Reserved Engine Variables

The following engine variables are currently reserved for internal use only:

Variable Name

Note

aggregator_id

allow_point_in_time_attach

allow_unsafe_bottomless_commands

allow_unsupported_filesystem

alter_signal_timeout

analyze_batch_size

as_aggregator

as_leaf

attach_force_skip_execution_errors

attach_rebalance_delay_seconds

auditlogsdir

auto_attach

auto_increment_increment

auto_increment_offset

auto_replicate

This variable exists for backwards compatibility with MySQL and is non-operational in SingleStore.

back_log

background_statistics_collection_interval

background_statistics_collection_threshold

backup_signal_timeout

binary_serialization

bind_address

blob_cache_sync_interval

bottomless_cloud_debug_tracing

bottomless_incremental_autostats_collection_threshold

bottomless_storage_location

buffered_rows

change_count_write_interval

character_set_client

This variable exists for backwards compatibility with MySQL and is non-operational in SingleStore.

character_set_connection

This variable exists for backwards compatibility with MySQL and is non-operational in SingleStore.

character_set_database

This variable exists for backwards compatibility with MySQL and is non-operational in SingleStore.

character_set_filesystem

This variable exists for backwards compatibility with MySQL and is non-operational in SingleStore.

character_set_results

This variable exists for backwards compatibility with MySQL and is non-operational in SingleStore.

character_set_system

The character set used to store identifiers. The value is read-only and always has the value utf8.

clamp_histogram_date_estimates

clear_orphan_databases_on_attach

cloud_permissions

columnar_segment_rows

Deprecated alias to columnstore_segment_rows.

columnstore_disk_insert_threshold

columnstore_json_trace_schema

columnstore_row_value_table_lock_threshold

columnstore_sample_per_partition_limit

columnstore_small_blob_combination_threshold

command_loop

compile_metadata_parallel

convert_nonunique_hash_to_skiplist

date_format

This variable exists for backwards compatibility with MySQL and is non-operational in SingleStore.

datetime_format

This variable exists for backwards compatibility with MySQL and is non-operational in SingleStore.

datetime_precision_mode

deadlock_avoidance_strategy

debug

debug_mode

default_autostats_columnstore_cardinality_mode

default_autostats_columnstore_sampling

default_autostats_histogram_mode

default_autostats_rowstore_cardinality_mode

default_columnstore_table_lock_threshold

default_max_histogram_buckets

default_week_format

defaults_file

disable_cluster_variables

disable_general_logging

disable_histogram_estimation

disable_sampling_estimation

disable_sampling_estimation_with_histograms

disable_subquery_merge_with_straight_joins

disable_update_delete_distributed_transactions

display_full_estimation_stats

distributed_connect_timeout

distributed_heartbeat_timeout

distributed_optimizer_estimated_restricted_search_cost_bound

distributed_optimizer_max_join_size

distributed_optimizer_min_join_size_run_initial_heuristics

distributed_optimizer_nodes

distributed_optimizer_old_selectivity_table_threshold

distributed_optimizer_run_legacy_heuristic

distributed_optimizer_selectivity_fallback_threshold

distributed_optimizer_unrestricted_search_threshold

distributed_optimizer_verbose

div_precision_increment

dont_convert_error_rolled_back_xact

durability

enable_auto_profile

enable_background_flusher

enable_background_merger

enable_background_statistics_collection

enable_binary_protocol

enable_blob_cache_sync_thread

enable_bottomless

enable_broadcast_left_join

enable_distributed_tracing

enable_eks_irsa

enable_histogram_to_unwrap_literals

enable_ir_cache

enable_local_shuffle_group_by

enable_multipartition_queries

enable_resource_pool_security

enable_sites

enable_skiplist_sampling_for_selectivity

enable_sort_on_load

end_tags_on_all_databases

error_count

This variable exists for backwards compatibility with MySQL and is non-operational in SingleStore.

estimate_zero_rows_when_sampling_data_is_missing

exclude_scalar_subselects_from_filters

experimental_csi_join_threshold

experimental_disable_multipartition_parallel_read

expire_root_password

explain_joinplan_costs

exporter_password

exporter_path

This variable is deprecated and non-operational.

exporter_ssl_key_passphrase

external_auth_tracing_time_limit

external_functions_whitelist

external_user

This variable exists for backwards compatibility with MySQL and is non-operational in SingleStore.

