Loss Some index in google

my total index in google was 20000 and now this time just 11300 why Google delete my index.what is reason behind them

 

What is your website? How do you populate it? Is it an autoblog?

 

can you give here the url so that we can check.

 

yeah it happens usually!!!
coz google now a days cahches a particular web pages twice!!!
In the first case it adds the major relevant links and then filtersw it out in the second case!!!
and we assume it as removal of it, but looking to the fact,the second one ar permanent

 

This kind of Googlebots activity just happened lately, regardless to site quality or authoritative status. I have investigated about this since it has happened to 80% of my sites, but still have no exact clue yet. However, it is not effect website ranking and link popularity anyway.

 

There are a few reasons why google removes pages from it's index.
- Google now tries to identify and remove duplicate content. If you are syndicating content from elsewhere, Google may remove those pages from it's index.
- Duplicate titles. If you have many pages that have the exact same page title, Google may not index all of them.
- Multiple URLs for the same page. If you have serveral different paths to get to the same page in your site, Google may not index all of them.

 

When you post contetn on your site and do use the trick to aproach search engine to get your site site it get index instant but some days later google also do it filter due to many reason liek duplicate content, twice index page etc

 

Same thing happened to me. If you do too many back links in a short time Google thinks is spam and the index is out for several days or even weeks.

 

We're talking about indexed pages right ...? You probably have many duplicate titles that has dropped it down.