Querying Lock Wait Sessions
Function
This API is used to query lock wait sessions by node ID and session ID. Before calling this API:
- Learn how to authenticate it.
- Obtain the required region and endpoint.
Calling Method
For details, see Calling APIs.
Authorization Information
Each account has all the permissions required to call all APIs, but IAM users must be assigned the required permissions.
- If you are using role/policy-based authorization, see Permissions and Supported Actions for details on the required permissions.
- If you are using identity policy-based authorization, the following identity policy-based permissions are required.
URI
GET /v3/{project_id}/instances/{instance_id}/nodes/{node_id}/process/lock-wait
| 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 contains 32 characters. Only letters and digits are allowed. Default Value N/A |
| instance_id | Yes | String | Definition Instance ID, which uniquely identifies an instance. To obtain this value, see Querying DB Instances. Constraints N/A Range The value contains 36 characters with a suffix of in07. Only letters and digits are allowed. Default Value N/A |
| node_id | Yes | String | Definition Node ID. To obtain this value, see Querying Details of a DB Instance. Constraints N/A Range The value contains 36 characters. Only letters and digits are allowed. Default Value N/A |
| Parameter | Mandatory | Type | Description |
|---|---|---|---|
| pid | Yes | Long | Definition Process ID of the session. To obtain this value, see Querying User Session Threads on a Node. Constraints The value cannot be left blank. Range The value must be a positive integer. Default Value N/A |
Request Parameters
| Parameter | Mandatory | Type | Description |
|---|---|---|---|
| X-Auth-Token | Yes | String | Definition User token. To obtain this value, call the IAM API for obtaining a user token. The value of X-Subject-Token in the response header is the token value. Constraints N/A Range N/A Default Value N/A |
| X-Language | No | String | Definition Request language type. Constraints N/A Range Default Value en-us |
Response Parameters
Status code: 200
| Parameter | Type | Description |
|---|---|---|
| abnormal_root_cause | AbnormalRootCause object | Definition Root cause information, including root cause analysis for lock waits or long-running transactions. |
| Parameter | Type | Description |
|---|---|---|
| abnormal_type | String | Definition Exception type. Range LOCK_WAIT: lock wait |
| lock_root_cause | LockRootCause object | Definition Lock root cause information. |
| Parameter | Type | Description |
|---|---|---|
| locked_pid | Long | Definition ID of the locked session. Range N/A |
| locked_sql | String | Definition SQL statement being executed by the locked session. Range N/A |
| wait_seconds | Long | Definition Wait duration, in seconds. Range N/A |
| lock_db | String | Definition Database where the lock is located. Range N/A |
| lock_table | String | Definition Table where the lock is located. Range N/A |
| lock_index | String | Definition Index where the lock is located. Range N/A |
| lock_mode | String | Definition Lock mode. Range |
| lock_data | String | Definition Identifier of the locked data row. Range N/A |
| blocker_pid | Integer | Definition Blocking session ID. Range N/A |
| blocker_state | String | Definition Blocking transaction status. Range |
| blocker_age | Long | Definition Blocking transaction duration, in seconds. Range N/A |
| blocker_rows_locked | Long | Definition Number of rows locked by the blocking session. Range N/A |
| blocker_rows_modified | Long | Definition Number of rows modified by the blocking session. Range N/A |
| blocker_current_sql | Array of strings | Definition List of SQL statements being executed by the blocking session. |
| blocker_host | String | Definition Blocking host. Range N/A |
| blocker_command | String | Definition Blocking command. Range N/A |
| blocker_thread_id | Long | Definition Blocking thread ID. Range N/A |
Status code: 400
| Parameter | Type | Description |
|---|---|---|
| error_code | String | Error code. |
| error_msg | String | Error message. |
Example Request
Querying lock wait sessions
GET https://{endpoint}/v3/4879de6859e345c780f1a22d8bc6f229/instances/889e005a27254666813a78dba117c0b2in07/nodes/889e005a27254666813a78dba117c0b2no01/process/lock-wait?pid=483563 Example Response
Status code: 200
Success.
