Azure SQL Database and Database Maintenance
Once you have created an Azure SQL Database you can use all tools listed on the following image to provide maintenance:



Regarding to Ola Hallengren's maintenance scripts, you can install them using psdbatool on a Managed Instance



Learn more about psdbatool here.

You can also install them manually.

And run them.

EXECUTE dbo.IndexOptimize
@Databases = 'mydbnamehere',
@FragmentationLow = NULL,
@FragmentationMedium = 'INDEX_REORGANIZE,INDEX_REBUILD_ONLINE,INDEX_REBUILD_OFFLINE',
@FragmentationHigh = 'INDEX_REBUILD_ONLINE,INDEX_REBUILD_OFFLINE',
@FragmentationLevel1 = 5,
@FragmentationLevel2 = 30,
@UpdateStatistics = 'ALL',
@OnlyModifiedStatistics = 'Y'


You may also need Azure Automation to schedule execution.