TBDS MPP参数列表

name	setting	description
application_name	ssql	Sets the application name to be reported in statistics and logs.
archive_cleanup_command		Sets the shell command that will be executed at every restart point.
archive_command	(disabled)	Sets the shell command that will be called to archive a WAL file.
archive_mode	off	Allows archiving of WAL files using archive_command.
archive_timeout	0	Forces a switch to the next WAL file if a new file has not been started within N seconds.
array_nulls	on	Enable input of NULL elements in arrays.
authentication_timeout	1min	Sets the maximum allowed time to complete client authentication.
autovacuum	off	Starts the autovacuum subprocess.
autovacuum_analyze_scale_factor	0.1	Number of tuple inserts, updates, or deletes prior to analyze as a fraction of reltuples.
autovacuum_analyze_threshold	50	Minimum number of tuple inserts, updates, or deletes prior to analyze.
autovacuum_freeze_max_age	200000000	Age at which to autovacuum a table to prevent transaction ID wraparound.
autovacuum_max_workers	3	Sets the maximum number of simultaneously running autovacuum worker processes.
autovacuum_multixact_freeze_max_age	400000000	Multixact age at which to autovacuum a table to prevent multixact wraparound.
autovacuum_naptime	1min	Time to sleep between autovacuum runs.
autovacuum_vacuum_cost_delay	2ms	Vacuum cost delay in milliseconds, for autovacuum.
autovacuum_vacuum_cost_limit	-1	Vacuum cost amount available before napping, for autovacuum.
autovacuum_vacuum_scale_factor	0.2	Number of tuple updates or deletes prior to vacuum as a fraction of reltuples.
autovacuum_vacuum_threshold	50	Minimum number of tuple updates or deletes prior to vacuum.
autovacuum_work_mem	-1	Sets the maximum memory to be used by each autovacuum worker process.
backend_flush_after	0	Number of pages after which previously performed writes are flushed to disk.
backslash_quote	safe_encoding	Sets whether “'” is allowed in string literals.
bgwriter_delay	200ms	Background writer sleep time between rounds.
bgwriter_flush_after	2MB	Number of pages after which previously performed writes are flushed to disk.
bgwriter_lru_maxpages	100	Background writer maximum number of LRU pages to flush per round.
bgwriter_lru_multiplier	2	Multiple of the average buffer usage to free per round.
block_size	32768	Shows the size of a disk block.
bonjour	off	Enables advertising the server via Bonjour.
bonjour_name		Sets the Bonjour service name.
bytea_output	hex	Sets the output format for bytea.
check_function_bodies	on	Check function bodies during CREATE FUNCTION.
checkpoint_completion_target	0.5	Time spent flushing dirty buffers during checkpoint, as fraction of checkpoint interval.
checkpoint_flush_after	1MB	Number of pages after which previously performed writes are flushed to disk.
checkpoint_timeout	5min	Sets the maximum time between automatic WAL checkpoints.
checkpoint_warning	30s	Enables warnings if checkpoint segments are filled more frequently than this.
client_encoding	UTF8	Sets the client’s character set encoding.
client_min_messages	notice	Sets the message levels that are sent to the client.
cluster_name		Sets the name of the cluster, which is included in the process title.
commit_delay	0	Sets the delay in microseconds between transaction commit and flushing WAL to disk.
commit_siblings	5	Sets the minimum concurrent open transactions before performing commit_delay.
config_file	/home/seabox/ seabox-data-directory/ coordinatordd/0/ seaboxsql.conf	Sets the server’s main configuration file.
constraint_exclusion	partition	Enables the planner to use constraints to optimize queries.
cpu_index_tuple_cost	0.005	Sets the planner’s estimate of the cost of processing each index entry during an index scan.
cpu_operator_cost	0.0025	Sets the planner’s estimate of the cost of processing each operator or function call.
cpu_tuple_cost	0.01	Sets the planner’s estimate of the cost of processing each tuple (row).
cursor_tuple_fraction	0.1	Sets the planner’s estimate of the fraction of a cursor’s rows that will be retrieved.
cursor_tuple_fraction	0.1	Sets the planner’s estimate of the fraction of a cursor’s rows that will be retrieved.
data_checksums	on	Shows whether data checksums are turned on for this cluster.
data_directory	/home/seabox/ seabox-data-directory/ coordinatordd/0	Sets the server’s data directory.
data_directory_mode	0700	Mode of the data directory.
data_encryption	off	Shows whether data encryption is turned on for this cluster.
data_sync_retry	off	Whether to continue running after a failure to sync data files.
