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Update TiDB Serverless limitations (#13970)
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,249 @@ | ||
| --- | ||
| title: Limited SQL Features on TiDB Cloud | ||
| summary: Learn about the limited SQL features on TiDB Cloud. | ||
| --- | ||
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| # Limited SQL features on TiDB Cloud | ||
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| TiDB Cloud works with almost all workloads that TiDB supports, but there are some feature differences between TiDB Self-Hosted and TiDB Dedicated/Serverless. This document describes the limitations of SQL features on TiDB Cloud. We are constantly filling in the feature gaps between TiDB Self-Hosted and TiDB Dedicated/Serverless. If you require these features or capabilities in the gap, [contact us](/tidb-cloud/tidb-cloud-support.md) for a feature request. | ||
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| ## Statements | ||
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| ### Placement and range management | ||
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| | Statement | TiDB Dedicated | TiDB Serverless | | ||
| |:-|:-|:-| | ||
| | `ALTER PLACEMENT POLICY` | Supported | Not supported [^1] | | ||
| | `CREATE PLACEMENT POLICY` | Supported | Not supported [^1] | | ||
| | `DROP PLACEMENT POLICY` | Supported | Not supported [^1] | | ||
| | `SHOW CREATE PLACEMENT POLICY` | Supported | Not supported [^1] | | ||
| | `SHOW PLACEMENT` | Supported | Not supported [^1] | | ||
| | `SHOW PLACEMENT FOR` | Supported | Not supported [^1] | | ||
| | `SHOW PLACEMENT LABELS` | Supported | Not supported [^1] | | ||
| | `SHOW TABLE REGIONS` | Supported | Not supported [^1] | | ||
| | `SPLIT REGION` | Supported | Not supported [^1] | | ||
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| ### Resource groups | ||
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| | Statement | TiDB Dedicated | TiDB Serverless | | ||
| |:-|:-|:-| | ||
| | `ALTER RESOURCE GROUP` | Supported | Not supported [^2] | | ||
| | `CALIBRATE RESOURCE` | Supported | Not supported [^2] | | ||
| | `CREATE RESOURCE GROUP` | Supported | Not supported [^2] | | ||
| | `DROP RESOURCE GROUP` | Supported | Not supported [^2] | | ||
| | `SET RESOURCE GROUP` | Supported | Not supported [^2] | | ||
| | `SHOW CREATE RESOURCE GROUP` | Supported | Not supported [^2] | | ||
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| ### Others | ||
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| | Statement | TiDB Dedicated | TiDB Serverless | | ||
| |:-|:-|:-| | ||
| | `BACKUP` | Supported | Not supported [^3] | | ||
| | `SHOW BACKUPS` | Supported | Not supported [^3] | | ||
| | `RESTORE` | Supported | Not supported [^3] | | ||
| | `SHOW RESTORES` | Supported | Not supported [^3] | | ||
| | `ADMIN RESET TELEMETRY_ID` | Supported | Telemetry is not supported on TiDB Serverless. | | ||
| | `ADMIN SHOW TELEMETRY` | Not supported [^4] | Not supported [^4] | | ||
| | `ADMIN SHOW SLOW` | Supported | Not supported [^5] | | ||
| | `ADMIN PLUGINS ENABLE` | Supported | Not supported [^8] | | ||
| | `ADMIN PLUGINS DISABLE` | Supported | Not supported [^8] | | ||
| | `ALTER INSTANCE RELOAD TLS` | Supported | TiDB Serverless automatically refreshes the TLS certificate. | | ||
| | `LOAD DATA INFILE` | Only supports `LOAD DATA LOCAL INFILE` | Only supports `LOAD DATA LOCAL INFILE` | | ||
| | `CHANGE DRAINER` | Not supported [^7] | Not supported [^7] | | ||
| | `CHANGE PUMP` | Not supported [^7] | Not supported [^7] | | ||
| | `FLASHBACK CLUSTER TO TIMESTAMP` | Supported | Not supported [^3] | | ||
| | `LOAD STATS` | Supported | Not supported | | ||
