[PDF] Query & Search Optimization Cheat Sheet





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Query & Search Optimization Cheat Sheet

Query & Search. Optimization Cheat Sheet. DATABASE. Force.com Query Optimizer - Standard Index. # of records. First Threshold. Second Threshold. Final Threshold.



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  • How do you optimize a SQL query step by step?

    The Query Optimizer analyzes different ways the source tables can be accessed. It then selects the series of steps that return the results fastest while using fewer resources. The query tree is updated to record this exact series of steps. The final, optimized version of the query tree is called the execution plan.

  • How to improve query optimization in SQL Server?

    For your queries, you need to dparameterize them, but you do not need to cache them in all cases. If your queries tend to have a big cost (so compilation times are inconsequential) you will want to run them WITH OPTION RECOMPILE so SQL Server can adapt to the exact runtime values of all parameters.
http://developer.salesforce.comQuery & Search Optimization Cheat Sheet

DATABASE

Force.com Query Optimizer - Standard Index

# of records First ThresholdSecond ThresholdFinal Threshold ≥ 5.6 million300,000700,001 millionForce.com Query Optimizer - Custom Index # of records First ThresholdSecond ThresholdFinal Threshold ≥ 5.6 million100,000333,333333,333

Index Selectivity Exceptions

Filter Conditions WithIn SOQLIn Reports and List Views

Negative filter operators!=

NOT LIKE

EXCLUDESnot equal to

does not contain excludes

Comparison operators

paired with text fields < >= less than greater than less or equal greater or equal

Leading "%" wildcards

LIKE '%string%'contains

References to non-

deterministic formula fields

Cross-object formula fields

Overview

When building queries, list views, and reports, it's best to create filter conditions that are selective so Force.com scans only the rows necessary in the objects your queries target - the Force.com query optimizer doesn't use an index to drive queries containing unselective filter conditions, even if the fields those filter conditions reference already have indexes on them. (This cheat sheet's "Index Selectivity Exceptions" section points to several things that automatically make filter conditions unselective.) Because filter conditions are also unselective if they exceed the Force.com query optimizer's thresholds, selectivity is especially important when your queries target objects containing more than one million records. Read on to learn how to write selective filter conditions, minimize

your query response times, and optimize your database's overall performance.Fields with Database Indexes

Indexed Standard Fields, All Objects

Id Name

OwnerId

CreatedDate

SystemModstamp

RecordType (indexed for all standard objects that feature it)

Master-detail fields

Lookup fields

Other Indexed Fields

Unique fields

External ID fields

Index Selectivity Conditions and Thresholds

Condition ThresholdsIndex Used

Unary:

standard indexFilter targets less than:

Standard index

Unary:

custom index

Filter targets less than:

Custom index

AND

Filter targets less than:

Composite index

OR

Filter targets less than:

Index union

LIKE

For conditions that don't start with a leading

wildcard, Force.com tests the first 100,000 rows for selectivity.Standard index or custom indexTotal Records

30% of 1-1M records 15% of 1M+ records

300,000 ceiling 700,000 ceiling

Final Threshold

1M Ceiling

Total Records

10% of 1-1M records 5% of 1M+ records

100,000 ceiling 233,333 ceiling

Final Threshold

333,333 Ceiling

11182013For other cheatsheets: http://developer.force.com/cheatsheets

Related Resources

On Architect Core Resources: developer.force.com/architect (article) (paper) (webinar recording)

On the Force.com Blogs: blogs.developerforce.com

"Collecting Selectivity Statistics for Force.com Queries" "Dealing with Exception Filters in Force.com" "Force.com Formula Fields, Indexes, and Performance Gotchas" "Force.com SOQL Best Practices: Nulls and Formula Fields" "Maximizing the Performance of Force.com SOQL, Reports, and List Views"

In the Salesforce Help: help.salesforce.com

"Build Effective Filters" (documentation) "Getting the Most Out of Filter Logic" (documentation) "How to Improve Listview Performance" (Salesforce Knowledge article) "Improve Report Performance" (documentation) "Search Overview" (documentation) SOSL

Search Selectivity Tips

Be as selective as possible. For example, use Michael*, not Mich*. Remember that Chatter feed searches aren't affected by the scope of your search, and that their results include matches across all objects.

Search for exact phrases using advanced searches.

Limit scope by targeting:

Specific objects

Rows owned by the searcher

Rows within a division, when applicable

Fields with Search Indexes (Vary by Object)

Name fields

Phone fields

Text fields

Picklist fields

Follow Us

Twitter

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Steve Bobrowski - @sbob909

Alex Dimitropoulos - @adimitrop

Daisuke Kawamoto - @DaisukeSfdc

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Bud Vieira - @aavra

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