: Specifies the maximum number of logs that can be stored on hard disks.

Value range: an integer ranging from 0 to 10000. For details about how to modify this parameter, see Table 2.

Default value: 10000

log_saved_days

Parameter description: Specifies the number of days for storing logs.

Value range: an integer ranging from 0 to 1000. The unit is day. For details about how to modify this parameter, see Table 2.

Default value: 90

enable_log_compress

Parameter description: Specifies whether to enable log compression.

Value range: Boolean For details about how to modify this parameter, see Table 2.

• on indicates that log compression is enabled.
• off indicates that log compression is disabled.

Default value: on

agent_backup_open

Parameter description: Specifies the DR database instance settings. After this parameter is enabled, CM runs in DR database instance mode.

Value range: 0 or 1. You need to restart cm_agent for the modification to take effect. For details about how to modify this parameter, see Table 1.

• 0: disabled.
• 1: enabled.

Default value: 0

enable_xc_maintenance_mode

Parameter description: Specifies whether the pgxc_node system catalog can be modified when the database instance is in read-only mode.

Value range: Boolean Any modification of this parameter takes effect only after cm_agent is restarted. For details about how to modify this parameter, see Table 1.

• on indicates that the pgxc_node system catalog can be modified.
• off indicates that the pgxc_node system catalog cannot be modified.

Default value: on

unix_socket_directory

Parameter description: Specifies the directory location of the Unix socket.

Value range: a string For details about how to modify this parameter, see Table 1.

Default value: ''

enable_dcf

Parameter description: Specifies the status of the DCF mode.

Value range: Boolean Any modification of this parameter takes effect only after cm_agent is restarted. For details about how to modify this parameter, see Table 1.

• 0: disabled.
• 1: enabled.

Default value: off

disaster_recovery_type

Parameter description: Specifies the type of the DR relationship between the primary and standby database instances.

Value range: an integer ranging from 0 to 2 For details about how to modify this parameter, see Table 1.

• 0 indicates that no DR relationship is established.
• 1 indicates that the OBS DR relationship is established.
• 2 indicates that the streaming DR relationship is established.

Default value: 0