{
"abnormal_root_cause" : {
"abnormal_type" : "LOCK_WAIT",
"lock_root_cause" : {
"locked_pid" : 483563,
"locked_sql" : "UPDATE t_lock_test SET val = 'leaf' WHERE id = 2",
"wait_seconds" : 20,
"lock_db" : "test",
"lock_table" : "table1",
"lock_index" : "30",
"lock_data" : "12",
"lock_mode" : "X,REC_NOT_GAP",
"blocker_state" : "LOCK WAIT",
"blocker_age" : 300,
"blocker_rows_locked" : 20,
"blocker_host" : "192.168.1.100:54321",
"blocker_command" : "Sleep",
"blocker_thread_id" : 20,
"blocker_pid" : 4834469,
"blocker_rows_modified" : 1,
"blocker_current_sql" : [ "UPDATE t_lock_test SET val = 'middle' WHERE id = 3" ]
}
}
} SDK Sample Code
The SDK sample code is as follows.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 | package com.huaweicloud.sdk.test; import com.huaweicloud.sdk.core.auth.ICredential; import com.huaweicloud.sdk.core.auth.BasicCredentials; import com.huaweicloud.sdk.core.exception.ConnectionException; import com.huaweicloud.sdk.core.exception.RequestTimeoutException; import com.huaweicloud.sdk.core.exception.ServiceResponseException; import com.huaweicloud.sdk.gaussdb.v3.region.GaussDBRegion; import com.huaweicloud.sdk.gaussdb.v3.*; import com.huaweicloud.sdk.gaussdb.v3.model.*; public class ShowLockWaitSessionSolution { public static void main(String[] args) { // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security. // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment String ak = System.getenv("CLOUD_SDK_AK"); String sk = System.getenv("CLOUD_SDK_SK"); String projectId = "{project_id}"; ICredential auth = new BasicCredentials() .withProjectId(projectId) .withAk(ak) .withSk(sk); GaussDBClient client = GaussDBClient.newBuilder() .withCredential(auth) .withRegion(GaussDBRegion.valueOf("<YOUR REGION>")) .build(); ShowLockWaitSessionRequest request = new ShowLockWaitSessionRequest(); request.withInstanceId("{instance_id}"); request.withNodeId("{node_id}"); try { ShowLockWaitSessionResponse response = client.showLockWaitSession(request); System.out.println(response.toString()); } catch (ConnectionException e) { e.printStackTrace(); } catch (RequestTimeoutException e) { e.printStackTrace(); } catch (ServiceResponseException e) { e.printStackTrace(); System.out.println(e.getHttpStatusCode()); System.out.println(e.getRequestId()); System.out.println(e.getErrorCode()); System.out.println(e.getErrorMsg()); } } } |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | # coding: utf-8 import os from huaweicloudsdkcore.auth.credentials import BasicCredentials from huaweicloudsdkgaussdb.v3.region.gaussdb_region import GaussDBRegion from huaweicloudsdkcore.exceptions import exceptions from huaweicloudsdkgaussdb.v3 import * if __name__ == "__main__": # The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security. # In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment ak = os.environ["CLOUD_SDK_AK"] sk = os.environ["CLOUD_SDK_SK"] projectId = "{project_id}" credentials = BasicCredentials(ak, sk, projectId) client = GaussDBClient.new_builder() \ .with_credentials(credentials) \ .with_region(GaussDBRegion.value_of("<YOUR REGION>")) \ .build() try: request = ShowLockWaitSessionRequest() request.instance_id = "{instance_id}" request.node_id = "{node_id}" response = client.show_lock_wait_session(request) print(response) except exceptions.ClientRequestException as e: print(e.status_code) print(e.request_id) print(e.error_code) print(e.error_msg) |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 | package main import ( "fmt" "github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic" gaussdb "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/gaussdb/v3" "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/gaussdb/v3/model" region "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/gaussdb/v3/region" ) func main() { // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security. // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment ak := os.Getenv("CLOUD_SDK_AK") sk := os.Getenv("CLOUD_SDK_SK") projectId := "{project_id}" auth, err := basic.NewCredentialsBuilder(). WithAk(ak). WithSk(sk). WithProjectId(projectId). SafeBuild() if err != nil { fmt.Println(err) return } hcClient, err := gaussdb.GaussDBClientBuilder(). WithRegion(region.ValueOf("<YOUR REGION>")). WithCredential(auth). SafeBuild() if err != nil { fmt.Println(err) return } client := gaussdb.NewGaussDBClient(hcClient) request := &model.ShowLockWaitSessionRequest{} request.InstanceId = "{instance_id}" request.NodeId = "{node_id}" response, err := client.ShowLockWaitSession(request) if err == nil { fmt.Printf("%+v\n", response) } else { fmt.Println(err) } } |
For SDK sample code of more programming languages, see the Sample Code tab in API Explorer. SDK sample code can be automatically generated.
Status Code
For details, see Status Codes.
Error Code
For details, see Error Codes.
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