Table order in MicroStrategy generated SQL

Understanding FROM Clause Order in MicroStrategy

How SQL table order can affect execution plans and when to tune it using VLDB settings.

Most modern databases optimize joins effectively regardless of table order in the FROM clause. But some engines still produce different execution plans depending on how tables are arranged. MicroStrategy handles this with the From Clause Order VLDB property under Joins.

Default Table Order in MicroStrategy

Fact Tables
Metric Qualification (MQ) Tables
Relationship Tables
Lookup Tables

SQL optimization and join planning concept

VLDB Setting View

From Clause Order options in MicroStrategy

From Clause Order Options

1) Normal FROM clause order (Default)

Uses the standard sequence:

Fact Tables
MQ Tables
Relationship Tables
Lookup Tables

2) Move last table to first

Moves the last table (usually a lookup table) to the beginning of the FROM clause. Useful in some Oracle workloads.

3) Move MQ table to last (for Redbrick)

Reorders tables as:

Fact Tables
Relationship Tables
Lookup Tables
MQ Tables

4) Reverse FROM clause order

Reverses the default sequence:

Lookup Tables
Relationship Tables
MQ Tables
Fact Tables

Important Note

From Clause Order mainly controls SQL syntax order, not report logic. Results should stay consistent across options. With inner joins, only table position changes. With one-sided outer joins, join direction may change when order is altered.

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