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TDSQL for MySQL
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    DescribeDBParameters

    Last updated: 2020-12-01 20:37:52
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    1. API Description

    Domain name for API request: dcdb.tencentcloudapi.com.

    This API is used to get the current parameter settings of a database.

    A maximum of 20 requests can be initiated per second for this API.

    Note: This API supports Finance regions. If the common parameter Region is a Finance region, a domain name with the Finance region needs to be specified, for example: dcdb.ap-shanghai-fsi.tencentcloudapi.com

    We recommend you to use API Explorer
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    2. Input Parameters

    The following request parameter list only provides API request parameters and some common parameters. For the complete common parameter list, see Common Request Parameters.

    Parameter Name Required Type Description
    Action Yes String Common parameter. The value used for this API: DescribeDBParameters.
    Version Yes String Common parameter. The value used for this API: 2018-04-11.
    Region Yes String Common parameter. For more information, please see the list of regions supported by the product.
    InstanceId Yes String Instance ID in the format of dcdbt-ow7t8lmc.

    3. Output Parameters

    Parameter Name Type Description
    InstanceId String Instance ID in the format of dcdbt-ow7t8lmc.
    Params Array of ParamDesc Requests the current parameter values of a DB
    RequestId String The unique request ID, which is returned for each request. RequestId is required for locating a problem.

    4. Example

    Example1 Getting the current parameters of a database

    Input Example

    https://dcdb.tencentcloudapi.com/?Action=DescribeDBParameters
&InstanceId=dcdbt-ige1a5k3
&<Common request parameters>