| | `SET CONFIG` | Not supported [^4] | Not supported [^4] | | ||
| | `SHOW CONFIG` | Not supported [^4] | Not supported [^4] | | ||
| | `SHOW DRAINER STATUS` | Not supported [^7] | Not supported [^7] | | ||
| | `SHOW PLUGINS` | Supported | Not supported [^8] | | ||
| | `SHOW PUMP STATUS` | Not supported [^7] | Not supported [^7] | | ||
| | `SHUTDOWN` | Not supported [^4] | Not supported [^4] | | ||
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| ## Functions and operators | ||
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| | Function and operator | TiDB Dedicated | TiDB Serverless | | ||
| |:-|:-|:-| | ||
| | `SLEEP` | No Limitation | The [`SLEEP()` function](https://docs.pingcap.com/tidbcloud/miscellaneous-functions) has a limitation wherein it can only support a maximum sleep time of 300 seconds.| | ||
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| ## System tables | ||
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| | Database | Table | TiDB Dedicated | TiDB Serverless | | ||
| |:-|:-|:-|:-| | ||
| | `information_schema` | `ATTRIBUTES` | Supported | Not supported [^1] | | ||
| | `information_schema` | `CLUSTER_CONFIG` | Not supported [^4] | Not supported [^4] | | ||
| | `information_schema` | `CLUSTER_HARDWARE` | Not supported [^4] | Not supported [^4] | | ||
| | `information_schema` | `CLUSTER_INFO` | Supported | Not supported [^1] | | ||
| | `information_schema` | `CLUSTER_LOAD` | Not supported [^4] | Not supported [^4] | | ||
| | `information_schema` | `CLUSTER_LOG` | Not supported [^4] | Not supported [^4] | | ||
| | `information_schema` | `CLUSTER_SLOW_QUERY` | Supported | Not supported [^5] | | ||
| | `information_schema` | `CLUSTER_STATEMENTS_SUMMARY` | Supported | Not supported [^6] | | ||
| | `information_schema` | `CLUSTER_STATEMENTS_SUMMARY_EVICTED` | Supported | Not supported [^6] | | ||
| | `information_schema` | `CLUSTER_STATEMENTS_SUMMARY_HISTORY` | Supported | Not supported [^6] | | ||
| | `information_schema` | `CLUSTER_SYSTEMINFO` | Not supported [^4] | Not supported [^4] | | ||
| | `information_schema` | `INSPECTION_RESULT` | Not supported [^4] | Not supported [^4] | | ||
| | `information_schema` | `INSPECTION_RULES` | Not supported [^4] | Not supported [^4] | | ||
| | `information_schema` | `INSPECTION_SUMMARY` | Not supported [^4] | Not supported [^4] | | ||
| | `information_schema` | `METRICS_SUMMARY` | Not supported [^4] | Not supported [^4] | | ||
| | `information_schema` | `METRICS_SUMMARY_BY_LABEL` | Not supported [^4] | Not supported [^4] | | ||
| | `information_schema` | `METRICS_TABLES` | Not supported [^4] | Not supported [^4] | | ||
| | `information_schema` | `PLACEMENT_POLICIES` | Supported | Not supported [^1] | | ||
| | `information_schema` | `RESOURCE_GROUPS` | Supported | Not supported [^2] | | ||
| | `information_schema` | `SLOW_QUERY` | Supported | Not supported [^5] | | ||
| | `information_schema` | `STATEMENTS_SUMMARY` | Supported | Not supported [^6] | | ||
| | `information_schema` | `STATEMENTS_SUMMARY_EVICTED` | Supported | Not supported [^6] | | ||
| | `information_schema` | `STATEMENTS_SUMMARY_HISTORY` | Supported | Not supported [^6] | | ||
| | `information_schema` | `TIDB_HOT_REGIONS` | Not supported [^4] | Not supported [^4] | | ||
| | `information_schema` | `TIDB_HOT_REGIONS_HISTORY` | Supported | Not supported [^1] | | ||
| | `information_schema` | `TIDB_SERVERS_INFO` | Supported | Not supported [^1] | | ||
| | `information_schema` | `TIFLASH_SEGMENTS` | Supported | Not supported [^1] | | ||
| | `information_schema` | `TIFLASH_TABLES` | Supported | Not supported [^1] | | ||
| | `information_schema` | `TIKV_REGION_PEERS` | Supported | Not supported [^1] | | ||
| | `information_schema` | `TIKV_REGION_STATUS` | Supported | Not supported [^1] | | ||
