Row Counts From Statistics In Azure DW

Derik Hammer has a script to estimate row counts in an Azure SQL Data Warehouse table:

Azure SQL Data Warehouse is a massively parallel processing (MPP) architecture designed for large-scale data warehouses. An MPP system creates logical / physical slices of the data. In SQL Data Warehouse’s case, the data has 60 logical slices, at all performance tiers. This means that a single table can have up to 60 different object_ids. This is why, in SQL Data Warehouse, there is the concept of physical and logical object_ids along with physical names.

Below is a query for finding row counts of tables in SQL Data Warehouse which accounts for the differences in architecture between my earlier script, written for SQL Server, and SQL Data Warehouse.

Click through for the script.

Related Posts

Modeling Semi-Additive Measures

Paul Poco shows a couple techniques for modeling semi-additive measures in Analysis Services and Power BI: As mentioned earlier, the most commonly encountered approach is Option 2, the snapshot fact table. The main drawback of this approach is that the fact table’s size will grow extremely fast. For example, if you want to calculate the headcount in a company with 10,000 employees on average, and you want 5 […]

Read More

Hot Patching Azure SQL Database

Hans Olav Norheim has an interesting paper on a technique Microsoft uses to release SQL Server patches for Azure SQL Database while minimizing downtime: The SQL Engine we are running in Azure SQL Database is the very latest version of the same engine customers run on their own servers, except we manage and update it. […]

Read More

Categories

January 2018
MTWTFSS
« Dec Feb »
1234567
891011121314
15161718192021
22232425262728
293031