DateStyle	ISO, MDY	Sets the display format for date and time values.
db_user_namespace	off	Enables per-database user names.
deadlock_timeout	1s	Sets the time to wait on a lock before checking for deadlock.
debug_assertions	off	Shows whether the running server has assertion checks enabled.
debug_deadlocks	off	Dumps information about all current locks when a deadlock timeout occurs.
debug_disable_vecengine		disable some oprators of batch execution.
debug_pretty_print	on	Indents parse and plan tree displays.
debug_print_parse	off	Logs each query’s parse tree.
debug_print_plan	off	Logs each query’s execution plan.
debug_print_prelim_plan	off	Prints the preliminary execution plan to server log.
debug_print_rewritten	off	Logs each query’s rewritten parse tree.
debug_print_slice_table	off	Prints the slice table to server log.
debug_ve_buffer_data_size	512MB	ve block buffer data size
debug_ve_buffer_queue_size	128	ve block buffer queue size
debug_ve_function	hybrid	The options of function debug.
debug_vecengine		vecengine debug option.
default_decimal_precision	18	Default decimal precision.
default_decimal_scale	2	Default decimal precision.
default_statistics_target	100	Sets the default statistics target.
default_table_access_method	heap	Sets the default table access method for new tables.
default_tablespace		Sets the default tablespace to create tables and indexes in.
default_text_search_config	pg_catalog.simple	Sets default text search configuration.
default_transaction_deferrable	off	Sets the default deferrable status of new transactions.
default_transaction_isolation	read committed	Sets the transaction isolation level of each new transaction.
default_transaction_read_only	off	Sets the default read-only status of new transactions.
dynamic_library_path	$libdir	Sets the path for dynamically loadable modules.
dynamic_shared_memory_type	posix	Selects the dynamic shared memory implementation used.
effective_cache_size	16GB	Sets the planner’s assumption about the total size of the data caches.
effective_io_concurrency	1	Number of simultaneous requests that can be handled efficiently by the disk subsystem.
enable_bitmapscan	on	Enables the planner’s use of bitmap-scan plans.
enable_dump_io_statistics	off	Enable dump io performance counters.
enable_gathermerge	on	Enables the planner’s use of gather merge plans.
enable_groupagg	on	Enables the planner’s use of grouping aggregation plans.
enable_groupingsets_hash_disk	off	Enables the planner’s use of hashed aggregation plans for groupingsets when the total size of the hash tables is expected to exceed work_mem.
enable_hashagg	on	Enables the planner’s use of hashed aggregation plans.
enable_hashagg_disk	on	Enables the planner’s use of hashed aggregation plans that are expected to exceed work_mem.
enable_hashjoin	on	Enables the planner’s use of hash join plans.
enable_indexonlyscan	on	Enables the planner’s use of index-only-scan plans.
enable_indexscan	on	Enables the planner’s use of index-scan plans.
enable_material	on	Enables the planner’s use of materialization.
enable_mergejoin	on	Enables the planner’s use of merge join plans.
enable_minimize_tlist	on	Enable prune target list.
enable_nestloop	on	Enables the planner’s use of nested-loop join plans.
enable_parallel_append	on	Enables the planner’s use of parallel append plans.
enable_parallel_hash	on	Enables the planner’s use of parallel hash plans.
enable_partition_pruning	on	Enables plan-time and run-time partition pruning.
enable_partitionwise_aggregate	off	Enables partitionwise aggregation and grouping.
enable_partitionwise_join	off	Enables partitionwise join.
enable_runtime_filter	on	Enable runtime filter.
enable_seqscan	on	Enables the planner’s use of sequential-scan plans.
enable_sort	on	Enables the planner’s use of explicit sort steps.
enable_table_flashback	off	Enable drop table use flashback.
enable_tidscan	on	Enables the planner’s use of TID scan plans.
enable_vecengine	off	Enable vector engine.
escape_string_warning	on	Warn about backslash escapes in ordinary string literals.
event_source	SeaboxSQL	Sets the application name used to identify SeaboxSQL messages in the event log.
exit_on_error	off	Terminate session on any error.
explain_memory_verbosity	suppress	Experimental feature: show memory account usage in EXPLAIN ANALYZE.
external_pid_file		Writes the seaboxmaster PID to the specified file.
extra_float_digits	1	Sets the number of digits displayed for floating-point values.
force_parallel_mode	off	Forces use of parallel query facilities.
from_collapse_limit	8	Sets the FROM-list size beyond which subqueries are not collapsed.
fsync	on	Forces synchronization of updates to disk.
full_page_writes	on	Writes full pages to WAL when first modified after a checkpoint.
function_hybrid	on	Set hybrid function for vector engine.
geqo	on	Enables genetic query optimization.
geqo_effort	5	GEQO: effort is used to set the default for other GEQO parameters.
geqo_generations	0	GEQO: number of iterations of the algorithm.
geqo_pool_size	0	GEQO: number of individuals in the population.
geqo_seed	0	GEQO: seed for random path selection.
geqo_selection_bias	2	GEQO: selective pressure within the population.
geqo_threshold	12	Sets the threshold of FROM items beyond which GEQO is used.
gin_fuzzy_search_limit	0	Sets the maximum allowed result for exact search by GIN.
gin_pending_list_limit	4MB	Sets the maximum size of the pending list for GIN index.
hba_file	/home/seabox/ seabox-data-directory/ coordinatordd/0/sd_hba.conf	Sets the server’s “hba” configuration file.
hot_standby	on	Allows connections and queries during recovery.
hot_standby_feedback	off	Allows feedback from a hot standby to the primary that will avoid query conflicts.
huge_pages	try	Use of huge pages on Linux or Windows.
ident_file	/home/seabox/ seabox-data-directory/ coordinatordd/0/sd_ident.conf	Sets the server’s “ident” configuration file.
idle_in_transaction_session_timeout	0	Sets the maximum allowed duration of any idling transaction.
ignore_checksum_failure	off	Continues processing after a checksum failure.
ignore_system_indexes	off	Disables reading from system indexes.
integer_datetimes	on	Datetimes are integer based.
