GAE Search API和数据存储区查询有什么区别？

Question

I'm trying to understand which one of the search API or querying the datastore will be the most accurate for a search engine in my app.

I want something very scalable and fast. That's mean be able to find something among up to millions results and very quickly. I mean as soon as a data has been registered , this one must be immediately searchable.

I'm seeking to make an autocomplete search system inspired by the google search system (with suggested results in real time).

So, what is the more appropriate option to use for A google app engine user ?

Thanks

Answer 1

Both Search API and the Datastore are very fast, and their performance is not dependent on the number of documents that you index.

Search API was specifically designed to index text documents. This means you can search for text inside these text documents, and any other fields that you store in the index. Search API only supports full-word search.

The Datastore will not allow you to index text inside your documents. The Datastore, however, allows searching for entries that start with a specific character sequence.

Neither of these platforms will meet your requirements out of the box. Personally, I used the Datastore to build a search engine for music meta-data (artist names, album and recording titles) which supports both search inside a text string and suggestions (entries that contain words at any position which start with a specific character sequence). I had to implement my own inverted index to accomplish that. It works very well, especially in combination with Memcache.