1. The Complete Guide to Temporary Tables and Table Variables
Guy Glantser

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No use of the materials, in any form, is allowed,
unless receiving a prior written permission from Madeira Ltd

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5. First, a Basic Comparison…
Temporary Table
Table Variable
tempdb
Storage
Session
Batch
Scope
Yes
Constraints

6. First, a Basic Comparison…
Temporary Table
Table Variable
Yes
Indexes
Yes No
Statistics
Yes No
Recompilations

7. First, a Basic Comparison…
Temporary Table
Table Variable
Full
Minimal
T-Log Footprint No
Yes
Table Parameters
Yes No
Parallelism

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9. Bottom Line If the batch is executed only once in a while
Use a temporary table with OPTION (RECOMPILE)

10. Bottom Line If not (the batch is executed many times per second)
If the number of rows in the table is relatively fixed
Use a temporary table

11. Bottom Line If the number of rows in the table varies all the time
If performance with a temporary table is acceptable (due to recompiles)
Use a temporary table

12. Bottom Line If performance with a temporary table is not acceptable
If performance with a table variable is acceptable
Use a table variable

13. Bottom Line If performance is not acceptable either way
Try a hybrid solution

14. Bottom Line When using a table-valued parameter
Consider using trace flag 2453

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