IntervalStyle	postgres	Sets the display format for interval values.
jit	off	Allow JIT compilation.
jit_above_cost	100000	Perform JIT compilation if query is more expensive.
jit_debugging_support	off	Register JIT compiled function with debugger.
jit_dump_bitcode	off	Write out LLVM bitcode to facilitate JIT debugging.
jit_expressions	on	Allow JIT compilation of expressions.
jit_inline_above_cost	500000	Perform JIT inlining if query is more expensive.
jit_optimize_above_cost	500000	Optimize JITed functions if query is more expensive.
jit_profiling_support	off	Register JIT compiled function with perf profiler.
jit_provider	llvmjit	JIT provider to use.
jit_tuple_deforming	on	Allow JIT compilation of tuple deforming.
join_collapse_limit	8	Sets the FROM-list size beyond which JOIN constructs are not flattened.
krb_caseins_users	off	Sets whether Kerberos and GSSAPI user names should be treated as case-insensitive.
krb_server_keyfile		Sets the location of the Kerberos server key file.
lc_collate	en_US.utf8	Shows the collation order locale.
lc_ctype	en_US.utf8	Shows the character classification and case conversion locale.
lc_messages	en_US.utf8	Sets the language in which messages are displayed.
lc_monetary	en_US.utf8	Sets the locale for formatting monetary amounts.
lc_numeric	en_US.utf8	Sets the locale for formatting numbers.
lc_time	en_US.utf8	Sets the locale for formatting date and time values.
listen_addresses	*	Sets the host name or IP address(es) to listen to.
lo_compat_privileges	off	Enables backward compatibility mode for privilege checks on large objects.
local_preload_libraries		Lists unprivileged shared libraries to preload into each backend.
lock_timeout	0	Sets the maximum allowed duration of any wait for a lock.
log_autovacuum_min_duration	-1	Sets the minimum execution time above which autovacuum actions will be logged.
log_checkpoints	off	Logs each checkpoint.
log_connections	off	Logs each successful connection.
log_destination	csvlog	Sets the destination for server log output.
log_directory	log	Sets the destination directory for log files.
log_disconnections	off	Logs end of a session, including duration.
log_duration	off	Logs the duration of each completed SQL statement.
log_error_verbosity	default	Sets the verbosity of logged messages.
log_executor_stats	off	Writes executor performance statistics to the server log.
log_file_mode	0600	Sets the file permissions for log files.
log_filename	seaboxsql-%Y-%m-%d_%H%M%S.log	Sets the file name pattern for log files.
log_hostname	off	Logs the host name in the connection logs.
log_line_prefix	%m [%p]	Controls information prefixed to each log line.
log_lock_waits	off	Logs long lock waits.
log_min_duration_statement	-1	Sets the minimum execution time above which statements will be logged.
log_min_error_statement	error	Causes all statements generating error at or above this level to be logged.
log_min_messages	warning	Sets the message levels that are logged.
log_parser_stats	off	Writes parser performance statistics to the server log.
log_planner_stats	off	Writes planner performance statistics to the server log.
log_replication_commands	off	Logs each replication command.
log_rotation_age	1d	Automatic log file rotation will occur after N minutes.
log_rotation_size	10MB	Automatic log file rotation will occur after N kilobytes.
log_statement	none	Sets the type of statements logged.
log_statement_stats	off	Writes cumulative performance statistics to the server log.
log_temp_files	-1	Log the use of temporary files larger than this number of kilobytes.
log_timezone	Asia/Shanghai	Sets the time zone to use in log messages.
log_transaction_sample_rate	0	Set the fraction of transactions to log for new transactions.
log_truncate_on_rotation	off	Truncate existing log files of same name during log rotation.
logging_collector	on	Start a subprocess to capture stderr output and/or csvlogs into log files.
maintenance_work_mem	64MB	Sets the maximum memory to be used for maintenance operations.
max_connections	250	Sets the maximum number of concurrent connections.
max_files_per_process	1000	Sets the maximum number of simultaneously open files for each server process.
max_function_args	100	Shows the maximum number of function arguments.
max_identifier_length	63	Shows the maximum identifier length.
max_index_keys	32	Shows the maximum number of index keys.
max_locks_per_transaction	64	Sets the maximum number of locks per transaction.