| | `information_schema` | `TIKV_STORE_STATUS` | Supported | Not supported [^1] | | ||
| | `performance_schema` | `pd_profile_allocs` | Not supported [^4] | Not supported [^4] | | ||
| | `performance_schema` | `pd_profile_block` | Not supported [^4] | Not supported [^4] | | ||
| | `performance_schema` | `pd_profile_cpu` | Not supported [^4] | Not supported [^4] | | ||
| | `performance_schema` | `pd_profile_goroutines` | Not supported [^4] | Not supported [^4] | | ||
| | `performance_schema` | `pd_profile_memory` | Not supported [^4] | Not supported [^4] | | ||
| | `performance_schema` | `pd_profile_mutex` | Not supported [^4] | Not supported [^4] | | ||
| | `performance_schema` | `tidb_profile_allocs` | Not supported [^4] | Not supported [^4] | | ||
| | `performance_schema` | `tidb_profile_block` | Not supported [^4] | Not supported [^4] | | ||
| | `performance_schema` | `tidb_profile_cpu` | Not supported [^4] | Not supported [^4] | | ||
| | `performance_schema` | `tidb_profile_goroutines` | Not supported [^4] | Not supported [^4] | | ||
| | `performance_schema` | `tidb_profile_memory` | Not supported [^4] | Not supported [^4] | | ||
| | `performance_schema` | `tidb_profile_mutex` | Not supported [^4] | Not supported [^4] | | ||
| | `performance_schema` | `tikv_profile_cpu` | Not supported [^4] | Not supported [^4] | | ||
| | `mysql` | `expr_pushdown_blacklist` | Not supported [^4] | Not supported [^4] | | ||
| | `mysql` | `gc_delete_range` | Not supported [^4] | Not supported [^4] | | ||
| | `mysql` | `gc_delete_range_done` | Not supported [^4] | Not supported [^4] | | ||
| | `mysql` | `opt_rule_blacklist` | Not supported [^4] | Not supported [^4] | | ||
| | `mysql` | `tidb` | Not supported [^4] | Not supported [^4] | | ||
| | `mysql` | `tidb_ttl_job_history` | Supported | Not supported [^9] | | ||
| | `mysql` | `tidb_ttl_table_status` | Supported | Not supported [^9] | | ||
| | `mysql` | `tidb_ttl_task` | Supported | Not supported [^9] | | ||
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| ## System variables | ||
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| | Variable | TiDB Dedicated | TiDB Serverless | | ||
| |:-|:-|:-| | ||
| | `datadir` | No limitation | Not supported [^1] | | ||
| | `interactive_timeout` | No limitation | Read-only [^11] | | ||
| | `max_allowed_packet` | No limitation | Read-only [^11] | | ||
| | `plugin_dir` | No limitation | Not supported [^8] | | ||
| | `plugin_load` | No limitation | Not supported [^8] | | ||
| | `skip_name_resolve` | No limitation | Read-only [^11] | | ||
| | `sql_log_bin` | No limitation | Read-only [^11] | | ||
| | `tidb_cdc_write_source` | No limitation | Read-only [^11] | | ||
| | `tidb_check_mb4_value_in_utf8` | Not supported [^4] | Not supported [^4] | | ||
| | `tidb_config` | Not supported [^4] | Not supported [^4] | | ||
| | `tidb_ddl_disk_quota` | No limitation | Read-only [^11] | | ||
| | `tidb_ddl_enable_fast_reorg` | No limitation | Read-only [^11] | | ||
| | `tidb_ddl_error_count_limit` | No limitation | Read-only [^11] | | ||
| | `tidb_ddl_flashback_concurrency` | No limitation | Read-only [^11] | | ||
| | `tidb_ddl_reorg_batch_size` | No limitation | Read-only [^11] | | ||
| | `tidb_ddl_reorg_priority` | No limitation | Read-only [^11] | | ||
| | `tidb_ddl_reorg_worker_cnt` | No limitation | Read-only [^11] | | ||
| | `tidb_enable_1pc` | No limitation | Read-only [^11] | | ||
| | `tidb_enable_async_commit` | No limitation | Read-only [^11] | | ||
| | `tidb_enable_auto_analyze` | No limitation | Read-only [^11] | | ||
| | `tidb_enable_collect_execution_info` | Not supported [^4] | Not supported [^4] | | ||
| | `tidb_enable_ddl` | No limitation | Read-only [^11] | | ||
