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, including only letters and digits. Default Value N/A
instance_id	Yes	String	Definition Unique ID of an instance Constraints N/A Range The value can contain 32 characters, including only letters and digits. 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 Range N/A
innodb_lock_waits	Array of InnodbLockWaits objects	Definition Mapping between the lock requested by each transaction and the lock that blocks the request Range N/A
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 Range N/A
innodb_hold_locks	Array of InnodbLock objects	Definition Information about held locks Range N/A

**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 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
}