MySQL :: MySQL HeatWave on AWS :: 15.9 Session Variables

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15.9 Session Variables

Session variables remain in effect during the session until the variable changes or the session ends. The change has no effect on other sessions. For new connections, a session variable value is initialized with the corresponding global system variable value. Many of the following session variables are also available as user configurable variables. See: User Configurable System Variables.

To assign a value to a session variable, precede the variable name with the SESSION or LOCAL keyword, or with the @@SESSION., @@LOCAL., or @@ qualifier, or with no keyword or modifier. For example:

mysql> SET SESSION sql_mode = 'TRADITIONAL';
mysql> SET LOCAL sql_mode = 'TRADITIONAL';
mysql> SET @@SESSION.sql_mode = 'TRADITIONAL';
mysql> SET @@LOCAL.sql_mode = 'TRADITIONAL';
mysql> SET @@sql_mode = 'TRADITIONAL';
mysql> SET sql_mode = 'TRADITIONAL';

Table 15-19 User Settable Session Variables

Name	Default Value
`autocommit`	`ON`
`big_tables`	`OFF`
`block_encryption_mode`	`aes-128-ecb`
`character_set_client`	`utf8mb4`
`character_set_connection`	`utf8mb4`
`character_set_results`	`utf8mb4`
`character_set_server`	`utf8mb4`
`collation_connection`	`utf8mb4_0900_ai_ci`
`collation_database`	`utf8mb4_0900_ai_ci`
`collation_server`	`utf8mb4_0900_ai_ci`
`completion_type`	`NO_CHAIN`
`cte_max_recursion_depth`	`1000`
`default-storage-engine`	`InnoDB`
`--default_tmp_storage_engine`	`InnoDB`
`default_week_format`	`0`
`div_precision_increment`	`4`
`end_markers_in_json`	`OFF`
`eq_range_index_dive_limit`	`200`
`foreign_key_checks`	`ON`
`generated_random_password_length`	`20`
`group_concat_max_len`	`1024`
`group_replication_consistency`	`BEFORE_ON_PRIMARY_FAILOVER`
`information_schema_stats_expiry`	`86400`
`innodb_ddl_buffer_size`	`1048576`
`innodb_ddl_threads`	`4`
`innodb_ft_enable_stopword`	`ON`
`innodb_ft_user_stopword_table`	`NULL`
`innodb_lock_wait_timeout`	`50`
`innodb_parallel_read_threads`	Shape dependent. See Shape Dependent System Variables.
`internal_tmp_mem_storage_engine`	`TempTable`
`join_buffer_size`	`262144`
`lc_messages`	`en_US`
`lc_time_names`	`en_US`
`lock_wait_timeout`	`86400`
`long_query_time`	`10`
`max_allowed_packet`	`67108864`
`max_execution_time`	`0`
`max_heap_table_size`	`16777216`
`max_join_size`	`18446744073709551615`
`max_length_for_sort_data`	`4096`
`max_points_in_geometry`	`65536`
`max_seeks_for_key`	`18446744073709551615`
`max_sort_length`	`1024`
`mysqlx_max_allowed_packet`	`67108864`
`mysqlx_read_timeout`	`30`
`mysqlx_wait_timeout`	`28800`
`mysqlx_write_timeout`	`60`
`net_buffer_length`	`16384`
`net_read_timeout`	`30`
`net_retry_count`	`10`
`net_write_timeout`	`60`
`new`	`OFF`
`old_alter_table`	`OFF`
`optimizer_prune_level`	`1`
`optimizer_search_depth`	`62`
`optimizer_switch`	index_merge_sort_union=on, index_merge_intersection=on, engine_condition_pushdown=on, index_condition_pushdown=on, mrr=on, mrr_cost_based=on, block_nested_loop=on, batched_key_access=off, materialization=on, semijoin=on, loosescan=on, firstmatch=on, duplicateweedout=on, subquery_materialization_cost_based=on, use_index_extensions=on, condition_fanout_filter=on, derived_merge=on, use_invisible_indexes=off, skip_scan=on, hash_join=on, subquery_to_derived=off, prefer_ordering_index=on, hypergraph_optimizer=off, derived_condition_pushdown=on
`optimizer_trace`	`enabled=off,one_line=off`
`optimizer_trace_features`	`greedy_search=on, range_optimizer=on, dynamic_range=on, repeated_subselect=on`
`optimizer_trace_limit`	`1`
`optimizer_trace_max_mem_size`	`1048576`
`optimizer_trace_offset`	`-1`
`parser_max_mem_size`	`18446744073709551615`
`print_identified_with_as_hex`	`OFF`
`pseudo_replica_mode`	`OFF`
`pseudo_slave_mode`	`OFF`
`query_alloc_block_size`	`8192`
`query_prealloc_size`	`8192`
`range_alloc_block_size`	`4096`
`range_optimizer_max_mem_size`	`8388608`
`rbr_exec_mode`	`STRICT`
`read_buffer_size`	`131072`
`read_rnd_buffer_size`	`262144`
`resultset_metadata`	`FULL`
`secondary_engine_cost_threshold`	`100000.000000`
`session_track_gtids`	`OFF`
`session_track_schema`	`ON`
`session_track_state_change`	`OFF`
`session_track_system_variables`	`262144`
`session_track_transaction_info`	`OFF`
`show_create_table_skip_secondary_engine`	`OFF`
`show_create_table_verbosity`	`OFF`
`sort_buffer_size`	`262144`
`sql_auto_is_null`	`OFF`
`sql_big_selects`	`ON`
`sql_buffer_result`	`OFF`
`sql_mode`	`ONLY_FULL_GROUP_BY, STRICT_TRANS_TABLES, NO_ZERO_IN_DATE, NO_ZERO_DATE, ERROR_FOR_DIVISION_BY_ZERO, NO_ENGINE_SUBSTITUTION`
`sql_notes`	`ON`
`sql_quote_show_create`	`ON`
`sql_safe_updates`	`OFF`
`sql_select_limit`	`18446744073709551615`
`sql_warnings`	`OFF`
`thread_pool_high_priority_connection`	`0`
`time_zone`	`UTC`
`tmp_table_size`	`16777216`
`transaction_alloc_block_size`	`8192`
`transaction_isolation`	`REPEATABLE-READ`
`transaction_prealloc_size`	`4096`
`transaction_read_only`	`OFF`
`unique_checks`	`ON`
`updatable_views_with_limit`	`YES`
`use_secondary_engine`	`ON`
`wait_timeout`	`28800`
`windowing_use_high_precision`	`ON`

Parent topic: Configuration

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