    Output Example

    {
  "Response": {
    "InstanceId": "dcdbt-ige1a5k3",
    "Params": [
      {
        "Default": "1",
        "SetValue": "",
        "Value": "1",
        "Param": "auto_increment_increment",
        "Constraint": {
          "Range": {
            "Max": "65535",
            "Min": "1"
          },
          "Type": "section"
        }
      },
      {
        "Default": "1",
        "SetValue": "",
        "Value": "1",
        "Param": "auto_increment_offset",
        "Constraint": {
          "Range": {
            "Max": "65535",
            "Min": "1"
          },
          "Type": "section"
        }
      },
      {
        "Default": "ON",
        "SetValue": "",
        "Value": "ON",
        "Param": "autocommit",
        "Constraint": {
          "Enum": "ON,OFF",
          "Type": "enum"
        }
      },
      {
        "Default": "ROW",
        "SetValue": "",
        "Value": "ROW",
        "Param": "binlog_format",
        "Constraint": {
          "Enum": "ROW,STATEMENT,MIXED",
          "Type": "enum"
        }
      },
      {
        "Default": "utf8",
        "SetValue": "",
        "Value": "utf8",
        "Param": "character_set_server",
        "Constraint": {
          "Enum": "utf8,latin1,gbk,utf8mb4",
          "Type": "enum"
        }
      },
      {
        "Default": "",
        "SetValue": "",
        "Value": "utf8_general_ci",
        "Param": "collation_server",
        "Constraint": {
          "Enum": "latin1_general_cs,latin1_general_ci,latin1_bin,latin1_swedish_ci,gbk_chinese_ci,gbk_bin,utf8_general_ci,utf8_bin,utf8_unicode_ci,utf8mb4_general_ci,utf8mb4_bin,utf8mb4_unicode_ci",
          "Type": "enum"
        }
      },
      {
        "Default": "10",
        "SetValue": "",
        "Value": "10",
        "Param": "connect_timeout",
        "Constraint": {
          "Range": {
            "Max": "3600",
            "Min": "1"
          },
          "Type": "section"
        }
      },
      {
        "Default": "0",
        "SetValue": "",
        "Value": "0",
        "Param": "default_week_format",
        "Constraint": {
          "Range": {
            "Max": "7",
            "Min": "0"
          },
          "Type": "section"
        }
      },
      {
        "Default": "ON",
        "SetValue": "",
        "Value": "ON",
        "Param": "delay_key_write",
        "Constraint": {
          "Enum": "ON,OFF,ALL",
          "Type": "enum"
        }
      },
      {
        "Default": "100",
        "SetValue": "",
        "Value": "100",
        "Param": "delayed_insert_limit",
        "Constraint": {
          "Range": {
            "Max": "4294967295",
            "Min": "1"
          },
          "Type": "section"
        }
      },
      {
        "Default": "300",
        "SetValue": "",
        "Value": "300",
        "Param": "delayed_insert_timeout",
        "Constraint": {
          "Range": {
            "Max": "3600",
            "Min": "1"
          },
          "Type": "section"
        }
      },
      {
        "Default": "1000",
        "SetValue": "",
        "Value": "1000",
        "Param": "delayed_queue_size",
        "Constraint": {
          "Range": {
            "Max": "4294967295",
            "Min": "1"
          },
          "Type": "section"
        }
      },
      {
        "Default": "4",
        "SetValue": "",
        "Value": "4",
        "Param": "div_precision_increment",
        "Constraint": {
          "Range": {
            "Max": "30",
            "Min": "0"
          },
          "Type": "section"
        }
      },
      {
        "Default": "OFF",
        "SetValue": "",
        "Value": "OFF",
        "Param": "event_scheduler",
        "Constraint": {
          "Enum": "ON,OFF",
          "Type": "enum"
        }
      },
      {
        "Default": "1024",
        "SetValue": "",
        "Value": "1024",
        "Param": "group_concat_max_len",
        "Constraint": {
          "Range": {
            "Max": "18446744073709547520",
            "Min": "4"
          },
          "Type": "section"
        }
      },
      {
        "Default": "5000",
        "SetValue": "",
        "Value": "5000",
        "Param": "innodb_concurrency_tickets",
        "Constraint": {
          "Range": {
            "Max": "10000",
            "Min": "100"
          },
          "Type": "section"
        }
      },
      {
        "Default": "OFF",
        "SetValue": "",
        "Value": "ON",
        "Param": "innodb_large_prefix",
        "Constraint": {
          "Enum": "OFF,ON",
          "Type": "enum"
        }
      },
      {
        "Default": "50",
        "SetValue": "",
        "Value": "20",
        "Param": "innodb_lock_wait_timeout",
        "Constraint": {
          "Range": {
            "Max": "1073741824",
            "Min": "1"
          },
          "Type": "section"
        }
      },
      {
        "Default": "10",