max_logical_replication_workers	4	Maximum number of logical replication worker processes.
max_parallel_maintenance_workers	2	Sets the maximum number of parallel processes per maintenance operation.
max_parallel_workers	8	Sets the maximum number of parallel workers that can be active at one time.
max_parallel_workers_per_gather	0	Sets the maximum number of parallel processes per executor node.
max_pred_locks_per_page	2	Sets the maximum number of predicate-locked tuples per page.
max_pred_locks_per_relation	-2	Sets the maximum number of predicate-locked pages and tuples per relation.
max_pred_locks_per_transaction	64	Sets the maximum number of predicate locks per transaction.
max_prepared_transactions	50	Sets the maximum number of simultaneously prepared transactions.
max_replication_slots	10	Sets the maximum number of simultaneously defined replication slots.
max_resource_portals_per_transaction	64	Maximum number of resource queues.
max_resource_queues	9	Maximum number of resource queues.
max_stack_depth	2MB	Sets the maximum stack depth, in kilobytes.
max_standby_archive_delay	30s	Sets the maximum delay before canceling queries when a hot standby server is processing archived WAL data.
max_standby_streaming_delay	30s	Sets the maximum delay before canceling queries when a hot standby server is processing streamed WAL data.
max_sync_workers_per_subscription	2	Maximum number of table synchronization workers per subscription.
max_wal_senders	10	Sets the maximum number of simultaneously running WAL sender processes.
max_wal_size	1GB	Sets the WAL size that triggers a checkpoint.
max_worker_processes	8	Maximum number of concurrent worker processes.
memory_spill_ratio	20	Sets the memory_spill_ratio for resource group.
min_parallel_index_scan_size	512kB	Sets the minimum amount of index data for a parallel scan.
min_parallel_table_scan_size	8MB	Sets the minimum amount of table data for a parallel scan.
min_wal_size	80MB	Sets the minimum size to shrink the WAL to.
old_snapshot_threshold	-1	Time before a snapshot is too old to read pages changed after the snapshot was taken.
operator_precedence_warning	off	Emit a warning for constructs that changed meaning since SeaboxSQL 9.4.
optimizer	off	Enable SDORCA.
optimizer_analyze_root_partition	on	Enable statistics collection on root partitions during ANALYZE
optimizer_control	on	Allow/disallow turning the optimizer on or off.
optimizer_enable_associativity	off	Enables Join Associativity in optimizer
optimizer_join_arity_for_associativity_commutativity	18	Maximum number of children n-ary-join have without disabling commutativity and associativity transform
optimizer_join_order	exhaustive	Set optimizer join heuristic model.
optimizer_join_order_threshold	10	Maximum number of join children to use dynamic programming based join ordering algorithm.
optimizer_mdcache_size	16MB	Sets the size of MDCache.
optimizer_metadata_caching	on	This guc enables the optimizer to cache and reuse metadata.
optimizer_minidump	onerror	Generate optimizer minidump.
optimizer_parallel_union	off	Enable parallel execution for UNION/UNION ALL queries.
parallel_leader_participation	on	Controls whether Gather and Gather Merge also run subplans.
parallel_setup_cost	1000	Sets the planner’s estimate of the cost of starting up worker processes for parallel query.
parallel_tuple_cost	0.1	Sets the planner’s estimate of the cost of passing each tuple (row) from worker to master backend.
password_encryption	md5	Chooses the algorithm for encrypting passwords.
pgxc_node_name	coord1	The Coordinator or Datanode name.
plan_cache_mode	auto	Controls the planner’s selection of custom or generic plan.
pljava_classpath		classpath used by the the JVM
pljava_classpath_insecure	off	Allow pljava_classpath to be set by user per session
pljava_release_lingering_savepoints	off	If true, lingering savepoints will be released on function exit; if false, they will be rolled back
pljava_statement_cache_size	0	Size of the prepared statement MRU cache
pljava_vmoptions		Options sent to the JVM when it is created
port	3000	Sets the TCP port the server listens on.
post_auth_delay	0	Waits N seconds on connection startup after authentication.
pre_auth_delay	0	Waits N seconds on connection startup before authentication.
primary_conninfo		Sets the connection string to be used to connect to the sending server.
primary_slot_name		Sets the name of the replication slot to use on the sending server.
promote_trigger_file		Specifies a file name whose presence ends recovery in the standby.
quote_all_identifiers	off	When generating SQL fragments, quote all identifiers.
random_page_cost	4	Sets the planner’s estimate of the cost of a nonsequentially fetched disk page.
readable_external_table_timeout	1min	Cancel the query if no data read within N seconds.
recovery_end_command		Sets the shell command that will be executed once at the end of recovery.
recovery_min_apply_delay	0	Sets the minimum delay for applying changes during recovery.
recovery_skip_sync_data_dir	on	Skip the data directory synchronization of column tables while recoverying.
recovery_target		Set to “immediate” to end recovery as soon as a consistent state is reached.
recovery_target_action	pause	Sets the action to perform upon reaching the recovery target.
