vb.net qr code library Figure 10-21. Restoring a backup in Visual Basic .NET

Encoding DataMatrix in Visual Basic .NET Figure 10-21. Restoring a backup

Figure 10-21. Restoring a backup
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Caution If your database is quite large, the restore script may run afoul of your host s PHP script
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timeout. If you click Start Restore and nothing happens after five minutes, it s quite possible the script has terminated due to the timeout period, which is designed to stop runaway scripts. You can try breaking up the file (if it is compressed, use WinZip or WinRAR on Windows to decompress it first) and uploading separate text files. Contact your host provider if you have questions about its PHP timeout policies.
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Using Template Caching
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When the styling system made its debut in phpBB 2.0, there was a great deal of concern over increased server load due to the templates. Time has shown that phpBB s template engine is a solid performer under load, but the phpBB Group provides two options for caching templates: one for using individual files and the other to save template information to the database. These solutions will help decrease the strain on your server under periods of extreme duress.
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Caution The phpBB Group has tested the caching systems, but as always, your mileage may vary. Back up the template.php file located in the /includes subdirectory under your phpBB path before proceeding, in case something goes wrong. Additionally, you can choose only one system or the other, not both.
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Flat-File Template Caching
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If you are going to use template caching, I recommend using the flat-file method, as it does not require further use of the database. Boards under duress already stress the database, so it s good to try to offload from the database when you can.
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CHAPTER 10 SECURING AND MAINTAINING PHPBB
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Extract template_file_cache.php from the /contrib folder from your phpBB installation package and place it in the /includes subdirectory. Remove the existing template.php file after ensuring it is backed up in a safe place, and rename template_file_cache.php to template.php. Next, you will need to upload the /cache subdirectory and its contents from your phpBB installation package to the server, and make it world-writable (777). As I discussed in 8, SmartFTP (http://www.smartftp.com) makes this task easy. Upload the newly christened template.php to your server (in the /includes subdirectory), and you will be finished. Visit a few pages on your board and take a look at the /cache subdirectory, and you should see some files inside, indicating caching is happening.
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Database Template Caching
If you decide to go the database route, extract template_db_cache.php. Copy it over your existing template.php file (after making a backup of that file). In this case, you will not create a cache subdirectory, but rather a new table in your database. Log in to phpMyAdmin, select your phpBB database, and navigate to the SQL tab at the top. You ll be running another raw SQL query, shown in Listing 10-1, in this box. The <your_prefix> represents whatever database prefix you are using on your server, which defaults to phpbb. Listing 10-1. The SQL Query to Run in phpMyAdmin to Create the New Caching Table CREATE TABLE <your_prefix>_template_cache ( template_name char(255) NOT NULL default '', template_handle char(50) NOT NULL default '', template_cached int(11) NOT NULL default '0', template_echo tinyint(1) NOT NULL default '1', template_compile text NOT NULL, PRIMARY KEY (template_name) )
You can find this same query in the README.html file located in the /contrib folder of your phpBB Tip
installation or upgrade package. It will be easier and less error-prone for you to copy and paste the query than for you to type it straight in.
After creating the table, upload the enhanced template.php file to your includes subdirectory (as for the flat-file system). Visit a few pages of your phpBB, and open the template_cache table in your phpBB installation to ensure that there is activity in the table, indicating that the caching is working properly.
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