| | `tidb_enable_gc_aware_memory_track` | No limitation | Read-only [^11] | | ||
| | `tidb_enable_gogc_tuner` | No limitation | Read-only [^11] | | ||
| | `tidb_enable_local_txn` | No limitation | Read-only [^11] | | ||
| | `tidb_enable_resource_control` | No limitation | Read-only [^11] | | ||
| | `tidb_enable_slow_log` | Not supported [^4] | Not supported [^4] | | ||
| | `tidb_enable_stmt_summary` | No limitation | Read-only [^11] | | ||
| | `tidb_enable_telemetry` | Not supported [^4] | Not supported [^4] | | ||
| | `tidb_enable_top_sql` | No limitation | Read-only [^11] | | ||
| | `tidb_enable_tso_follower_proxy` | No limitation | Read-only [^11] | | ||
| | `tidb_expensive_query_time_threshold` | Not supported [^4] | Not supported [^4] | | ||
| | `tidb_force_priority` | Not supported [^4] | Not supported [^4] | | ||
| | `tidb_gc_concurrency` | No limitation | Read-only [^11] | | ||
| | `tidb_gc_enable` | No limitation | Read-only [^11] | | ||
| | `tidb_gc_life_time` | No limitation | Read-only [^11] | | ||
| | `tidb_gc_max_wait_time` | No limitation | Read-only [^11] | | ||
| | `tidb_gc_run_interval` | No limitation | Read-only [^11] | | ||
| | `tidb_gc_scan_lock_mode` | No limitation | Read-only [^11] | | ||
| | `tidb_general_log` | Not supported [^4] | Not supported [^4] | | ||
| | `tidb_generate_binary_plan` | No limitation | Read-only [^11] | | ||
| | `tidb_gogc_tuner_threshold` | No limitation | Read-only [^11] | | ||
| | `tidb_guarantee_linearizability` | No limitation | Read-only [^11] | | ||
| | `tidb_isolation_read_engines` | No limitation | Read-only [^11] | | ||
| | `tidb_log_file_max_days` | No limitation | Read-only [^11] | | ||
| | `tidb_memory_usage_alarm_ratio` | Not supported [^4] | Not supported [^4] | | ||
| | `tidb_metric_query_range_duration` | Not supported [^4] | Not supported [^4] | | ||
| | `tidb_metric_query_step` | Not supported [^4] | Not supported [^4] | | ||
| | `tidb_opt_write_row_id` | Not supported [^4] | Not supported [^4] | | ||
| | `tidb_placement_mode` | No limitation | Read-only [^11] | | ||
| | `tidb_pprof_sql_cpu` | Not supported [^4] | Not supported [^4] | | ||
| | `tidb_record_plan_in_slow_log` | Not supported [^4] | Not supported [^4] | | ||
| | `tidb_redact_log` | Not supported [^4] | Not supported [^4] | | ||
| | `tidb_restricted_read_only` | Not supported [^4] | Not supported [^4] | | ||
| | `tidb_row_format_version` | Not supported [^4] | Not supported [^4] | | ||
| | `tidb_scatter_region` | No limitation | Read-only [^11] | | ||
| | `tidb_server_memory_limit` | No limitation | Read-only [^11] | | ||
| | `tidb_server_memory_limit_gc_trigger` | No limitation | Read-only [^11] | | ||
| | `tidb_server_memory_limit_sess_min_size` | No limitation | Read-only [^11] | | ||
| | `tidb_simplified_metrics` | No limitation | Read-only [^11] | | ||
| | `tidb_slow_query_file` | Not supported [^4] | Not supported [^4] | | ||
| | `tidb_slow_log_threshold` | Not supported [^4] | Not supported [^4] | | ||
| | `tidb_slow_txn_log_threshold` | Not supported [^4] | Not supported [^4] | | ||
| | `tidb_stats_load_sync_wait` | No limitation | Read-only [^11] | | ||
| | `tidb_stmt_summary_enable_persistent` | No limitation | Read-only [^11] | | ||
| | `tidb_stmt_summary_file_max_backups` | No limitation | Read-only [^11] | | ||
| | `tidb_stmt_summary_file_max_days` | No limitation | Read-only [^11] | | ||
| | `tidb_stmt_summary_file_max_size` | No limitation | Read-only [^11] | | ||
| | `tidb_stmt_summary_filename` | No limitation | Read-only [^11] | | ||
| | `tidb_stmt_summary_history_size` | No limitation | Read-only [^11] | | ||
| | `tidb_stmt_summary_internal_query` | No limitation | Read-only [^11] | | ||
| | `tidb_stmt_summary_max_sql_length` | No limitation | Read-only [^11] | | ||