recovery_target_inclusive	on	Sets whether to include or exclude transaction with recovery target.
recovery_target_lsn		Sets the LSN of the write-ahead log location up to which recovery will proceed.
recovery_target_name		Sets the named restore point up to which recovery will proceed.
recovery_target_time		Sets the time stamp up to which recovery will proceed.
recovery_target_timeline	latest	Specifies the timeline to recover into.
recovery_target_xid		Sets the transaction ID up to which recovery will proceed.
resource_cleanup_gangs_on_wait	on	Enable idle gang cleanup before resource lockwait.
resource_scheduler	on	Enable resource scheduling.
resource_select_only	off	Enable resource locking of SELECT only.
restart_after_crash	on	Reinitialize server after backend crash.
restore_command		Sets the shell command that will retrieve an archived WAL file.
row_security	on	Enable row security.
runaway_detector_activation_percent	90	The runaway detector activates if the used vmem exceeds this percentage of the vmem quota. Set to 100 to disable runaway detection.
sc_active_backend_resqueue_length_cv	0	set to true to use new sc_active_backend_resqueue implemented with cv.
sc_adjust_selectivity_for_outerjoins	on	Adjust selectivity of null tests over outer joins.
sc_autostats_mode	none	Sets the autostats mode.
sc_autostats_mode_in_functions	none	Sets the autostats mode for statements in procedural language functions.
sc_cached_segworkers_threshold	5	Sets the maximum number of executor workers to cache between statements.
sc_command_count	1	Shows the number of commands received from the client in this session.
sc_contentid	-1	The contentid used by this server.
sc_create_table_random_default_distribution	off	Set the default distribution of a table to RANDOM.
sc_dbid	1	The dbid used by this server.
sc_dcs_conn_str	172.16.3.76:2379	The scdcs connection string used by this server.
sc_dcs_top_path	/seabox	The scdcs top path for this cluster.
sc_debug_linger	0	Number of seconds for QD/QE process to linger upon fatal internal error.
sc_default_storage_options	blocksize=1048576, compresstype=auto, charsemantics=byte, compresslevel=1, checksum=true, blockrownum=32768, cache=false	default options for scolumn storage.
sc_dtx_recovery_interval	1min	A complete checking in dtx recovery process starts each time a timer with this period expires.
sc_dtx_recovery_prepared_period	2min	Gather prepared transactions before the time (in seconds) to find potential orphaned ones.
sc_dynamic_partition_pruning	on	This guc enables plans that can dynamically eliminate scanning of partitions.
sc_enable_agg_distinct	on	Enable 2-phase aggregation to compute a single distinct-qualified aggregate.
sc_enable_agg_distinct_pruning	on	Enable 3-phase aggregation and join to compute distinct-qualified aggregates.
sc_enable_direct_dispatch	on	Enable dispatch for single-row-insert targetted mirror-pairs.
sc_enable_explain_memory_account	off	Enable memory account in EXPLAIN ANALYZE.
sc_enable_fast_sri	on	Enable single-slice single-row inserts.
sc_enable_global_deadlock_detector	on	Enables the Global Deadlock Detector.
sc_enable_minmax_optimization	on	Enables the planner’s use of index scans with limit to implement MIN/MAX.
sc_enable_multiphase_agg	on	Enables the planner’s use of two- or three-stage parallel aggregation plans.
sc_enable_opt_no_mergejoin	off	This guc force mergejoin path not to be generated.
sc_enable_predicate_propagation	on	When two expressions are equivalent (such as with equijoined keys) then the planner applies predicates on one expression to the other expression.
sc_enable_preunique	on	Enable 2-phase duplicate removal.
sc_enable_query_metrics	off	Enable all query metrics collection.
sc_enable_relsize_collection	off	This guc enables relsize collection when stats are not present. If disabled and stats are not present a default value is used.
sc_enable_sort_distinct	on	Enable duplicate removal to be performed while sorting.
sc_enable_sort_limit	on	Enable LIMIT operation to be performed while sorting.
sc_executors_for_planner	0	If >0, number of executor dbs for the planner to assume in its cost and size estimates.
sc_external_enable_exec	on	Enable selecting from an external table with an EXECUTE clause.
sc_external_enable_filter_pushdown	on	Enable passing of query constraints to external table providers
sc_external_max_execs	64	Maximum number of executors that connect to a single scfs URL.
sc_external_table_default_size	819200s	Default value for external table size.
sc_fts_mark_mirror_down_grace_period	30s	Time (in seconds) allowed to mirror after disconnection, to reconnect before being marked as down in configuration by FTS.
sc_fts_probe_interval	10s	A complete probe of all executors starts each time a timer with this period expires.
sc_fts_probe_retries	5	Number of retries for FTS to complete probing a executor.
sc_fts_probe_timeout	20	Maximum time (in seconds) allowed for FTS to complete probing a executor.
sc_global_deadlock_detector_period	30s	Sets the executing period of global deadlock detector backend.