        "SetValue": "",
        "Value": "70.000000",
        "Param": "innodb_max_dirty_pages_pct",
        "Constraint": {
          "Range": {
            "Max": "90",
            "Min": "10"
          },
          "Type": "section"
        }
      },
      {
        "Default": "37",
        "SetValue": "",
        "Value": "37",
        "Param": "innodb_old_blocks_pct",
        "Constraint": {
          "Range": {
            "Max": "95",
            "Min": "5"
          },
          "Type": "section"
        }
      },
      {
        "Default": "1000",
        "SetValue": "",
        "Value": "1000",
        "Param": "innodb_old_blocks_time",
        "Constraint": {
          "Range": {
            "Max": "1000",
            "Min": "0"
          },
          "Type": "section"
        }
      },
      {
        "Default": "4096",
        "SetValue": "",
        "Value": "16384",
        "Param": "innodb_page_size",
        "Constraint": {
          "Enum": "4096,8192,16384,32768,65536",
          "Type": "enum"
        }
      },
      {
        "Default": "300",
        "SetValue": "",
        "Value": "1000",
        "Param": "innodb_purge_batch_size",
        "Constraint": {
          "Range": {
            "Max": "1024",
            "Min": "1"
          },
          "Type": "section"
        }
      },
      {
        "Default": "56",
        "SetValue": "",
        "Value": "56",
        "Param": "innodb_read_ahead_threshold",
        "Constraint": {
          "Range": {
            "Max": "64",
            "Min": "0"
          },
          "Type": "section"
        }
      },
      {
        "Default": "nulls_equal",
        "SetValue": "",
        "Value": "nulls_equal",
        "Param": "innodb_stats_method",
        "Constraint": {
          "Enum": "nulls_equal,nulls_unequal,nulls_ignored",
          "Type": "enum"
        }
      },
      {
        "Default": "OFF",
        "SetValue": "",
        "Value": "OFF",
        "Param": "innodb_stats_on_metadata",
        "Constraint": {
          "Enum": "ON,OFF",
          "Type": "enum"
        }
      },
      {
        "Default": "8",
        "SetValue": "",
        "Value": "8",
        "Param": "innodb_stats_sample_pages",
        "Constraint": {
          "Range": {
            "Max": "4294967296",
            "Min": "1"
          },
          "Type": "section"
        }
      },
      {
        "Default": "OFF",
        "SetValue": "",
        "Value": "OFF",
        "Param": "innodb_strict_mode",
        "Constraint": {
          "Enum": "ON,OFF",
          "Type": "enum"
        }
      },
      {
        "Default": "ON",
        "SetValue": "",
        "Value": "ON",
        "Param": "innodb_table_locks",
        "Constraint": {
          "Enum": "ON,OFF",
          "Type": "enum"
        }
      },
      {
        "Default": "0",
        "SetValue": "",
        "Value": "64",
        "Param": "innodb_thread_concurrency",
        "Constraint": {
          "Range": {
            "Max": "128",
            "Min": "0"
          },
          "Type": "section"
        }
      },
      {
        "Default": "10000",
        "SetValue": "",
        "Value": "0",
        "Param": "innodb_thread_sleep_delay",
        "Constraint": {
          "Range": {
            "Max": "3600000",
            "Min": "1"
          },
          "Type": "section"
        }
      },
      {
        "Default": "28800",
        "SetValue": "",
        "Value": "28800",
        "Param": "interactive_timeout",
        "Constraint": {
          "Range": {
            "Max": "86400",
            "Min": "10"
          },
          "Type": "section"
        }
      },
      {
        "Default": "262144",
        "SetValue": "",
        "Value": "2097152",
        "Param": "join_buffer_size",
        "Constraint": {
          "Range": {
            "Max": "18446744073709547520",
            "Min": "128"
          },
          "Type": "section"
        }
      },
      {
        "Default": "300",
        "SetValue": "",
        "Value": "300",
        "Param": "key_cache_age_threshold",
        "Constraint": {
          "Range": {
            "Max": "4294967295",
            "Min": "100"
          },
          "Type": "section"
        }
      },
      {
        "Default": "1024",
        "SetValue": "",
        "Value": "1024",
        "Param": "key_cache_block_size",
        "Constraint": {
          "Range": {
            "Max": "16384",
            "Min": "512"
          },
          "Type": "section"
        }
      },
      {
        "Default": "100",
        "SetValue": "",
        "Value": "100",
        "Param": "key_cache_division_limit",
        "Constraint": {
          "Range": {
            "Max": "100",
            "Min": "1"
          },
          "Type": "section"
        }
      },
      {
        "Default": "5",
        "SetValue": "",
        "Value": "5",
        "Param": "lock_wait_timeout",