failover_initial_grace_interval_seconds

failover_maximum_grace_interval_seconds

force_bloom_filters

force_bushy_joins

force_heuristic_rewrites

force_table_pushdown

foreign_key_checks

forward_aggregator_plan_hash

general_log_file

geo_query_info

group_concat_max_len

hash_groupby_segment_distinct_values_threshold

have_openssl

have_query_cache

have_ssl

heartbeat_max_connection_saturation_timeout_ms

heartbeat_minimum_query_per_sec

heartbeat_period_ms

heartbeat_ping_failure_timeout_s

heartbeats_failed_before_node_failure

heartbeats_failed_before_reconnect

http_api_close_connection_on_user_drop

idle_thread_lifetime_seconds

ignore_builtin_innodb

ignore_insert_into_computed_column

init_connect

init_memsql_db_only

inlist_precision_limit

innodb_buffer_pool_size

innodb_strict_mode

insecure_accept_any_password_for_all_users

interactive_timeout

This variable exists for backwards compatibility with MySQL and is non-operational in SingleStore.

internal_allow_leaf_alters

internal_allow_systable_queries

internal_autostats_refresh_enabled

internal_cluster_replication_provision_timeout_retries

internal_columnstore_idle_flush_wait_seconds

internal_columnstore_ingest_aggressive_throttle_ms

internal_columnstore_max_uncompressed_blob_size

internal_columnstore_validate_blob_after_write

internal_columnstore_validate_blob_before_read

internal_columnstore_window_minimum_blob_size

internal_drop_all_from_plancache_legacy_behavior

internal_dump_bitcode_file

internal_dump_clean_bitcode_file

internal_dump_raw_bitcode_file

internal_enable_parallel_query_throttling

internal_extra_sync_replication_logging

internal_info_schema_show_hidden_tables

internal_keepalive_count

internal_keepalive_timeout

internal_llvm_compile_externally

internal_llvm_detect_cpu_features

internal_master_flush

internal_max_cte_depth

internal_minimum_local_size_for_llvm_lifetimes

internal_send_prehandshake_packet

internal_session_tracelogs_limit

internal_set_keepalive_on_connections

internal_set_user_timeout_on_connections

internal_slave_flush

internal_specialize_common_opcodes

internal_trace_compile_args

interp_first_auto_gen_helper

interpreter_mode_sampling_threshold

join_buffer_size

json_agg_max_len

lc_messages

This variable exists for backwards compatibility with MySQL and is non-operational in SingleStore.

lc_time_names

This variable exists for backwards compatibility with MySQL and is non-operational in SingleStore.

leaf_pushdown_default

leaf_pushdown_enable_rowcount

license

license_visibility

llvm_diagnostic_info

local_file_system_access_restricted

local_infile

This variable exists for backwards compatibility with MySQL and is non-operational in SingleStore.

lock_logging_min_latency

lock_upgrade

locked_in_memory

This variable exists for backwards compatibility with MySQL and is non-operational in SingleStore.

log_error

log_error_verbosity

log_output

log_queries_not_using_indexes

log_warnings

lower_case_table_names

materialize_ctes

max_broadcast_tree_rowcount

max_complex_type_elim_rowcount

max_connect_errors

max_error_count

max_heap_table_size

max_join_size

max_length_for_sort_data

max_recursive_cte_iterations

max_seeks_for_key

max_sort_length

max_subselect_aggregator_rowcount

max_user_connections

This variable exists for backwards compatibility with MySQL and is non-operational in SingleStore.

max_xact_cache_size_aggs

max_xact_cache_size_leaves

mbcc_phase_times

memsql_custom_build

memsql_license

minimum_core_count

minimum_memory_mb

ml_model

multi_range_count

multistatement_transactions

This variable is deprecated and its value is ignored started in version 8.5.

net_retry_count

This variable exists for backwards compatibility with MySQL and is non-operational in SingleStore.