sc_hashjoin_tuples_per_bucket	1	Target density of hashtable used by Hashjoin during execution
sc_instrument_shmem_size	5MB	Sets the size of shmem allocated for instrumentation.
sc_interconnect_cache_future_packets	on	Control whether future packets are cached.
sc_interconnect_debug_retry_interval	10	Sets the interval by retry times to record a debug message for retry.
sc_interconnect_default_rtt	20ms	Sets the default rtt (in ms) for UDP interconnect
sc_interconnect_fc_method	loss	Sets the flow control method used for UDP interconnect.
sc_interconnect_min_retries_before_timeout	100	Sets the min retries before reporting a transmit timeout in the interconnect.
sc_interconnect_min_rto	20ms	Sets the min rto (in ms) for UDP interconnect
sc_interconnect_queue_depth	4	Sets the maximum size of the receive queue for each connection in the UDP interconnect
sc_interconnect_setup_timeout	2h	Timeout (in seconds) on interconnect setup that occurs at query start
sc_interconnect_snd_queue_depth	2	Sets the maximum size of the send queue for each connection in the UDP interconnect
sc_interconnect_tcp_listener_backlog	128	Size of the listening queue for each TCP interconnect socket
sc_interconnect_timer_checking_period	20ms	Sets the timer checking period (in ms) for UDP interconnect
sc_interconnect_timer_period	5ms	Sets the timer period (in ms) for UDP interconnect
sc_interconnect_transmit_timeout	1h	Timeout (in seconds) on interconnect to transmit a packet
sc_interconnect_type	udpifc	Sets the protocol used for inter-node communication.
sc_max_local_distributed_cache	1024	Sets the number of local-distributed transactions to cache for optimizing visibility processing by backends.
sc_max_packet_size	32768	Sets the max packet size for the Interconnect.
sc_max_partition_level	0	Sets the maximum number of levels allowed when creating a partitioned table.
sc_max_plan_size	0	Sets the maximum size of a plan to be dispatched.
sc_max_slices	0	Maximum slices for a single query
sc_module_register_time	10	Define how often module must register to scdcs. Unit: second
sc_motion_cost_per_row	0	Sets the planner’s estimate of the cost of moving a row between worker processes.
sc_node_connect_timeout	3min	Maximum time (in seconds) allowed for a new worker process to start or a mirror to respond.
sc_numa_policy	none	Sets the type of numa.
sc_reject_percent_threshold	300	Reject limit in percent starts calculating after this number of rows processed
sc_resgroup_memory_policy	eager_free	Sets the policy for memory allocation of queries.
sc_resource_group_bypass	off	If the value is true, the query in this session will not be limited by resource group.
sc_resource_group_cgroup_memory	0	Set value of total memory in resource group mode.
sc_resource_group_cpu_limit	0.9	Maximum percentage of CPU resources assigned to a cluster.
sc_resource_group_cpu_priority	10	Sets the cpu priority for seaboxsql processes when resource group is enabled.
sc_resource_group_memory_limit	0.7	Maximum percentage of memory resources assigned to a cluster.
sc_resource_group_queuing_timeout	0	A transaction gives up on queuing on a resource group after this timeout (in ms).
sc_resource_manager	none	Sets the type of resource manager.
sc_resqueue_memory_policy	eager_free	Sets the policy for memory allocation of queries.
sc_resqueue_priority	on	Enables priority scheduling.
sc_resqueue_priority_cpucores_per_executor	1	Number of processing units associated with a executor.
sc_resqueue_priority_sweeper_interval	1000	Frequency (in ms) at which sweeper process re-evaluates CPU shares.
sc_scolumn_compaction_threshold	10	Threshold of the ratio of dirty data in a executor file over which the file will be compacted during lazy vacuum.
sc_session_id	268435471	Global ID used to uniquely identify a particular session in an Seabox Database array
sc_subtrans_warn_limit	16777216	Sets the warning limit on number of subtransactions in a transaction.
sc_temptable_buffer_skip_flush	on	temptable shared buffer skip flush if relfile not exists.
sc_udp_bufsize_k	0	Sets recv buf size of UDP interconnect, for testing.
sc_ve_hash_mem	10GB	The hash table memory size in kB
sc_ve_mem_limit	0	The memory limit of vecengine in kB
sc_ve_two_level_hash_mem	100MB	Min kB to use 2-level hash
sc_vmem_idle_resource_timeout	18s	Sets the time a session can be idle (in milliseconds) before we release gangs on the executor DBs to free resources.
sc_vmem_protect_limit	102400	Virtual memory limit (in MB) of Seabox database memory protection.
sc_vmem_protect_segworker_cache_limit	500	Max virtual memory limit (in MB) for a segworker to be cachable.
sc_workfile_compression	off	Enables compression of temporary files.
sc_workfile_limit_files_per_query	100000	Maximum number of workfiles allowed per query per executor.
sc_workfile_limit_per_executor	0	Maximum disk space (in KB) used for workfiles per executor.
