Upgrading a Minor Version

Scenarios

TaurusDB supports manual minor version upgrades, which can improve performance, add new functions, and fix bugs.

Precautions

• The upgrade will cause the instance to reboot and briefly interrupt services. To limit the impact of the upgrade, perform the upgrade during off-peak hours, or ensure that your applications support automatic reconnection.
• If a DB instance contains a large number of table partitions (more than 1 million), it may take more than 2 hours to reboot the instance.
• If the primary node and read replicas of a DB instance are deployed in the same AZ, a minor version upgrade will trigger a failover. If they are in different AZs, a minor version upgrade will trigger two failovers. A failover means that the system fails over to a read replica in case the primary node is unavailable.
• When you upgrade a minor version of a DB instance, minor versions of read replicas (if any) will also be upgraded automatically. Minor versions of read replicas cannot be upgraded separately. A minor version upgrade cannot be rolled back after the upgrade is complete.
• DDL operations, such as creating events, dropping events, and altering events, are not allowed during a minor version upgrade.
• If the replication latency between the primary node and read replicas is longer than 300 seconds, the minor version cannot be upgraded.
• To upgrade the kernel version to 2.0.54.240600 or later, ensure that the value of rds_global_sql_log_bin is ON and the value of binlog_expire_logs_seconds is at least 86400. For details about how to set these parameters, see Modifying Parameters of a TaurusDB Instance.

Procedure

1. Log in to the management console.
2. Click in the upper left corner and select a region and project.
3. Click in the upper left corner of the page, choose Database > TaurusDB.
4. On the Instances page, click the instance name to go to the Basic Information page.
5. In the DB Instance Information area, click Upgrade next to DB Engine Version.

   Alternatively, go to the Instances page and click Upgrade in the DB Engine Version column.

6. In the displayed dialog box, select a scheduled time and click OK.