| | `tidb_stmt_summary_max_stmt_count` | No limitation | Read-only [^11] | | ||
| | `tidb_stmt_summary_refresh_interval` | No limitation | Read-only [^11] | | ||
| | `tidb_sysproc_scan_concurrency` | No limitation | Read-only [^11] | | ||
| | `tidb_top_sql_max_meta_count` | Not supported [^4] | Not supported [^4] | | ||
| | `tidb_top_sql_max_time_series_count` | Not supported [^4] | Not supported [^4] | | ||
| | `tidb_tso_client_batch_max_wait_time` | No limitation | Read-only [^11] | | ||
| | `tidb_ttl_delete_batch_size` | No limitation | Read-only [^9] | | ||
| | `tidb_ttl_delete_rate_limit` | No limitation | Read-only [^9] | | ||
| | `tidb_ttl_delete_worker_count` | No limitation | Read-only [^9] | | ||
| | `tidb_ttl_job_enable` | No limitation | Read-only [^9] | | ||
| | `tidb_ttl_job_schedule_window_end_time` | No limitation | Read-only [^9] | | ||
| | `tidb_ttl_job_schedule_window_start_time` | No limitation | Read-only [^9] | | ||
| | `tidb_ttl_running_tasks` | No limitation | Read-only [^9] | | ||
| | `tidb_ttl_scan_batch_size` | No limitation | Read-only [^9] | | ||
| | `tidb_ttl_scan_worker_count` | No limitation | Read-only [^9] | | ||
| | `tidb_txn_mode` | No limitation | Read-only [^11] | | ||
| | `tidb_wait_split_region_finish` | No limitation | Read-only [^11] | | ||
| | `tidb_wait_split_region_timeout` | No limitation | Read-only [^11] | | ||
| | `txn_scope` | No limitation | Read-only [^11] | | ||
| | `validate_password.enable` | No limitation | Always enabled [^10] | | ||
| | `validate_password.length` | No limitation | At least `8` [^10] | | ||
| | `validate_password.mixed_case_count` | No limitation | At least `1` [^10] | | ||
| | `validate_password.number_count` | No limitation | At least `1` [^10] | | ||
| | `validate_password.policy` | No limitation | Can only be `MEDIUM` or `STRONG` [^10] | | ||
| | `validate_password.special_char_count` | No limitation | At least `1` [^10] | | ||
| | `wait_timeout` | No limitation | Read-only [^11] | | ||
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| [^1]: Configuring data placement is not supported on TiDB Serverless. | ||
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| [^2]: Configuring resource groups is not supported on TiDB Serverless. | ||
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| [^3]: To perform [Back up and Restore](/tidb-cloud/backup-and-restore-serverless.md) operations on TiDB Serverless, you can use the TiDB Cloud console instead. | ||
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| [^4]: The feature is unavailable in [Security Enhanced Mode (SEM)](/system-variables.md#tidb_enable_enhanced_security). | ||
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| [^5]: To track [Slow Query](/tidb-cloud/tune-performance.md#slow-query) on TiDB Serverless, you can use the TiDB Cloud console instead. | ||
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| [^6]: To perform [Statement Analysis](/tidb-cloud/tune-performance.md#statement-analysis) on TiDB Serverless, you can use the TiDB Cloud console instead. | ||
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| [^7]: Drainer and Pump are not supported on TiDB Cloud. | ||
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| [^8]: Plugin is not supported on TiDB Serverless. | ||
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| [^9]: [Time to live (TTL)](/time-to-live.md) is currently unavailable on TiDB Serverless. | ||
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| [^10]: TiDB Serverless enforces strong password policy. | ||
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| [^11]: The variable is read-only on TiDB Serverless. |
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