sc_workfile_limit_per_query	0	Maximum disk space (in KB) used for workfiles per query per executor.
sc_workfile_limit_per_query	0	Maximum disk space (in KB) used for workfiles per query per executor.
sc_workfile_max_entries	8192	Sets the maximum number of entries that can be stored in the workfile directory.
scolumn_delete_option	hash	The options of update/delete on scolumn when has join.
scolumn_heap_cache_option	off	The options of scolumn cache table’s usage.
scolumn_row_to_block_threshold	32768	Shows the threshold of rows of data in heap cache table convert to column.
scolumn_sample_method	vitter2	Sample method for scolumn.
scolumn_sparse_index	on	Enable scolumn table use sparse index.
scolumn_stats_level	1	level of calculating stats of column.
scolumn_store_sort	on	SColumn store data partitial sorted.
scolumn_update_one_to_multi	off	Enable scolumn table to update one row to multi-records.
scolumn_wal_block_size	64kB	Shows the block size that scolumn storage write in the write ahead log.
scolumn_wal_check_level	0	The check leve of scolumn wal between primary and mirror.
sd_enable_crash_log	on	Do not write stack information to log file.
sd_enable_mac	off	Support Mandatory Access Control(mac).
sd_role	dispatch	Sets the role for the session.
search_path	“$user”, public	Sets the schema search order for names that are not schema-qualified.
segment_size	1GB	Shows the number of pages per disk file.
seq_page_cost	1	Sets the planner’s estimate of the cost of a sequentially fetched disk page.
server_encoding	UTF8	Sets the server (database) character set encoding.
server_version	12.3	Shows the server version.
server_version_num	120003	Shows the server version as an integer.
session_preload_libraries		Lists shared libraries to preload into each backend.
session_replication_role	origin	Sets the session’s behavior for triggers and rewrite rules.
shared_buffers	128MB	Sets the number of shared memory buffers used by the server.
shared_memory_type	mmap	Selects the shared memory implementation used for the main shared memory region.
shared_preload_libraries		Lists shared libraries to preload into server.
ssl	off	Enables SSL connections.
ssl_ca_file		Location of the SSL certificate authority file.
ssl_cert_file	server.crt	Location of the SSL server certificate file.
ssl_ciphers	HIGH:MEDIUM:+3DES:!aNULL	Sets the list of allowed SSL ciphers.
ssl_crl_file		Location of the SSL certificate revocation list file.
ssl_dh_params_file		Location of the SSL DH parameters file.
ssl_ecdh_curve	prime256v1	Sets the curve to use for ECDH.
ssl_key_file	server.key	Location of the SSL server private key file.
ssl_library	OpenSSL	Name of the SSL library.
ssl_max_protocol_version		Sets the maximum SSL/TLS protocol version to use.
ssl_min_protocol_version	TLSv1	Sets the minimum SSL/TLS protocol version to use.
ssl_passphrase_command		Command to obtain passphrases for SSL.
ssl_passphrase_command_supports_reload	off	Also use ssl_passphrase_command during server reload.
ssl_prefer_server_ciphers	on	Give priority to server ciphersuite order.
standard_conforming_strings	on	Causes ‘…’ strings to treat backslashes literally.
statement_mem	125MB	Sets the memory to be reserved for a statement.
statement_timeout	0	Sets the maximum allowed duration of any statement.
stats_queue_level	off	Collects resource queue-level statistics on database activity.
stats_temp_directory	sd_stat_tmp	Writes temporary statistics files to the specified directory.
superuser_reserved_connections	3	Sets the number of connection slots reserved for superusers.
synchronize_seqscans	on	Enable synchronized sequential scans.
synchronous_commit	on	Sets the current transaction’s synchronization level.
synchronous_standby_names		Number of synchronous standbys and list of names of potential synchronous ones.
syslog_facility	local0	Sets the syslog “facility” to be used when syslog enabled.
syslog_ident	seaboxsql	Sets the program name used to identify SeaboxSQL messages in syslog.
syslog_sequence_numbers	on	Add sequence number to syslog messages to avoid duplicate suppression.
syslog_split_messages	on	Split messages sent to syslog by lines and to fit into 1024 bytes.
tcp_keepalives_count	0	Maximum number of TCP keepalive retransmits.
tcp_keepalives_idle	0	Time between issuing TCP keepalives.
tcp_keepalives_interval	0	Time between TCP keepalive retransmits.
tcp_user_timeout	0	TCP user timeout.
temp_buffers	32MB	Sets the maximum number of temporary buffers used by each session.
temp_file_limit	-1	Limits the total size of all temporary files used by each process.
temp_tablespaces		Sets the tablespace(s) to use for temporary tables and sort files.
