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The CSS tab displays CSS files used on a page. Its toolbar includes a few commands that let developers access and navigate CSS files loaded by IE; these are shown in Table 5 6. Table 5 6. CSS Tab Toolbar Buttons

Two common choices for MySQL storage engines, often called table types, are MyISAM and InnoDB. Drupal uses MyISAM by default. MyISAM uses table-level locking, while InnoDB uses row-level locking. Locking is important to preserve database integrity; it prevents two database processes from trying to update the same data at the same time. In practice, the difference in locking strategies means that access to an entire table is blocked during writes for MyISAM. Therefore, on a busy Drupal site when many comments are being added, all comment reads are blocked while a new comment is inserted. On InnoDB, this is less of a problem, since only the row(s) being written get locked, allowing other server threads to continue to operate on the remaining rows. However, with MyISAM, table reads are faster, and data maintenance and recovery tools are more mature. See http://dev.mysql.com/tech-resources/articles/storage-engine/part_1.html or http:// dev.mysql.com/doc/refman/5.1/en/storage-engines.html for more information on MySQL s table storage architectures. To test whether table-locking issues are the cause of slow performance, you can analyze lock contention by checking the Table_locks_immediate and Table_locks_waited status variables within MySQL. mysql> SHOW STATUS LIKE 'Table%';

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builds at different points in time and consistent builds amongst a team of developers. Technically, you only need to control the version of the bean class because everything related to that class will be regenerated.

Navigates to an element s definition in the HTML tab s DOM Explorer when it is clicked in the current web page. This will switch focus away from the CSS tab. Clears the browser cache for all domains and sessions. Saves all changes made in the CSS tab to a file. A drop-down list of files used by the current page that contain styles. Accessing an entry in this list will change the CSS displayed in the source pane of the CSS tab.

+-----------------------+---------+ | Variable_name | Value | +-----------------------+---------+ | Table_locks_immediate | 1151552 | | Table_locks_waited | 15324 | +-----------------------+---------+

Table_locks_immediate is the number of times that a table lock was acquired immediately, and Table_locks_waited is the number of times a table lock could not be acquired immediately and a wait was needed. If the Table_locks_waited value is high, and you are having performance problems, you may want to split up large tables; for example, you might create a dedicated cache table for a custom module or consider ways to reduce the sizes or the frequency of the table lock commands. One way to reduce table sizes for some tables, such as the cache_*, watchdog, and accesslog tables, is by reducing the lifetime of the data. This can be done within the Drupal administrative interface. Also, making sure cron is being run as often as once an hour will keep these tables pruned. Because Drupal can be used in many different ways, it is impossible to give an acrossthe-board recommendation as to which tables should use which engine. However, in general, good candidates for conversion to InnoDB are the cache, watchdog, sessions, and accesslog tables. Fortunately, the conversion to InnoDB is very simple: ALTER TABLE accesslog TYPE='InnoDB'; Of course, this conversion should be done when the site is offline and your data has been backed up, and you should be informed about the different characteristics of InnoDB tables.

In order to generate the interfaces and deployment descriptors in JST, you must be familiar with your chosen annotation tool. Since XDoclet is the only option at this point, this section will introduce you to some of the entity bean specific XDoclet annotations. This is not an exhaustive list. For a complete list, check out the XDoclet documentation at http://xdoclet.sourceforge.net/.

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TABLES command in core code, though the database API offers the db_lock_table() and db_unlock_tables() functions for contributed modules that need them.

For MySQL performance tuning, check out the performance tuning script at http:// www.day32.com/MySQL/, which provides suggestions for tuning MySQL server variables.

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