Statistics in Synapse Dedicated SQL Pools is without question the most important and the most frequently overlooked reason for poor query performance. SQL Server is forgiving in that autocreate and autoupdate statistics are frequently enabled but Synapse only offers autocreate statistics. Autoupdate statistics is not an option available in Synapse today. This leads to a…
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Synapse Dedicated SQL Pool Execution Plans
Synapse execution plans are specifically for distributed SQL (DSQL) and are not the same as SQL Server execution plans. SQL Server execution plans show the types of join patterns (hash, nested, loop), bookmark lookups, sorts, etc… Whereas Synapse execution plans show you how data must move between the different distributions of a Synapse Dedicated SQL…