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The site in question is a large (Around 1.5m pages) dynamic web site which has been live for around nine months. The homepage, which has been a PR3 for a while has increased to a PR of 4, whilst many of the sub-pages which had some page rank (Albeit relitavely low numbers) have lost it completely. Please note that they have no PR, but are NOT greyed out.
Along with this, the amount of pages in the Google index has fluctuated massively. In the space of a few days the number of non-supplemental pages in the index has been known to fluctate from as low as 500 to as high as 16,000.
We have made no major changes to the content or structure of the web site. The only modifications we have made have been minor tweaks to the inner workings of the site, most of which are in password protected 'member areas' anyway.
Could anybody shead any light on what's happening? Are we making some kind of mistake, or is this just evidence of Google switching from data centre to data centre?
I'd appreciate any information and / or advice.
Checking with both GToolbar and an extension in my browser showed a PR0 for most subpages, with the homepage still at a PR7.
However, the pages were still ranking as they always had, so I chalked it up to something stupid with the data being exported to the TB.
This morning I noticed that another of my browser extensions (one that displays information inline with SERPs) is showing the correct PR for those pages again.
Has your situation changed recently?
What I really can't get my head round is how pages are seemingly de-indexed, then re-indexed on an almost daily basis. It's happened five or six times now, where the amount of indexed pages has risen from only a few hundred up to several thousand, then back down again. And so on, and so on.
I'll try to give you a rough idea of the site without infringing upon the TOS. The site caters for millions of parts that make up different types of urm...'machinery', if you like. There is a directory type structure; so you find the right machine manufacturer, then the model and so on until you reach the specific part you are looking for.
These pages are dynamically generated, but are nescessary to fulfil the web site's objective. They are in no way intended to spam seach engines, however there may be pieces of information that are repeated over and over again. This is in no way intended to spam the search engines.
For example, there is a table which displays all of the parts available, and the information is displayed like:
'Manufacturer' 'Model' 'Model Derivative' 'Part Name'
Obviously, in this example the manufacterer, model and model derivative will be repeated, sometimes up to 100 times on one page. This is important for functionality, but is it causing us problems with Google?
LOL, The PR bar has next no influence on ranking, so I would not worry.
Do an experiment in G, search for the top 10 in your industry and see if there is a correlation in terms of PR to Ranking.