I said before cache engines can be faster in both write and read operations. We’ve just been removing write and read requests from MySQL. But other backends could be written. We coudl also talk about the lock API in Drupal lock. Available cache backends are:
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Let’s look at a complete configuration, for Drupal6 the cache backport module would require these lines: We coudl also talk about the lock API in Drupal lock. Drupal use a lot of caches at different levels but all of them are by default stored in the database. 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. The only thing we need know is a documentation on how to configure these.
Drupal use a lot of caches at different levels but all of them are dtupal default stored in the database. Take your Drupal Database and check what are the cache tables used, here I’ll use a quite basic default Drupal installation on Drupal So, well, here my example is a quite little website.
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Cache tables are small and not heavily used. You would get bigger numbers on a big website. But anyway, the real problem in term of performance here is not on the size of caches or the size of the indexes, but on the number of read and write queries running on theses tables.
Soon enough you will ask yourself « Could I use some smarter solutions like Memcache for the cache storage? And of course some existing modules could help you doing that. The memcache module, for example. And the « cache router » module applied some of the ideas we’ll study later on this article. You may wonder why it is smart to use something which is not the database to perform the caching storage?
I said before cache engines can be faster in both write and read operations. So now you may ask « why don’t we use Cache engines for everything?
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. Use the right tool for the right thing. But this is still a good question. For now we’ll just have a look at the cache tables problems.
The cache management has been rewritten, using cache router and memcached ideas and try to put the things one step further in the core. And for each bin you can specify which storage backend will be used. But other backends could be written. Module maintained by pounarda Makina Corpus worker.
There is also a MongoDB module providing a mongodb cache backend beta2that I did not test yet, powered by Damien Tournoud. The only thing we need know is a documentation drpual how to configure these.
This is always almost provided in the module documentation but we will use the cache backport module documentation as an example.
This module, again maintained by pounardis a backport of Drupal7 cache engine separating backends for Drupal6. So it’s a replacement for Cache Router where you can reuse the cache parts vrupal Drupal7 cache backends in a Drupal6 website.
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.
Separate cache Backends with Drupal6 and Drupal7
The first question is « where should I put each separate cache bin or each cache table for short? They will love the APC cache backend. For all the others bins you could apply a different policy. You may want to keep some bins in the database, but you should test the memcached backend for most bins.
You could also ddrupal the filecache backend, with a modern linux kernel often used files will get mapped into memory buffers and you may get good results. There is no magic rules, the best tool will depend on your cache usage and on used modules.
But you will need to allow some memory for 7.62 new backends, maybe some of the memory given previously to MySQl or Apache. Keep in mind that you should never make a server swap. Let’s look at a complete configuration, for Drupal6 the cache backport module would require these lines:.
And now for Drupal7 or Drupal6 we would have of course it depends of the drhpal available on your installation, check the table created in MySQL to see what bin are requested by the modules:. We’ve just been removing write and read requests from MySQL. So by definition it’s quite hard to perform some fine tunning on the MySQL server if this table is not removed. To be honest statistics tracking can also make a lot of write requests, but this is yet another problem The Cache Backend management is not responsible of the session storage at least by default.
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Memcache module is providing a tool for that, Cache Router module was announcing it as well. But The use of a new Module called Session Proxy should be the definitive solution, allowing usage of a cache backend or usage of PHP native sessions which can drpual set to memcache.
Today it’s still a sandboxed module, no official release.
More on this module when released like how to manage session locks, how to configure the cache backend for drupap, etc. We coudl also talk about the lock API in Drupal lock. Some modules provides lock alternatives which are faster like the Redis module Sorti finle CMS Drupal 8 a basculé dans un nouveau cycle de versions tous les 6 mois. Pourquoi Drupal 8 est un bon choix pour réaliser un site d’université.
In this article we’ll study how to push all these caches in better places. The default situation Drypal your Drupal Database and check what are the cache drupa, used, here I’ll use a quite basic default Drupal installation on Drupal6: You could maybe druppal completely the database requests in aggressive mode Dedicated 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.
With core modules only, adding Panels, some views and some other modules and you could grow up to requests. 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. Cache backends with Drupal7 Now comes Drupal7.
Available cache backends are: If you rrupal several Apache drpual you will have one APC cache per server, but it’s not a big one, be careful and part of the available memory space is occupied by the opcode. In case of full cache overflow the cache is completely wiped out, so do not use that for long persistency. To use the well known memcached daemon.
Or do you want some configuration details? Let’s look at a complete configuration, for Drupal6 the cache backport module would require these lines: TXT in FileCache directory for configuration details. Follow me also on regilero.