Caching for Performance
description
Transcript of Caching for Performance
Caching for Performance
Jeff Tapper
Tapper.net Consulting
Agenda
What is Caching Why is Caching important Where can I implement caching What to Cache within CFMX How to Cache within CFMX Summary
What is Caching
A Cache is a place where something is temporarily stored
By storing frequently used items, the need to recreate them is mitigated
Why is Caching Important
Each operation a server performs takes time / resources
By reducing the number of operations any server performs, we increase the ability for that server to handle more requests
Faster Page Loads Increased Scalability
Places to Cache
Database ColdFusion Web Server Network
Places to Cache
Network Diagram
What to Cache in CFMX
Data CFC instances Webservices Pages Content
What to Cache in CFMX
Data Caching common queries can
greatly increase speed pages are built
Reduces network traffic between CFMX and Database
What to Cache in CFMX
CFCs CFCs are the new core building
block of CFMX applications Instantiation of CFCs is an
expensive (slow) process
What to Cache in CFMX
Webservices Calling a webservice invokes a
complex process. Requests WSDL, parses it, makes
calls to methods Caching WSDL reduces over all
processing time 3-5x
What to Cache in CFMX
Pages Many applications have entire pages
which do not change frequently Caching the entire page can reduce time
needed by CFMX In some cases, pages can be cached as
HTML, removing the need for CFMX to process it at all
What to Cache in CFMX
Content Often, even in pages which are not
static, many sections of the page are.
Caching the static parts of the page reduces the time CFMX needs to build the page.
Data Caching in CFMX
Cached Within Cached After Storing query in shared scope
variables
Data Caching in CFMX
Benefits Great for dynamic
queries Easy to implement Built in Timeout
Drawbacks Purging non-trivial
Using CFQUERY attributes to CacheUsing CFQUERY attributes to Cache
Data Caching in CFMX
Benefits Easy to Manage Not limited by “Max
Number cached queries”
Drawbacks Not well suited for
dynamic queries More Complex
implementation Lacks built-in timeout
Query Caching in a shared scopeQuery Caching in a shared scope
CFC Caching in CFMX
Storing instances in shared scope variables
Page Context Bug
Webservice Caching in CFMX
CFMX automatically caches WSDL
Page Caching in CFMX
Trusted Cache CF_SuperCache Custom Built Solutions
Caching content in CFMX
CFCACHE CFSAVECONTENT
Summary
Effective use of caching can greatly extend the scalability of an application
Every application offers a myriad of caching possibilities
Caching opportunities exist both within and outside the CFMX server
Questions
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