Help Center/ Data Admin Service/ API Reference/ APIs (in OBT)/ Intelligent O&M/ Querying InnoDB Lock Waits
Updated on 2025-11-26 GMT+08:00
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Querying InnoDB Lock Waits

Function

Query InnoDB lock waits. Currently, this function is supported only for MySQL DB instances.

Authorization Information

Each account has permissions to call all APIs, but IAM users must have the required permissions specifically assigned.

  • If you are using role/policy-based authorization, see the required permissions in Permissions Policies and Supported Actions.
  • If you are using identity policy-based authorization, the following identity policy-based permissions are required.

    Action

    Access Level

    Resource Type (*: Required)

    Condition Key

    Alias

    Dependency

    das:clouddba:listInnodbLock

    list

    Instance

    -

    -

    -

URI

GET /v3/{project_id}/instances/{instance_id}/innodb-locks

Table 1 URI parameters

Parameter

Mandatory

Type

Description

project_id

Yes

String

Explanation:

Project ID of a tenant in a region

To obtain this value, see Obtaining a Project ID.

Constraints:

N/A

Values:

The value can contain 32 characters. Only letters and digits are allowed.

Default value:

N/A

instance_id

Yes

String

Explanation:

Unique ID of an instance

Constraints:

N/A

Values:

The value can contain 32 characters. Only letters and digits are allowed.

Default value:

N/A
Table 2 Query parameter

Parameter

Mandatory

Type

Description

db_user_id

Yes

String

Explanation:

Database user ID, that is, ID of a connection established between the database account and the database. A database user ID is created by calling the API in Registering a Database User.

Constraints:

N/A

Values:

The value is a UUID containing 36 characters. Only letters, digits, and hyphens (-) are allowed.

Default value:

N/A

Request Parameters

None

Response Parameters

Status code: 200

Table 3 Response body parameters

Parameter

Type

Description

innodb_trx

Array of InnodbTrx objects

Explanation:

Information about the current transaction that holds or waits for a lock

Values:

N/A

innodb_lock_waits

Array of InnodbLockWaits objects

Explanation:

Mapping between the lock requested by each transaction and the lock that blocks the request

Values:

N/A

count

Integer

Explanation:

Number of transactions that currently hold or wait for locks

Values:

[0, 2^31-1]. The actual value depends on the query result.
Table 4 InnodbTrx

Parameter

Type

Description

trx_id

String

Explanation:

Transaction ID

Values:

N/A

trx_state

String

Explanation:

Transaction status

Values:

N/A

trx_started

String

Explanation:

Time when a transaction was started

Values:

N/A

trx_wait_started

String

Explanation:

Transaction ID

Values:

N/A

trx_mysql_thread_id

String

Explanation:

Session ID, same as the ID returned by the ListProcesses API

Values:

N/A

trx_query

String

Explanation:

SQL statement executed by a transaction

Values:

N/A

trx_tables_locked

String

Explanation:

Number of tables with row locks

Values:

N/A

trx_rows_locked

String

Explanation:

Number of locked rows (approximate value)

Values:

N/A

trx_rows_modified

String

Explanation:

Number of rows inserted or modified by a transaction

Values:

N/A

trx_isolation_level

String

Explanation:

Isolation level

Values:

N/A

innodb_wait_locks

Array of InnodbLock objects

Explanation:

Information about lock waits

Values:

N/A

innodb_hold_locks

Array of InnodbLock objects

Explanation:

Information about held locks

Values:

N/A
Table 5 InnodbLock

Parameter

Type

Description

lock_id

String

Explanation:

Lock ID

Values:

N/A

lock_trx_id

String

Explanation:

Transaction ID

Values:

N/A

lock_mode

String

Explanation:

Lock mode

Values:

  • S[,GAP]
  • X[,GAP]
  • IS[,GAP]
  • IX[,GAP]
  • AUTO_INC
  • UNKNOWN

lock_type

String

Explanation:

Lock type

Values:

  • RECORD: row lock
  • TABLE: table lock

lock_table

String

Explanation:

Locked table

Values:

N/A

lock_index

String

Explanation:

Index that has been locked if lock_type is RECORD. If lock_type is Table, null is returned.