TimeZone	Asia/Shanghai	Sets the time zone for displaying and interpreting time stamps.
timezone_abbreviations	Default	Selects a file of time zone abbreviations.
trace_lock_oidmin	16384	Sets the minimum OID of tables for tracking locks.
trace_lock_table	0	Sets the OID of the table with unconditionally lock tracing.
trace_locks	off	Emits information about lock usage.
trace_lwlocks	off	Emits information about lightweight lock usage.
trace_notify	off	Generates debugging output for LISTEN and NOTIFY.
trace_recovery_messages	log	Enables logging of recovery-related debugging information.
trace_sort	off	Emit information about resource usage in sorting.
trace_userlocks	off	Emits information about user lock usage.
traceme_flags		debug option to enable extra trace_me flags.
track_activities	on	Collects information about executing commands.
track_activity_query_size	1kB	Sets the size reserved for pg_stat_activity.query, in bytes.
track_commit_timestamp	off	Collects transaction commit time.
track_counts	on	Collects statistics on database activity.
track_functions	none	Collects function-level statistics on database activity.
track_io_timing	off	Collects timing statistics for database I/O activity.
transaction_deferrable	off	Whether to defer a read-only serializable transaction until it can be executed with no possible serialization failures.
transaction_isolation	read committed	Sets the current transaction’s isolation level.
transaction_read_only	off	Sets the current transaction’s read-only status.
transform_null_equals	off	Treats “expr=NULL” as “expr IS NULL”.
unix_socket_directories	/tmp	Sets the directories where Unix-domain sockets will be created.
unix_socket_group		Sets the owning group of the Unix-domain socket.
unix_socket_permissions	0777	Sets the access permissions of the Unix-domain socket.
update_process_title	on	Updates the process title to show the active SQL command.
vacuum_cleanup_index_scale_factor	0.1	Number of tuple inserts prior to index cleanup as a fraction of reltuples.
vacuum_cost_delay	0	Vacuum cost delay in milliseconds.
vacuum_cost_limit	200	Vacuum cost amount available before napping.
vacuum_cost_page_dirty	20	Vacuum cost for a page dirtied by vacuum.
vacuum_cost_page_hit	1	Vacuum cost for a page found in the buffer cache.
vacuum_cost_page_miss	10	Vacuum cost for a page not found in the buffer cache.
vacuum_defer_cleanup_age	0	Number of transactions by which VACUUM and HOT cleanup should be deferred, if any.
vacuum_freeze_min_age	50000000	Minimum age at which VACUUM should freeze a table row.
vacuum_freeze_table_age	150000000	Age at which VACUUM should scan whole table to freeze tuples.
vacuum_multixact_freeze_min_age	5000000	Minimum age at which VACUUM should freeze a MultiXactId in a table row.
vacuum_multixact_freeze_table_age	150000000	Multixact age at which VACUUM should scan whole table to freeze tuples.
ve_aggr_always_nullable	on	Whether VE should make aggregate functions return nullable result.
ve_copy_strict_mode	on	Whether VE should use strict check for end-of-line in CSV-mode, it means that no end-of-line is allowed in quote.
vecengine_block_row_num	32768	Set block row number for vector engine.
vecengine_parallel_degree	1	Set parallel degree for vector engine.
vecengine_write_degree	0	Set write degree for vector engine.
version	21.0.3.460	Shows the SeaboxSQL version.
wait_for_replication_threshold	200MB	Maximum amount of WAL written by a transaction prior to waiting for replication.
wal_block_size	8192	Shows the block size in the write ahead log.
wal_buffers	1MB	Sets the number of disk-page buffers in shared memory for WAL.
wal_compression	off	Compresses full-page writes written in WAL file.
wal_consistency_checking		Sets the WAL resource managers for which WAL consistency checks are done.
wal_init_zero	on	Writes zeroes to new WAL files before first use.
wal_keep_segments	5	Sets the number of WAL files held for standby servers.
wal_level	replica	Set the level of information written to the WAL.
wal_log_hints	off	Writes full pages to WAL when first modified after a checkpoint, even for a non-critical modifications.
wal_receiver_status_interval	10s	Sets the maximum interval between WAL receiver status reports to the sending server.
wal_receiver_timeout	1min	Sets the maximum wait time to receive data from the sending server.
wal_recycle	on	Recycles WAL files by renaming them.
wal_retrieve_retry_interval	5s	Sets the time to wait before retrying to retrieve WAL after a failed attempt.
wal_segment_size	16MB	Shows the size of write ahead log segments.
wal_sender_timeout	1min	Sets the maximum time to wait for WAL replication.
wal_sync_method	fdatasync	Selects the method used for forcing WAL updates to disk.
wal_writer_delay	200ms	Time between WAL flushes performed in the WAL writer.
wal_writer_flush_after	1MB	Amount of WAL written out by WAL writer that triggers a flush.
work_mem	32MB	Sets the maximum memory to be used for query workspaces.
writable_external_table_bufsize	64kB	Buffer size in kilobytes for writable external table before writing data to scfs.
xmlbinary	base64	Sets how binary values are to be encoded in XML.
xmloption	content	Sets whether XML data in implicit parsing and serialization operations is to be considered as documents or content fragments.
zero_damaged_pages	off	Continues processing past damaged page headers.