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SHOW [GLOBAL|SESSION] VARIABLES

This statement shows a list of variables for the scope of either GLOBAL or SESSION. If no scope is specified, the default scope of SESSION will apply.

Synopsis

ShowStmt:

ShowStmt

ShowTargetFilterable:

ShowTargetFilterable

GlobalScope:

GlobalScope

Examples

mysql> SHOW GLOBAL VARIABLES LIKE 'tidb%'; +------------------------------------+---------------+ | Variable_name | Value | +------------------------------------+---------------+ | tidb_current_ts | 0 | | tidb_wait_split_region_timeout | 300 | | tidb_query_log_max_len | 2048 | | tidb_mem_quota_indexlookupjoin | 34359738368 | | tidb_index_join_batch_size | 25000 | | tidb_index_lookup_concurrency | 4 | | tidb_hash_join_concurrency | 5 | | tidb_mem_quota_mergejoin | 34359738368 | | tidb_checksum_table_concurrency | 4 | | tidb_projection_concurrency | 4 | | tidb_ddl_reorg_priority | PRIORITY_LOW | | tidb_batch_delete | 0 | | tidb_batch_insert | 0 | | tidb_optimizer_selectivity_level | 0 | | tidb_backoff_lock_fast | 100 | | tidb_enable_streaming | 0 | | tidb_config | | | tidb_retry_limit | 10 | | tidb_force_priority | NO_PRIORITY | | tidb_ddl_reorg_worker_cnt | 16 | | tidb_index_serial_scan_concurrency | 1 | | tidb_index_lookup_join_concurrency | 4 | | tidb_constraint_check_in_place | 0 | | tidb_scatter_region | 0 | | tidb_mem_quota_topn | 34359738368 | | tidb_check_mb4_value_in_utf8 | 1 | | tidb_hashagg_partial_concurrency | 4 | | tidb_index_lookup_size | 20000 | | tidb_max_chunk_size | 1024 | | tidb_disable_txn_auto_retry | 1 | | tidb_build_stats_concurrency | 4 | | tidb_auto_analyze_ratio | 0.5 | | tidb_general_log | 0 | | tidb_ddl_reorg_batch_size | 1024 | | tidb_wait_split_region_finish | 1 | | tidb_skip_utf8_check | 0 | | tidb_opt_agg_push_down | 0 | | tidb_auto_analyze_start_time | 00:00 +0000 | | tidb_distsql_scan_concurrency | 15 | | tidb_mem_quota_sort | 34359738368 | | tidb_opt_write_row_id | 0 | | tidb_enable_table_partition | 0 | | tidb_auto_analyze_end_time | 23:59 +0000 | | tidb_mem_quota_nestedloopapply | 34359738368 | | tidb_hashagg_final_concurrency | 4 | | tidb_slow_log_threshold | 300 | | tidb_mem_quota_query | 34359738368 | | tidb_snapshot | | | tidb_dml_batch_size | 20000 | | tidb_slow_query_file | tidb-slow.log | | tidb_opt_insubquery_unfold | 0 | | tidb_mem_quota_indexlookupreader | 34359738368 | | tidb_mem_quota_hashjoin | 34359738368 | +------------------------------------+---------------+ 53 rows in set (0.01 sec) mysql> SHOW GLOBAL VARIABLES LIKE 'time_zone%'; +---------------+--------+ | Variable_name | Value | +---------------+--------+ | time_zone | SYSTEM | +---------------+--------+ 1 row in set (0.00 sec)

MySQL compatibility

This statement is understood to be fully compatible with MySQL. Any compatibility differences should be reported via an issue on GitHub.

See also

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