        "Constraint": {
          "Range": {
            "Max": "31536000",
            "Min": "1"
          },
          "Type": "section"
        }
      },
      {
        "Default": "OFF",
        "SetValue": "",
        "Value": "OFF",
        "Param": "log_queries_not_using_indexes",
        "Constraint": {
          "Enum": "ON,OFF",
          "Type": "enum"
        }
      },
      {
        "Default": "1.000000",
        "SetValue": "",
        "Value": "1.000000",
        "Param": "long_query_time",
        "Constraint": {
          "Range": {
            "Max": "10",
            "Min": "0.05"
          },
          "Type": "section"
        }
      },
      {
        "Default": "OFF",
        "SetValue": "",
        "Value": "OFF",
        "Param": "low_priority_updates",
        "Constraint": {
          "Enum": "OFF,ON",
          "Type": "enum"
        }
      },
      {
        "Default": "1",
        "SetValue": "",
        "Value": "0",
        "Param": "lower_case_table_names",
        "Constraint": {
          "Enum": "0,1",
          "Type": "enum"
        }
      },
      {
        "Default": "134217728",
        "SetValue": "",
        "Value": "1073741824",
        "Param": "max_allowed_packet",
        "Constraint": {
          "Range": {
            "Max": "1073741824",
            "Min": "16384"
          },
          "Type": "section"
        }
      },
      {
        "Default": "2000",
        "SetValue": "",
        "Value": "2000",
        "Param": "max_connect_errors",
        "Constraint": {
          "Range": {
            "Max": "4096",
            "Min": "1"
          },
          "Type": "section"
        }
      },
      {
        "Default": "4096",
        "SetValue": "",
        "Value": "10000",
        "Param": "max_connections",
        "Constraint": {
          "Range": {
            "Max": "32768",
            "Min": "1"
          },
          "Type": "section"
        }
      },
      {
        "Default": "16382",
        "SetValue": "",
        "Value": "200000",
        "Param": "max_prepared_stmt_count",
        "Constraint": {
          "Range": {
            "Max": "1048576",
            "Min": "0"
          },
          "Type": "section"
        }
      },
      {
        "Default": "4194304",
        "SetValue": "",
        "Value": "4194304",
        "Param": "myisam_sort_buffer_size",
        "Constraint": {
          "Range": {
            "Max": "16777216",
            "Min": "262144"
          },
          "Type": "section"
        }
      },
      {
        "Default": "16384",
        "SetValue": "",
        "Value": "16384",
        "Param": "net_buffer_length",
        "Constraint": {
          "Enum": "4096,8192,16384,32768,65536,1048576",
          "Type": "enum"
        }
      },
      {
        "Default": "30",
        "SetValue": "",
        "Value": "30",
        "Param": "net_read_timeout",
        "Constraint": {
          "Range": {
            "Max": "3153600",
            "Min": "1"
          },
          "Type": "section"
        }
      },
      {
        "Default": "10",
        "SetValue": "",
        "Value": "10",
        "Param": "net_retry_count",
        "Constraint": {
          "Range": {
            "Max": "4294967295",
            "Min": "1"
          },
          "Type": "section"
        }
      },
      {
        "Default": "60",
        "SetValue": "",
        "Value": "60",
        "Param": "net_write_timeout",
        "Constraint": {
          "Range": {
            "Max": "3153600",
            "Min": "1"
          },
          "Type": "section"
        }
      },
      {
        "Default": "index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,optimize_join_buffer_size=on",
        "SetValue": "",
        "Value": "batched_key_access=off,block_nested_loop=on,condition_fanout_filter=on,derived_merge=on,duplicateweedout=on,engine_condition_pushdown=on,firstmatch=on,index_condition_pushdown=on,index_merge=on,index_merge_intersection=on,index_merge_sort_union=on,index_merge_union=on,loosescan=on,materialization=on,mrr=on,mrr_cost_based=on,semijoin=on,subquery_materialization_cost_based=on,use_index_extensions=on",
        "Param": "optimizer_switch",
        "Constraint": {
          "Type": "string"
        }
      },
      {
        "Default": "8192",
        "SetValue": "",
        "Value": "16384",
        "Param": "query_alloc_block_size",
        "Constraint": {
          "Range": {
            "Max": "16384",
            "Min": "1024"
          },
          "Type": "section"
        }
      },
      {
        "Default": "1048576",
        "SetValue": "",
        "Value": "1048576",
        "Param": "query_cache_limit",
        "Constraint": {
          "Range": {
            "Max": "1048576",
            "Min": "1"
          },
          "Type": "section"
        }
      },
      {
        "Default": "0",
        "SetValue": "",
        "Value": "0",
