For more information about these codes, see the MySQL server error message reference.ĭisplays the IO thread error message, if any.ĭisplays the SQL thread error code, if any. You can check the upper limit size by querying SHOW GLOBAL VARIABLES like relay_log_space_limit.ĭisplays the IO thread error code, if any. Indicates the total combined size of all existing relay log files. If there's latency, then this position sequence should be smaller than Read_Master_Log_Pos. Indicates the position of the Relay_Master_Log_File that the replica is applying. If the value is NO, then the replication is likely broken. Indicates whether the SQL thread is running. Indicates whether the IO thread is running. Represents the binary log file that the replica server is reading from the source server. Indicates where the source server is writing in the binary log file. Represents the binary log file to which the source server is writing. Make sure the source server is running, or check to see whether a firewall is blocking the connection. A status such as "Connecting to master" indicates that the replica lost the connection to the source server. Normally, the status is "Waiting for master to send event" if the source (master) server is synchronizing. Represents the current status of the IO thread. Normally, you need to focus on only the rows that the following table describes. The output contains numerous information. In the same Cloud Shell terminal, run the following command: mysql> SHOW SLAVE STATUS Type '\c' to clear the current input statement. Other names may be trademarks of their respective Oracle is a registered trademark of Oracle Corporation and/or itsĪffiliates. Server version: 5.6.42.0 Source distributionĬopyright (c) 2000, 2020, Oracle and/or its affiliates. Type "help" to learn about Cloud -h .com -u -p Here's how the experience looks in the Cloud Shell terminal: Requesting a Cloud Shell.Succeeded. The admin username requires for Azure Database for MySQL. In your code, replace the example values with your replica server name and admin username. To understand the cause of increased replication latency, connect to the replica server by using MySQL Workbench or Azure Cloud Shell. It's calculated by the seconds_behind_master metric that's available in MySQL. This metric is available only on read replica servers.
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In this article, you learn how to troubleshoot replication latency in Azure Database for MySQL. Queries running on the source server and secondary server.Compute tier of the source server and secondary read replica server.
Transaction volume on the source server.These factors include but aren't limited to: The replication lag on the secondary read replicas depends several factors. For more information, see MySQL binlog file position-based replication configuration overview. Replicas are updated asynchronously by using the MySQL engine's native binary log (binlog) file position-based replication technology. It also improves overall performance and latency of the application as it scales. This setup reduces the pressure on the source server. You can scale out workloads by routing read and reporting queries from the application to replica servers. The read replica feature allows you to replicate data from an Azure Database for MySQL server to a read-only replica server. Note: ensure to redact or obfuscate all confidential or identifying information (eg.This article references the term slave, which Microsoft no longer uses. News, articles and tools covering Amazon Web Services (AWS), including S3, EC2, SQS, RDS, DynamoDB, IAM, CloudFormation, AWS-CDK, Route 53, CloudFront, Lambda, VPC, Cloudwatch, Glacier and more.
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