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Querying InnoDB Lock Waits
Function
Query InnoDB lock waits. Currently, this function is supported only for MySQL DB instances.
URI
GET /v3/{project_id}/instances/{instance_id}/innodb-locks
Parameter |
Mandatory |
Type |
Description |
---|---|---|---|
project_id |
Yes |
String |
Project ID. To obtain this value, see Obtaining a Project ID. |
instance_id |
Yes |
String |
Instance ID. |
Parameter |
Mandatory |
Type |
Description |
---|---|---|---|
db_user_id |
Yes |
String |
Database user ID |
Request Parameters
Parameter |
Mandatory |
Type |
Description |
---|---|---|---|
X-Auth-Token |
Yes |
String |
User token. |
X-Language |
No |
String |
Language. The value can be:
|
Response Parameters
Status code: 200
Parameter |
Type |
Description |
---|---|---|
innodb_trx |
Array of InnodbTrx objects |
Information about the transaction that holds or waits for a lock. |
innodb_lock_waits |
Array of InnodbLockWaits objects |
Mapping between the lock requested by each transaction and the lock that blocks the request. |
count |
Integer |
Number of transactions that hold or wait for a lock. |
Parameter |
Type |
Description |
---|---|---|
trx_id |
String |
Transaction ID. |
trx_state |
String |
Transaction status. |
trx_started |
String |
Time when the transaction was started. |
trx_wait_started |
String |
Time when the transaction wait was started. |
trx_mysql_thread_id |
String |
Session ID, same as the ID returned by the ListProcesses API. |
trx_query |
String |
SQL statement executed by the transaction. |
trx_tables_locked |
String |
Number of tables with row locks. |
trx_rows_locked |
String |
Number of rows locked (approximate). |
trx_rows_modified |
String |
Number of rows inserted or modified by the transaction. |
trx_isolation_level |
String |
Isolation level. |
innodb_wait_locks |
Array of InnodbLock objects |
Lock waits |
innodb_hold_locks |
Array of InnodbLock objects |
Held locks. |
Parameter |
Type |
Description |
---|---|---|
lock_id |
String |
Lock ID. |
lock_trx_id |
String |
Transaction ID. |
lock_mode |
String |
Lock mode. The value can be S[,GAP], X[,GAP], IS[,GAP], IX[,GAP], AUTO_INC, or UNKNOWN. |
lock_type |
String |
Lock type. The value can be RECORD or TABLE. RECORD indicates a row lock and TABLE indicates a table lock. |
lock_table |
String |
Name of the table that has been locked or contains locked records. |
lock_index |
String |
Index that has been locked if lock_type is RECORD. If lock_type is Table, null if returned. |
lock_space |
String |
Index that has been locked if lock_type is RECORD. If lock_type is Table, null if returned. |
lock_page |
String |
Page number of the locked record if lock_type is RECORD. If lock_type is Table, null if returned. |
lock_rec |
String |
Heap number of the locked record if lock_type is RECORD. If lock_type is Table, null if returned. |
lock_data |
String |
Primary key locked by the transaction. If lock_type is Table, null if returned. |
Parameter |
Type |
Description |
---|---|---|
requesting_trx_id |
String |
ID of the transaction that requests the lock. |
requested_lock_id |
String |
ID of the lock requested. |
blocking_trx_id |
String |
ID of the blocking transaction. |
blocking_lock_id |
String |
ID of the blocking lock. |
Status code: 400
Parameter |
Type |
Description |
---|---|---|
error_code |
String |
Error code. Minimum length: 8 Maximum length: 36 |
error_msg |
String |
Error message. Minimum length: 2 Maximum length: 512 |
Status code: 500
Parameter |
Type |
Description |
---|---|---|
error_code |
String |
Error code. Minimum length: 8 Maximum length: 36 |
error_msg |
String |
Error message. Minimum length: 2 Maximum length: 512 |
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 Code
Status Code |
Description |
---|---|
200 |
Success. |
400 |
Bad request. |
500 |
Internal server error. |
Error Code
For details, see Error Codes.
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