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ObjectQuery tutorial - step 2

With the following steps, you can continue to create an ObjectGrid with one map and an index, along with a schema for the map. Then you can insert an object into the cache and later retrieve it using a simple query.

Before you begin

Be sure that you have completed ObjectQuery tutorial - step 1 before proceeding with this step of the tutorial.


Schema and index

// Create an index
    HashIndex idx= new HashIndex();

The index must be a instance with the following settings:

When a query runs that filters on the itemName field, the query engine automatically uses the defined index. Using the index allows the query to run much faster and a map scan is not needed. The next step demonstrates how an index can be used to optimize the query.

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ObjectQuery tutorial

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ObjectQuery tutorial - step 1

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ObjectQuery tutorial - step 3