num_workers_background_tasks_pool

old

old_local_join_optimizer

old_passwords

openssl_version

optimize_constants

optimize_expressions_larger_than

optimize_huge_expressions

optimize_mpl_before_printing

optimize_scopes

optimize_stmt_threshold

optimizer_beam_width

optimizer_cross_join_cost

optimizer_disable_operator_tree_nullability_check

optimizer_disable_right_join

optimizer_disable_subselect_to_join

optimizer_empty_tables_limit

optimizer_enable_json_text_matching

optimizer_hash_join_cost

optimizer_latest

optimizer_merge_join_cost

optimizer_nested_join_cost

optimizer_num_partitions

optimizer_prune_level

optimizer_search_depth

optimizer_switch

optimizer_warnings

password_expiration_seconds

password_history_count

pipelines_extractor_get_offsets_timeout_ms

pipelines_extractor_idle_timeout_ms

plancachedir

port_open_timeout

pre_handshake_packet_wait_period_ms

preload_buffer_size

preserve_original_colstore_json

profile_for_debug

`proxy_user

This variable exists for backwards compatibility with MySQL and is non-operational in SingleStore.

quadratic_rewrite_size_limit

query_alloc_block_size

query_cache_size

query_cache_type

query_prealloc_size

query_rewrite_loop_iterations

read_buffer_size

read_only

recovery_batch_size

ref_repl_mgmt_threads

repartition_minimum_buffer_size

repl_mgmt_threads

replication_sync

This variable has been deprecated and is no longer operational in SingleStore.

replication_timeout_ms

report_mpl_optimizations

reported_hostname

reshuffle_group_by_base_cost

rewrite_verbose

row_lock_conflict_forces_implicit_rollback

rows_per_period

sampling_estimates_for_complex_filters

secure_auth

secure_mode

session_lock

set_global_variables_allowed_list

singlebox_optimizer_cost_based_threshold

skip_blob_crc_checks

skip_create_database_resource_check

skip_host_cache

skip_networking

skip_rebalance_blob_cache_warmup

skip_rebalance_resource_check

skip_show_database

slow_launch_time

sql_auto_is_null

sql_mode

sql_notes

sql_safe_updates

ssl_key_passphrase

statistics_warnings

strict_mode

strict_passwords

subquery_merge_with_outer_joins

sync2_timeout

sync_binlog

synchronize_bottomless_timeout_ms

synchronize_database_timeout

syslog_level

syslog_level_CONSENSUS

syslog_level_CSI

syslog_level_CS_QE

syslog_level_LOAD_DATA_INTERNAL_COMPRESSION

syslog_level_MCTE

syslog_level_METADATA

syslog_level_NETWORK

syslog_level_PARAMETRIZER

syslog_level_REPL

syslog_level_SEND_ERROR

syslog_level_SPARSE_COMPRESSION

syslog_level_TRANSACTIONS

syslog_level_WASM

syslog_location

syslog_protocol

target_replica_blob_cache_size_ratio

time_format

This variable exists for backwards compatibility with MySQL and is non-operational in SingleStore.

tmp_table_size

tmpdir

tracelog_level

tracelog_level_CONSENSUS

tracelog_level_CSI

tracelog_level_CS_QE

tracelog_level_LOAD_DATA_INTERNAL_COMPRESSION

tracelog_level_MCTE

tracelog_level_METADATA

tracelog_level_NETWORK

tracelog_level_PARAMETRIZER

tracelog_level_REPL

tracelog_level_SEND_ERROR

tracelog_level_SPARSE_COMPRESSION

tracelog_level_TRANSACTIONS

tracelog_level_WASM

tracelogsdir

track_leaked_memory

transaction_read_only

This variable exists for backwards compatibility with MySQL and is non-operational in SingleStore.

tx_read_only

This variable exists for backwards compatibility with MySQL and is non-operational in SingleStore.

udf_gc_expiry

udf_gc_interval

unique_checks

upgrade_skip_sync_repl_step

use_avx2

use_bind_address_for_outgoing

use_joincolumnstore

use_joincolumnstore_bailout

use_joincolumnstore_hash

use_joincolumnstore_trace

use_memfd_create

use_popcnt_instruction

use_seekable_json

v3_license_path

verify_column_compression

verify_fields_in_transitivity

version

This variable exists for backwards compatibility with MySQL and is non-operational in SingleStore. To check the version of SingleStore you are running, use the memsql_version variable instead.

version_comment

This variable exists for backwards compatibility with MySQL and is non-operational in SingleStore.

wait_die_queue_max_length

wait_die_retry_on_die_sleep_factor

wait_die_retry_until_timeout_on_die

wait_timeout

This variable exists for backwards compatibility with MySQL and is non-operational in SingleStore.

warning_count

This variable exists for backwards compatibility with MySQL and is non-operational in SingleStore.

Last modified: February 14, 2024

Was this article helpful?