Re: [xwiki-users] Number of attachments on an XWiki page
Some WEB-INF/xwiki.cfg settings that might improve performance w/r/t attachments (note the uncommented portions): ... #-# Whether the document recycle bin feature is activated or not # xwiki.recyclebin=1 #-# Whether the attachment recycle bin feature is activated or not storage.attachment.recyclebin=0 #-# Whether the document versioning feature is activated or not # xwiki.store.versioning=1 #-# Whether the attachment versioning feature is activated or not xwiki.store.attachment.versioning=0 #-# Whether the attachments should also be rolled back when a document is reverted. xwiki.store.rollbackattachmentwithdocuments=0 ... Corollary questions for the list: (1) When these are set, do the issues raised by Guillaume still apply? (2) Other than the obvious change of not having attachments change when rolling back documents, are there any other side-effects or caveats in using the above custom settings for a Xwiki instance? (3) What about the same performance question, but regarding comments attached to documents. Is the main performance impact coming from the total size of comments, or from the number of comment objects attached to documents? (Of course comments are limited to 64K so the size issue is somewhat self-limiting). Niels http://nielsmayer.com PS: Ms Coleman -- Could you please disable your away mail reminder program from bouncing to the list? Thanks. [xwiki-users] AUTO: MaryEllen Coleman/Poughkeepsie/IBM is out of the office. (returning 11/04/2009) ___ users mailing list users@xwiki.org http://lists.xwiki.org/mailman/listinfo/users
[xwiki-users] Number of attachments on an XWiki page
Is there a limit to the number of files that can be attached to an XWiki page? If a page has 199 attachments, would it cause any problems or issues? ** Mary Ellen ___ users mailing list users@xwiki.org http://lists.xwiki.org/mailman/listinfo/users
Re: [xwiki-users] Number of attachments on an XWiki page
Hi Mary Ellen, On Tue, Nov 10, 2009 at 4:22 PM, MaryEllen Coleman m...@us.ibm.com wrote: Is there a limit to the number of files that can be attached to an XWiki page? If a page has 199 attachments, would it cause any problems or issues? More than the total number of attached files, it's the size of those files that might be an issue. Each time a new document is added a new version of the page is stored on the database, that has a copy of all the other documents currently attached to itself. Meaning that if each of your attached files is 1MB, your total page size is 200MB and each time you add an attached file it becomes a bit heavier. Once it becomes really big operations on that page start taking a lot of time and consume a lot of memory resources. To make it short: it will work if you've got a big computer on the backend but it's not recommended. A better solution would be to create a new page for each file and list all the pages you've created (since XE 1.8 you can use a space homepage for this). Guillaume ** Mary Ellen ___ users mailing list users@xwiki.org http://lists.xwiki.org/mailman/listinfo/users -- Guillaume Lerouge Product Manager - XWiki SAS Skype: wikibc Twitter: glerouge http://guillaumelerouge.com/ ___ users mailing list users@xwiki.org http://lists.xwiki.org/mailman/listinfo/users
Re: [xwiki-users] Number of attachments on an XWiki page
On Nov 10, 2009, at 4:32 PM, Guillaume Lerouge wrote: Hi Mary Ellen, On Tue, Nov 10, 2009 at 4:22 PM, MaryEllen Coleman m...@us.ibm.com wrote: Is there a limit to the number of files that can be attached to an XWiki page? If a page has 199 attachments, would it cause any problems or issues? More than the total number of attached files, it's the size of those files that might be an issue. Each time a new document is added a new version of the page is stored on the database, that has a copy of all the other documents currently attached to itself. Meaning that if each of your attached files is 1MB, your total page size is 200MB and each time you add an attached file it becomes a bit heavier. Once it becomes really big operations on that page start taking a lot of time and consume a lot of memory resources. I'm not sure this is right. Attachments are not loaded when the doc is loaded (only the list of attachment is loaded which is a single query to the DB to get the names) so you can have as many as you want I believe. It's only when an attachment is manipulated and thus loaded in memory that it takes up memory space. Now I haven't tested it for real so I don't really know. Can someone with more experience qualify this answer? To make it short: it will work if you've got a big computer on the backend but it's not recommended. A better solution would be to create a new page for each file and list all the pages you've created (since XE 1.8 you can use a space homepage for this). This is pretty cumbersome and I wouldn't recommend it. Thanks -Vincent Guillaume ** Mary Ellen __ ___ users mailing list users@xwiki.org http://lists.xwiki.org/mailman/listinfo/users
Re: [xwiki-users] Number of attachments on an XWiki page
On Tue, Nov 10, 2009 at 16:46, Vincent Massol vinc...@massol.net wrote: On Nov 10, 2009, at 4:32 PM, Guillaume Lerouge wrote: Hi Mary Ellen, On Tue, Nov 10, 2009 at 4:22 PM, MaryEllen Coleman m...@us.ibm.com wrote: Is there a limit to the number of files that can be attached to an XWiki page? If a page has 199 attachments, would it cause any problems or issues? More than the total number of attached files, it's the size of those files that might be an issue. Each time a new document is added a new version of the page is stored on the database, that has a copy of all the other documents currently attached to itself. Meaning that if each of your attached files is 1MB, your total page size is 200MB and each time you add an attached file it becomes a bit heavier. Once it becomes really big operations on that page start taking a lot of time and consume a lot of memory resources. I'm not sure this is right. Attachments are not loaded when the doc is loaded (only the list of attachment is loaded which is a single query to the DB to get the names) so you can have as many as you want I believe. It's only when an attachment is manipulated and thus loaded in memory that it takes up memory space. Now I haven't tested it for real so I don't really know. Can someone with more experience qualify this answer? Yes attachment content is loaded on demand, when you load a page you get only a list of attachments names. To make it short: it will work if you've got a big computer on the backend but it's not recommended. A better solution would be to create a new page for each file and list all the pages you've created (since XE 1.8 you can use a space homepage for this). This is pretty cumbersome and I wouldn't recommend it. Thanks -Vincent Guillaume ** Mary Ellen __ ___ users mailing list users@xwiki.org http://lists.xwiki.org/mailman/listinfo/users -- Thomas Mortagne ___ users mailing list users@xwiki.org http://lists.xwiki.org/mailman/listinfo/users
