To ensure the stability of your Hologres instance, Hologres performs scheduled maintenance operations to fix critical bugs and security issues. These operations include instance version upgrades, hardware upgrades, and network upgrades. This topic describes how to set a maintenance window and explains related events.
Precautions
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If you enable automatic minor version upgrades, Hologres upgrades the minor version of your instance during the specified maintenance window. Queries may fail during the upgrade. We recommend setting the maintenance window to off-peak hours to minimize the impact on your business.
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The default maintenance window is
21:00-22:00 (Asia/Shanghai UTC+8). We recommend setting the maintenance window to off-peak hours to minimize the potential impact on your business. -
You cannot configure a separate maintenance window or automatic minor version upgrade policy for read-only secondary instances. They inherit these settings from the primary instance.
Configure O&M event notifications
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When Hologres needs to perform a maintenance event, you are typically notified at least three days in advance. Notifications are sent by text message, voice call, email, internal message, or through the console. For urgent events that address critical risks, notifications may be sent less than three days in advance because the fix must be applied as soon as possible.
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Log on to the Message Center. On the Basic Receiving Management page, ensure that the Product O&M Notification switch is enabled and set the message recipients. Add your Hologres maintenance engineers as recipients. Otherwise, you will not receive notifications.
Modify the maintenance window for a single instance
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Go to the Hologres instance list. In the top menu bar, select a region in the upper-left corner, and then click the ID of the target instance.
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On the Instance Details page, in the Basic Information section, click Settings next to Maintainable Time Window.
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In the Configure Maintainable Time Window dialog box, select a maintenance window and click Settings.
Enable the automatic minor version upgrade policy
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Go to the Hologres instance list. In the top menu bar, select a region in the upper-left corner, and then click the ID of the target instance.
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On the Instance Details page, in the Basic Information section, click the switch next to Minor Version Auto Upgrade.
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In the Enable Minor Version Auto Upgrade dialog box, click Enable.
Disable the automatic minor version upgrade policy
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Go to the Hologres instance list. In the top menu bar, select a region in the upper-left corner, and then click the ID of the target instance.
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On the Instance Details page, in the Basic Information section, click the switch next to Minor Version Auto Upgrade.
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In the Disable Minor Version Auto Upgrade dialog box, click Disable.
Event descriptions
The following table describes the backend operations that may be performed during the maintenance window and their potential impacts.
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Event cause |
Impact type |
Impact description |
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Instance restart |
Brief instance interruption |
During the operation, the following impacts occur:
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Hot upgrade |
Transient instance disconnection |
During the operation, the following impacts occur:
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Differences between minor versions |
The content updated varies between minor versions. Note the differences between the new minor version and the current one. |
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Standard upgrade |
Brief instance interruption |
During the operation, the following impacts occur:
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