Help Center/ Data Admin Service/ API Reference/ APIs/ Intelligent O&M/ Querying InnoDB Lock Waits
Updated on 2026-08-25 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

    Dependencies

    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

Definition

Project ID of a tenant in a region

To obtain this value, see Obtaining a Project ID.

Constraints

N/A

Range

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

Default Value

N/A

instance_id

Yes

String

Definition

Unique ID of an instance. You can obtain the instance ID from the instance list or instance details.

Constraints

N/A

Range

The value can contain 36 characters. Only letters and digits are allowed.

Default Value

N/A
Table 2 Query parameters

Parameter

Mandatory

Type

Description

db_user_id

Yes

String

Definition

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 Creating a Database User.

Constraints

N/A

Range

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

Definition

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

innodb_lock_waits

Array of InnodbLockWaits objects

Definition

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

count

Integer

Definition

Number of transactions that currently hold or wait for locks

Range

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

Parameter

Type

Description

trx_id

String

Definition

Transaction ID

Range

N/A

trx_state

String

Definition

Transaction status

Range

  • RUNNING
  • LOCK WAIT
  • ROLLING BACK
  • COMMITTING

trx_started

String

Definition

Time when a transaction was started

Range

N/A

trx_wait_started

String

Definition

Transaction ID

Range

N/A

trx_mysql_thread_id

String

Definition

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

Range

N/A

trx_query

String

Definition

SQL statement executed by a transaction

Range

N/A

trx_tables_locked

String

Definition

Number of tables with row locks

Range

N/A

trx_rows_locked

String

Definition

Number of locked rows (approximate value)

Range

N/A

trx_rows_modified

String

Definition

Number of rows inserted or modified by a transaction

Range

N/A

trx_isolation_level

String

Definition

Isolation level

Range

N/A

innodb_wait_locks

Array of InnodbLock objects

Definition

Information about lock waits

innodb_hold_locks

Array of InnodbLock objects

Definition

Information about held locks
Table 5 InnodbLock

Parameter

Type

Description

lock_id

String

Definition

Lock ID

Range

N/A

lock_trx_id

String

Definition

Transaction ID

Range

N/A

lock_mode

String

Definition

Lock mode

Range

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

lock_type

String

Definition

Lock type

Range

  • RECORD: row lock
  • TABLE: table lock

lock_table

String

Definition

Locked table

Range

N/A

lock_index

String

Definition

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

Range

N/A

lock_space

String

Definition

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

Range

N/A

lock_page

String

Definition

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

Range

N/A

lock_rec

String

Definition

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

Range

N/A

lock_data

String

Definition

Primary key locked by a transaction. If lock_type is set to TABLE, null is returned.

Range

N/A
Table 6 InnodbLockWaits

Parameter

Type

Description

requesting_trx_id

String

Definition

ID of a transaction that requests the lock

Range

N/A

requested_lock_id

String

Definition

ID of a requested lock

Range

N/A

blocking_trx_id

String

Definition

ID of a blocked transaction

Range

N/A

blocking_lock_id

String

Definition

ID of a blocked lock

Range

N/A

Example Requests

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 Codes

Status Code

Description

200

Success.

400

Bad request.

500

Internal server error.

Error Codes

See Error Codes.

Parent topic: Intelligent O&M