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The Devel module defines one user permission, Access Devel Information, which should be enabled for any roles that are to be involved in development or optimization of the site. Only users with this permission will see the page timer and query log when they are turned on, as described next.

Query userByName = session.createQuery("from User u where u.username= :uname"); userByName.setString("uname", username); userByName.setCacheable(true); userByName.setCacheRegion("UserQueries");

To configure the Devel module, navigate to administer settings devel (admin/settings/ devel). The settings page has options for enabling the page timer and the query log. The information they generate will be visible to users with the Access Devel Information permission. The Query Execution Threshold field is the threshold in milliseconds for queries to be considered slow. Queries that exceed this threshold or execute more than once will be highlighted in the query log that appears at the bottom of each screen (when this log is turned on). You can adjust this threshold to give you the most meaningful data. In many cases, Drupal will perform a set of queries and actions, only to redirect you to a screen or path other than the one you requested. A classic example of this is the 404 Not Found screen. For example, you request the page for node/4711, but there is no node with that ID, so Drupal tells you it can t find it. The problem this presents for debugging is that the SQL queries for the first part of the operation the part where Drupal looks up 4711 and doesn t find anything are not included in the query log because of the redirection that occurs thereafter. The Display Redirection Page field takes care of this problem by alerting you when a redirect is about to occur and waiting for your input before the redirect is carried out. This gives you the chance to inspect the queries that occur prior to the redirection as well as after.

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You can now configure the cache expiration policies using the region name. When query caching is enabled, the cache regions are as follows:

One thing you can do is to create your prototypes using machined parts to get that professional look, then go out and sell your accessory I don t mean to actually take.

Using the page timer and query log is a simple matter of browsing your site with them enabled and enjoying the bounty of information that they produce. Figure 4-20 shows an excerpt from a timer and query log.

The default query cache region, net.sf.hibernate.cache.QueryCache Each named region The timestamp cache, net.sf.hibernate.cache.UpdateTimestampsCache, which is a special region that holds timestamps of the most recent updates to each table

Hibernate uses the timestamp cache to decide if a cached query result set is stale. Hibernate looks in the timestamp cache for the timestamp of the most recent insert, update, or delete made to the queried table. If it s later than the timestamp of the cached query results, then the cached results are discarded and a new query is issued. For best results, you should configure the timestamp cache so that the update timestamp for a table doesn t expire from the cache while queries against the table are still cached in one of the other regions. The easiest way is to turn off expiry for the timestamp cache. Some final words about performance optimization: Remember that issues like the n+1 selects problem can slow your application to unacceptable performance. Try to avoid the problem by using the best fetching strategy. Verify that your object-retrieval technique is the best for your use case before you look into caching anything. From our point of view, caching at the second level is an important feature, but it isn t the first option when optimizing performance. Errors in the design of queries or an unnecessarily complex part of your object model can t be improved with a cache it all approach. If an application only performs at an acceptable level with a hot cache (a full cache) after several hours or days of runtime, you should check it for serious design mistakes, unperformant queries, and n+1 selects problems.

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