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Querying Metadata Locks

Updated on 2025-02-05 GMT+08:00

Function

Query metadata locks. Currently, only MySQL instances are supported.

URI

GET /v3/{project_id}/instances/{instance_id}/metadata-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:

Only MySQL instances are supported.

Values:

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

Default value:

N/A

Table 2 Query parameters

Parameter

Mandatory

Type

Description

db_user_id

Yes

String

Explanation:

Database user ID

Constraints:

N/A

Values:

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

Default value:

N/A

thread_id

No

String

Explanation:

Session ID

Constraints:

N/A

Values:

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

Default value:

N/A

database

No

String

Explanation:

Database name

Constraints:

Only MySQL instances are supported.

Values:

N/A

Default value:

N/A

table

No

String

Explanation:

Table name

Constraints:

Only MySQL instance tables are supported.

Values:

N/A

Default value:

N/A

Request Parameters

None

Response Parameters

Status code: 200

Table 3 Response body parameters

Parameter

Type

Description

metadata_locks

Array of MetadataLock objects

Explanation:

List of metadata locks.

Values:

N/A

count

Integer

Explanation:

Number of metadata locks.

Values:

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

Table 4 MetadataLock

Parameter

Type

Description

thread_id

String

Explanation:

Session ID

Values:

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

lock_status

String

Explanation:

Lock status

Values:

  • PENDING: A lock wait occurs.
  • GRANTED: A lock is held.

lock_mode

String

Explanation:

Lock mode

Values:

  • MDL_SHARED
  • MDL_EXCLUSIVE
  • MDL_SHARED_READ
  • MDL_SHARED_WRITE

lock_type

String

Explanation:

Lock type

Values:

  • Table metadata lock
  • Schema metadata lock
  • Tablespace lock
  • Global read lock

lock_duration

String

Explanation:

Lock granularity

Values:

  • MDL_STATEMENT: statement level
  • MDL_TRANSACTION: transaction level
  • MDL_EXPLICIT: global level

table_schema

String

Explanation:

Database where a lock is located. This field is left blank for some global read metadata locks.

Values:

N/A

table_name

String

Explanation:

Table name

Values:

N/A

user

String

Explanation:

User

Values:

N/A

time

String

Explanation:

Time

Values:

N/A

host

String

Explanation:

Host

Values:

N/A

database

String

Explanation:

Database where a session is located

Values:

N/A

command

String

Explanation:

Command

Values:

N/A

state

String

Explanation:

Status

Values:

N/A

sql

String

Explanation:

SQL statement

Values:

N/A

trx_exec_time

String

Explanation:

Transaction execution time

Values:

N/A

block_process

Array of Process objects

Explanation:

List of blocked sessions

Values:

N/A

wait_process

Array of Process objects

Explanation:

List of waiting sessions

Values:

N/A

Table 5 Process

Parameter

Type

Description

id

String

Explanation:

Session ID

Values:

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

user

String

Explanation:

User

Values:

N/A

host

String

Explanation:

Host

Values:

N/A

database

String

Explanation:

Database

Values:

N/A

command

String

Explanation:

Command

Values:

N/A

time

String

Explanation:

Session duration

Values:

N/A

state

String

Explanation:

Status

Values:

N/A

sql

String

Explanation:

SQL statement

Values:

N/A

trx_executed_time

String

Explanation:

Transaction duration

Values:

N/A

Example Request

Querying metadata locks

GET https://das.cn-north-1.myhuaweicloud.com/v3/054e292c9880d4992f02c0196d3ea468/instances/da304cd5bbb944de828759bc7be3d3fein01/metadata-locks?db_user_id=2c250598-1e3c-4d31-bc19-be1d866247e6&thread_id=12121&database=example&table=example

Example Response

Status code: 200

{
  "metadata_locks" : [ {
    "thread_id" : "4096619",
    "lock_status" : "GRANTED",
    "lock_mode" : "MDL_SHARED_READ",
    "lock_type" : "Table metadata lock",
    "lock_duration" : "MDL_TRANSACTION",
    "table_schema" : "test_zyr",
    "table_name" : "test2",
    "user" : "root",
    "time" : "40",
    "host" : "das server",
    "database" : "test_zyr",
    "command" : "Sleep",
    "state" : "",
    "sql" : null,
    "trx_exec_time" : "341",
    "block_process" : [ ],
    "wait_process" : [ ]
  } ],
  "count" : 1
}

Status Codes

Status Code

Description

200

Success.

400

Bad request.

500

Internal server error.

Error Codes

See Error Codes.

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