        "Param": "query_cache_size",
        "Constraint": {
          "Range": {
            "Max": "104857600",
            "Min": "0"
          },
          "Type": "section"
        }
      },
      {
        "Default": "OFF",
        "SetValue": "",
        "Value": "OFF",
        "Param": "query_cache_type",
        "Constraint": {
          "Enum": "OFF,ON,DEMAND",
          "Type": "enum"
        }
      },
      {
        "Default": "8192",
        "SetValue": "",
        "Value": "24576",
        "Param": "query_prealloc_size",
        "Constraint": {
          "Range": {
            "Max": "1048576",
            "Min": "8192"
          },
          "Type": "section"
        }
      },
      {
        "Default": "10",
        "SetValue": "",
        "Value": "",
        "Param": "slave_parallel_threads",
        "Constraint": {
          "Range": {
            "Max": "16383",
            "Min": "0"
          },
          "Type": "section"
        }
      },
      {
        "Default": "2",
        "SetValue": "",
        "Value": "2",
        "Param": "slow_launch_time",
        "Constraint": {
          "Range": {
            "Max": "1024",
            "Min": "1"
          },
          "Type": "section"
        }
      },
      {
        "Default": "2097152",
        "SetValue": "",
        "Value": "2097152",
        "Param": "sort_buffer_size",
        "Constraint": {
          "Range": {
            "Max": "1073741824",
            "Min": "32768"
          },
          "Type": "section"
        }
      },
      {
        "Default": "",
        "SetValue": "",
        "Value": "NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES",
        "Param": "sql_mode",
        "Constraint": {
          "Type": "string"
        }
      },
      {
        "Default": "10",
        "SetValue": "",
        "Value": "30",
        "Param": "sqlasyntimeout",
        "Constraint": {
          "Range": {
            "Max": "100",
            "Min": "10"
          },
          "Type": "section"
        }
      },
      {
        "Default": "400",
        "SetValue": "",
        "Value": "400",
        "Param": "table_definition_cache",
        "Constraint": {
          "Range": {
            "Max": "2048",
            "Min": "400"
          },
          "Type": "section"
        }
      },
      {
        "Default": "1024",
        "SetValue": "",
        "Value": "10240",
        "Param": "table_open_cache",
        "Constraint": {
          "Range": {
            "Max": "524288",
            "Min": "400"
          },
          "Type": "section"
        }
      },
      {
        "Default": "3",
        "SetValue": "",
        "Value": "30",
        "Param": "thread_pool_oversubscribe",
        "Constraint": {
          "Range": {
            "Max": "65536",
            "Min": "1"
          },
          "Type": "section"
        }
      },
      {
        "Default": "33554432",
        "SetValue": "",
        "Value": "33554432",
        "Param": "tmp_table_size",
        "Constraint": {
          "Range": {
            "Max": "67108864",
            "Min": "262144"
          },
          "Type": "section"
        }
      },
      {
        "Default": "REPEATABLE-READ",
        "SetValue": "",
        "Value": "REPEATABLE-READ",
        "Param": "tx_isolation",
        "Constraint": {
          "Enum": "REPEATABLE-READ,SERIALIZABLE,READ-COMMITTED,READ-UNCOMMITTED",
          "Type": "enum"
        }
      },
      {
        "Default": "28800",
        "SetValue": "",
        "Value": "28800",
        "Param": "wait_timeout",
        "Constraint": {
          "Range": {
            "Max": "259200",
            "Min": "60"
          },
          "Type": "section"
        }
      }
    ],
    "RequestId": "affa5c39-02b7-482a-a16f-a74e660e7b7f"
  }
}

    5. Developer Resources

    SDK

    TencentCloud API 3.0 integrates SDKs that support various programming languages to make it easier for you to call APIs.

    Command Line Interface

    6. Error Code

    The following only lists the error codes related to the API business logic. For other error codes, see Common Error Codes.

    Error Code Description
    InternalError.CamAuthFailed CAM authentication request failed.
    InternalError.DbOperationFailed Failed to query the database.
    InternalError.GetDbConfigFailed Failed to get database instance parameters.
    InvalidParameter.GenericParameterError An error occurred while verifying parameter validity.
    ResourceNotFound.NoInstanceFound The specified database instance was not found.
    ResourceUnavailable.InstanceAlreadyDeleted The database instance has been dropped.
    ResourceUnavailable.InstanceStatusAbnormal Incorrect database instance status. Operations are not allowed.
    UnauthorizedOperation.PermissionDenied You have no permission to manipulate this API or resource.
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