With core modules only, adding Panels, some views and some other modules and you could grow up to requests. Cache tables are small and not heavily used. The default situation Take your Drupal Database and check what are the cache tables used, here I’ll use a quite basic default Drupal installation on Drupal6: This module, again maintained by pounard , is a backport of Drupal7 cache engine separating backends for Drupal6. We coudl also talk about the lock API in Drupal lock.
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Let’s look at a complete configuration, for Drupal6 the cache backport module would require these lines: Today it’s still a sandboxed module, no official release. Pourquoi Druapl 8 est un bon choix pour réaliser un site d’université. There is no magic rules, the best tool will depend on your cache usage and on used modules. Soon enough you will ask yourself « Could I use some smarter solutions like Memcache for the cache storage?
And for each bin you can specify which storage backend will be used. Use the right tool for the right thing.
And of course some existing modules could help you doing that. Cache backends with Drupal7 Now comes Drupal7. Today it’s still a sandboxed module, no official release.
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But other backends could be written. The only thing we need know is a documentation on how to configure these. You would get bigger numbers on a big website. So it’s a replacement for Cache Router where you can reuse the cache parts of Drupal7 cache backends in a Drupal6 website. For now we’ll just have a look at the cache tables problems. You could maybe avoid completely the database requests in aggressive mode Drupaal storage engine cache engines perform faster than a relational database both in write and read operations Reducing the number of requests made on MySQL is very important with Drupal, where a single page can be between 50 and requests.
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You may wonder why it is smart to use something which is not the database to perform the caching storage? And now druapl Drupal7 or Drupal6 we would have of course it depends of the bins available on your installation, check the table created in MySQL to see what bin are requested by the modules:. Cache tables are small and not heavily used.
So by definition it’s quite hard to perform drhpal fine tunning on the MySQL server if this table is not removed. The memcache module, for example. Keep in mind that you should never make a server swap. Memcache module is providing a tool for that, Cache Router module was announcing it as well.
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Let’s look at a complete configuration, for Drupal6 the cache backport module would require these lines:. You could also try the filecache backend, with a modern linux kernel often used files will get mapped into memory buffers and you may get good results. And One of the good points of this module is that it provides a centralized documentation on several cache backends which is spread on the different modules for Drupal7.
For all the others bins you could apply a different policy. So now you may ask « why don’t we use Cache engines for everything? With core modules only, adding Panels, some views and some other modules and you could grow up dgupal requests.
The cache management has been rewritten, using cache router and memcached ideas and try to put the things one step further in the core. In case of full cache overflow the cache is completely wiped out, so do not use that for long persistency.
Separate cache Backends with Drupal6 and Drupal7
I said before cache engines can be faster in both write and read operations. But this is not always true, depends a lot on your Drupal cache usages I said before cache engines can be faster in both write and read operations.
Available cache backends are: Or do you want some configuration details? In this article we’ll study how to push all these caches in better places. And the answer is that a relational database provides more services, it can for example provide a better persitency, or manage better simultaneous writes, or allow handling relationship between objects.
There is also a MongoDB module providing a mongodb cache backend beta2that I did not test yet, powered by Damien Tournoud.
But you will need to allow some memory for these new backends, maybe some of the dtupal given previously to MySQl or Apache. And the « cache router » module applied some of the ideas we’ll study later on this article. This module, again maintained by pounardis a backport of Drupal7 cache engine separating backends for Drupal6.