From e506ee1f7e6a05dfd09438240779ec31d335a910 Mon Sep 17 00:00:00 2001 From: doc-claw-bot Date: Fri, 10 Jul 2026 06:51:01 +0000 Subject: [PATCH] docs: translate #23176 --- .../sql-statement-show-variables.md | 113 ++---------------- 1 file changed, 9 insertions(+), 104 deletions(-) diff --git a/sql-statements/sql-statement-show-variables.md b/sql-statements/sql-statement-show-variables.md index 108c2f66e5c6..d2d9710b7ee8 100644 --- a/sql-statements/sql-statement-show-variables.md +++ b/sql-statements/sql-statement-show-variables.md @@ -20,125 +20,30 @@ ShowLikeOrWhere ::= ## 示例 -查看 TiDB 定义的专用系统变量，关于这些变量的含义参见[系统变量和语法](/system-variables.md)。 +以下示例展示了如何使用 `SHOW [GLOBAL|SESSION] VARIABLES` 语句查看变量名或变量值符合特定模式的变量。关于这些变量的详细说明，参见[系统变量和语法](/system-variables.md)。 {{< copyable "sql" >}} ```sql -SHOW GLOBAL VARIABLES LIKE 'tidb%'; +SHOW GLOBAL VARIABLES LIKE 'tidb_stmt_summary%'; ``` ```sql +-------------------------------------+---------------------+ | Variable_name | Value | +-------------------------------------+---------------------+ -| tidb_allow_batch_cop | 0 | -| tidb_allow_remove_auto_inc | 0 | -| tidb_auto_analyze_end_time | 23:59 +0000 | -| tidb_auto_analyze_ratio | 0.5 | -| tidb_auto_analyze_start_time | 00:00 +0000 | -| tidb_backoff_lock_fast | 100 | -| tidb_backoff_weight | 2 | -| tidb_batch_commit | 0 | -| tidb_batch_delete | 0 | -| tidb_build_stats_concurrency | 4 | -| tidb_capture_plan_baselines | off | -| tidb_check_mb4_value_in_utf8 | 1 | -| tidb_checksum_table_concurrency | 4 | -| tidb_config | | -| tidb_constraint_check_in_place | 0 | -| tidb_current_ts | 0 | -| tidb_ddl_error_count_limit | 512 | -| tidb_ddl_reorg_batch_size | 256 | -| tidb_ddl_reorg_priority | PRIORITY_LOW | -| tidb_ddl_reorg_worker_cnt | 4 | -| tidb_disable_txn_auto_retry | 1 | -| tidb_distsql_scan_concurrency | 15 | -| tidb_dml_batch_size | 20000 | -| tidb_enable_cascades_planner | 0 | -| tidb_enable_chunk_rpc | 1 | -| tidb_enable_collect_execution_info | 1 | -| tidb_enable_index_merge | 0 | -| tidb_enable_noop_functions | 0 | -| tidb_enable_radix_join | 0 | -| tidb_enable_slow_log | 1 | -| tidb_enable_stmt_summary | 1 | -| tidb_enable_table_partition | on | -| tidb_enable_vectorized_expression | 1 | -| tidb_enable_window_function | 1 | -| tidb_evolve_plan_baselines | off | -| tidb_evolve_plan_task_end_time | 23:59 +0000 | -| tidb_evolve_plan_task_max_time | 600 | -| tidb_evolve_plan_task_start_time | 00:00 +0000 | -| tidb_expensive_query_time_threshold | 60 | -| tidb_force_priority | NO_PRIORITY | -| tidb_general_log | 0 | -| tidb_hash_join_concurrency | 5 | -| tidb_hashagg_final_concurrency | 4 | -| tidb_hashagg_partial_concurrency | 4 | -| tidb_index_join_batch_size | 25000 | -| tidb_index_lookup_concurrency | 4 | -| tidb_index_lookup_join_concurrency | 4 | -| tidb_index_lookup_size | 20000 | -| tidb_index_serial_scan_concurrency | 1 | -| tidb_init_chunk_size | 32 | -| tidb_isolation_read_engines | tikv, tiflash, tidb | -| tidb_low_resolution_tso | 0 | -| tidb_max_chunk_size | 1024 | -| tidb_max_delta_schema_count | 1024 | -| tidb_mem_quota_hashjoin | 34359738368 | -| tidb_mem_quota_indexlookupjoin | 34359738368 | -| tidb_mem_quota_indexlookupreader | 34359738368 | -| tidb_mem_quota_mergejoin | 34359738368 | -| tidb_mem_quota_nestedloopapply | 34359738368 | -| tidb_mem_quota_query | 1073741824 | -| tidb_mem_quota_sort | 34359738368 | -| tidb_mem_quota_topn | 34359738368 | -| tidb_metric_query_range_duration | 60 | -| tidb_metric_query_step | 60 | -| tidb_opt_agg_push_down | 0 | -| tidb_opt_concurrency_factor | 3 | -| tidb_opt_copcpu_factor | 3 | -| tidb_opt_correlation_exp_factor | 1 | -| tidb_opt_correlation_threshold | 0.9 | -| tidb_opt_cpu_factor | 3 | -| tidb_opt_desc_factor | 3 | -| tidb_opt_disk_factor | 1.5 | -| tidb_opt_distinct_agg_push_down | 0 | -| tidb_opt_insubq_to_join_and_agg | 1 | -| tidb_opt_join_reorder_threshold | 0 | -| tidb_opt_memory_factor | 0.001 | -| tidb_opt_network_factor | 1 | -| tidb_opt_scan_factor | 1.5 | -| tidb_opt_seek_factor | 20 | -| tidb_opt_write_row_id | 0 | -| tidb_optimizer_selectivity_level | 0 | -| tidb_pprof_sql_cpu | 0 | -| tidb_projection_concurrency | 4 | -| tidb_query_log_max_len | 4096 | -| tidb_record_plan_in_slow_log | 1 | -| tidb_replica_read | leader | -| tidb_retry_limit | 10 | -| tidb_row_format_version | 2 | -| tidb_scatter_region | | -| tidb_skip_isolation_level_check | 0 | -| tidb_skip_utf8_check | 0 | -| tidb_slow_log_threshold | 300 | -| tidb_slow_query_file | tidb-slow.log | -| tidb_snapshot | | +| tidb_stmt_summary_enable_persistent | OFF | +| tidb_stmt_summary_file_max_backups | 0 | +| tidb_stmt_summary_file_max_days | 3 | +| tidb_stmt_summary_file_max_size | 64 | +| tidb_stmt_summary_filename | tidb-statements.log | | tidb_stmt_summary_history_size | 24 | -| tidb_stmt_summary_internal_query | 0 | +| tidb_stmt_summary_internal_query | OFF | | tidb_stmt_summary_max_sql_length | 4096 | | tidb_stmt_summary_max_stmt_count | 3000 | | tidb_stmt_summary_refresh_interval | 1800 | -| tidb_store_limit | 0 | -| tidb_txn_mode | | -| tidb_use_plan_baselines | on | -| tidb_wait_split_region_finish | 1 | -| tidb_wait_split_region_timeout | 300 | -| tidb_window_concurrency | 4 | +-------------------------------------+---------------------+ -108 rows in set (0.01 sec) +10 rows in set (0.001 sec) ``` {{< copyable "sql" >}}