1. Improving Database Performance Derrick Rapley adrapley@rapleyzone.com www.cfbookmark.com

2. Agenda Query Life Cycle Caching Variable-based Query Caching Stored Procedures Block Factor Caching Variable-based Query Caching Using SQL JOINS Microsoft Access

3. Query Life Cycle 1. Request sent to CF to process a template 2. ColdFusion executes 3. CF sends SQL statement to the DB 4. CF waits for a response from the DB 5. DB parses the SQL statement 6. DB executes the SQL statement 7. DB returns record set to CF 1 record at a time

4. Caching Queries that hardly change are perfect for caching. I.E. List of Document Types Queries can be stored in Shared Scope variables: Session, Application, Server Queries can be cached based on Results

5. Variable-based Caching SELECT type_id, doc_type FROM doctype #doc_type#

6. Query Caching Two attributes can be used in CACHEDWITHIN-caches data for a specified time span CACHEDAFTER-caches data until a specific date is reached. Queries are only cached if there is enough space. If not, the query won’t cache and operate as normal. Perform a Q of Q on a Cached Query for ‘Next N’ records and search results

7. Parsing, validating, and analyzing the query can take longer than actually processing it Simple queries are easy to cache. SELECT id, FirstName, LastName FROM Employees It’s a waste of time and space to cache dynamic queries, perfert for cfqueryparam. SELECT id, FirstName, LastName FROM Employees WHERE ID = helps differentiate what is dynamic in the SQL statement

8. Must be used within Supports Bind Parameters Improves Performance Provides some benefits of Stored Procedures without using them Can be used with Stored Procedures when using to call them Can not be used with Cached Queries

9. SELECT id, FirstName, LastName FROM Employees WHERE ID =

10. CF_SQL_BIGINT CF_SQL_BIT CF_SQL_CHAR CF_SQL_DATE CF_SQL_DECIMAL CF_SQL_DOUBLE CF_SQL_FLOAT CF_SQL_IDSTAMP CF_SQL_INTEGER CF_SQL_LONGVARCHA R CF_SQL_MONEY CF_SQL_MONEY4 CF_SQL_NUMERIC CF_SQL_REAL CF_SQL_REFCURSOR CF_SQL_SMALLINT CF_SQL_TIME CF_SQL_TIMESTAMP CF_SQL_TINYINT CF_SQL_VARCHAR

11. Stored Procedures Execute faster than SQL from the client Precompiled SQL Statements Stored in the database Returns the a complete record set as a result Can execute a block of Statements Increased Security Access to tables unavailable to the user Can use and

12. OR Can only be used when native driver is available It only passes ODBC compliant code to an ODBC driver Stored Procedures can vary depending on which database is being used can always be used

13. Block Factor Rows are retrieved from the database one row at a time Block Factor is the number of rows retrieved at one time (defaults to 1) Block Factor can hurt performance if too high of a Block Factor is declared

14. SQL JOINS A Relational DB is key to using JOINS Advantages of Relational DB Data does not have to be repeated Easier to maintain Uses Less Storage Space Performs quicker than flat DB Documents Doc_IDTitleDoc_type_id 101Creating A Relational Database11 102Using Stored Procedures12 103Caching Queries 104Joining Tables Together11 DocType Type_IDDoc_Type 11Word 12PDF 13XML

15. Using Joins Specify tables in FROM clause SELECT documents.title, doctype.doc_type FROM documents, doctype How does the DB know which rows to join? Inner Joins Right Outer Joins Left Outer Joins Full Outer Joins

16. Using Joins You must specify the join condition Can be specified in the WHERE clause SELECT doc.title, dt.doc_type FROM documents doc, doctype dt WHERE doc.doc_type_id = dt.type_id Can be spcified in the FROM clause (ANSISQL Standard) SELECT doc.title, dt.doc_type FROM documents doc JOIN doctype dt ON (doc.doc_type_id = dt.type_id) JOIN sytax is similar in most databases but can vary

17. Inner Join If no Join is specified, then INNER JOIN is assumed SELECT doc.title, dt.doc_type FROM documents doc INNER JOIN doctype dt ON (doc.doc_type_id = dt.type_id) INNER JOIN only matches rows in both tables

18. Outer Join LEFT OUTER JOIN Returns all rows from left table RIGHT OUTER JOIN Returns all rows from right table FULL OUTER JOIN Returns all rows from both tables

19. Microsoft Access Obtain the latest ODBC drivers Obtain the latest MDAC Only allow 5-7 simultaneous (per Processor) requests to Access Uncheck ‘Maintain Database Connection’ in CF Administrator Max Buffer should be set to 0