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POVery Slow Sql Server Query
 

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  1. POVery Slow Sql Server Query
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    <p>I have 2 tables resulted from merging the following tables:</p> <pre><code>Authors -Aid bigint -Surname nvarchar(500) -Email nvarchar(500) Articles -ArId varchar(50) -Year int -……Some other fields…… ArticleAuthors -ArId varchar(50) -Aid bigint Classifications -ClassNumber int -ClassDescription nvarchar(100) ClassArticles -ArId varchar(50) -ClassNumber int </code></pre> <p>After denormalizing these tables the resulted tables were:</p> <pre><code>Articles -FieldId int -ArId varchar(50) -ClassNumber int (Foreign key from the Classifications table) -Year int Authors -FieldId int -ArId varchar(50) (Foreign key from the Articles table) -Aid bigint -Surname nvarchar(500) -Email nvarchar(500) -Year int </code></pre> <p>Here are the conditions of the data within the resulted tables:</p> <ul> <li>SQL Server 2008 database</li> <li>The relationships between the two tables are applied physically</li> <li>The Authors table has 50 million records</li> <li>The Articles table has 20 million records</li> <li>The author has written many articles during the same year with different emails</li> <li>There are authors in the authors table with ArIds that don’t reference ArIds in the Articles table (Orphan records)</li> <li>The values within the Year fields ranges from 2002 and 2009</li> <li>The Articles table has a unique clustered index on the [FieldId and Year] fields and this index created on 9 partitions (1 partition per year)</li> <li>The Authors table has a non-unique clustered index on the [Year, ArId, Aid] fields and this index is created on the same 9 partition as the Articles table (1 partition per year)</li> </ul> <p>The question is:</p> <ul> <li><p>We need to create a stored procedure that gets the following result from the two tables [Aid,Surname,Email] under the following conditions:</p></li> <li><p>Authors that have written articles during and after a specific year (AND)</p></li> <li>The total number of articles for the author is greater than a specific number (AND)</li> <li>The count of the articles written by the author under a specific ClassNumber is greater than a specific percentage of the total number of his articles (AND)</li> <li>Get only the most recent email of the author (in the last year during which he has written an article)</li> <li>If the author has more than one email in the same year, get them all.</li> </ul> <p>We need the query to take the least possible time</p> <p>If anyone can help, Thank you very much.</p>
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