Upgrade Process

This section describes the process for upgrade from an earlier version to the target version.

Figure 1 Upgrade flowchart

NOTE: The time required for each procedure is an estimate and for reference only.

Table 1 Estimated time required for each procedure

Procedure	Recommended Start Time	Required Time	Service Interruption Duration	Remarks
Preparing for and Checking the Upgrade	One day before the upgrade	About two to three hours.	No impact on services.	Check and back up data and verify software packages before the upgrade.
Perform the upgrade.	Service idle hours	The time is mainly spent in starting and stopping the database and modifying the system catalog of each database. Generally, the upgrade takes no more than 30 minutes.	The duration is the same as the operation duration. Generally, the duration does not exceed 30 minutes.	Start the upgrade according to the upgrade guide.
Verify the upgrade.	Service idle hours	About 30 minutes.	The duration is the same as the operation duration, which is about 30 minutes.	-
Committing the Upgrade Task	Service idle hours	The upgrade commit takes no more than 10 minutes.	The duration is the same as the operation duration. Generally, the duration does not exceed 10 minutes.	-
Rolling Back the Upgrade Version	Service idle hours	Generally, the version rollback takes no more than 30 minutes.	The duration is the same as the operation duration. Generally, the duration does not exceed 30 minutes.	-