Values:

N/A

lock_space

String

Explanation:

Index that has been locked if lock_type is RECORD. If lock_type is Table, null is returned.

Values:

N/A

lock_page

String

Explanation:

Page number of the locked record if lock_type is RECORD. If lock_type is Table, null is returned.

Values:

N/A

lock_rec

String

Explanation:

Heap number of the locked record if lock_type is RECORD. If lock_type is Table, null is returned.

Values:

N/A

lock_data

String

Explanation:

Primary key locked by a transaction. If lock_type is Table, null is returned.

Values:

N/A
Table 6 InnodbLockWaits

Parameter

Type

Description

requesting_trx_id

String

Explanation:

ID of a transaction that requests the lock

Values:

N/A

requested_lock_id

String

Explanation:

ID of a requested lock

Values:

N/A

blocking_trx_id

String

Explanation:

ID of a blocked transaction

Values:

N/A

blocking_lock_id

String

Explanation:

ID of a blocked lock

Values:

N/A

Example Request

Querying InnoDB lock waits

GET https://das.cn-north-1.myhuaweicloud.com/v3/054e292c9880d4992f02c0196d3ea468/instances/da304cd5bbb944de828759bc7be3d3fein01/innodb-locks?db_user_id=2c250598-1e3c-4d31-bc19-be1d866247e6

Example Responses

Status code: 200

{
  "innodb_trx" : [ {
    "trx_id" : "1080883393",
    "trx_state" : "LOCK WAIT",
    "trx_started" : "2021-01-14 18:49:26",
    "trx_wait_started" : "2021-01-14 18:49:26",
    "trx_mysql_thread_id" : "115602",
    "trx_query" : "DELETE FROM adfasdf WHERE  id =1",
    "trx_tables_locked" : "1",
    "trx_rows_locked" : "1",
    "trx_rows_modified" : "0",
    "trx_isolation_level" : "REPEATABLE READ",
    "innodb_wait_locks" : [ {
      "lock_id" : "1080883393:27750:3:2",
      "lock_trx_id" : "1080883393",
      "lock_mode" : "X",
      "lock_type" : "RECORD",
      "lock_table" : "`abc`.`adfasdf`",
      "lock_index" : "GEN_CLUST_INDEX",
      "lock_space" : "27750",
      "lock_page" : "3",
      "lock_rec" : "2",
      "lock_data" : "0x0000005528EC"
    } ],
    "innodb_hold_locks" : [ ]
  }, {
    "trx_id" : "1080882971",
    "trx_state" : "LOCK WAIT",
    "trx_started" : "2021-01-14 18:49:25",
    "trx_wait_started" : "2021-01-14 18:49:25",
    "trx_mysql_thread_id" : "115598",
    "trx_query" : "DELETE FROM adfasdf WHERE  id =1",
    "trx_tables_locked" : "1",
    "trx_rows_locked" : "1",
    "trx_rows_modified" : "0",
    "trx_isolation_level" : "REPEATABLE READ",
    "innodb_wait_locks" : [ ],
    "innodb_hold_locks" : [ {
      "lock_id" : "1080882971:27750:3:2",
      "lock_trx_id" : "1080882971",
      "lock_mode" : "X",
      "lock_type" : "RECORD",
      "lock_table" : "`abc`.`adfasdf`",
      "lock_index" : "GEN_CLUST_INDEX",
      "lock_space" : "27750",
      "lock_page" : "3",
      "lock_rec" : "2",
      "lock_data" : "0x0000005528EC"
    } ]
  } ],
  "innodb_lock_waits" : [ {
    "requesting_trx_id" : "1080883393",
    "requested_lock_id" : "1080883393:27750:3:2",
    "blocking_trx_id" : "1080882971",
    "blocking_lock_id" : "1080882971:27750:3:2"
  } ],
  "count" : 2
}

Status Code

Status Code

Description

200

Successful request

400

Bad request

500

Internal server error

Error Code

For details, see Error Codes.

Parent topic: Intelligent O&M