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In the last ten posts, we have discussed in details about the SQL server index and its storage structure. In this post I will consolidate all the ten post for easy reference.
What is index ?
In the first post, we have discussed about index in general. We...
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Now we have discussed about different types of indexes in the last posts. In this post, let us discuss about the key column order (order of the column of indexes). The order of the key column of the index is decided based on the data access pattern an...
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Filtered index is a new feature introduced in SQL Server 2008. All the indexes that we have discussed till now were always on the entire table. In other words, Index and table will have same number of records.With filtered index, it is possible to...
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In our earlier discussion about non clustered index ,we have seen that, the leaf level of a non clustered index contain only the non clustered index key column and clustered index key (if the table is a clustered table). To fetch the remaining colum...
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In our earlier post, we have discussed about the non clustered index, but there we were always discussing about unique non clustered index to make the discussion simple.As we understood the general structure of the non clustered index, let us discu...
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In our earlier post, we have discussed about the structure and storage of clustered index. In this post we will discuss about the design consideration of clustered index.There are couple of points that need to be considered while selecting clustered i...
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In SQL server, there are two types of table based on the storage.A table with clustered index is called Clustered Table and a table with out a clustered index is called Heap Table. In earlier post, we have discussed about the specialty and the storag...
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In the last post, we have discussed about non clustered index on a clustered table.In this post we will discuss about the non clustered index on a heap table.
Non clustered index can be created on clustered table as well as heap table.While creat...
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A table can have only one clustered index as the data rows are stored in the order of the clustered key, but a table can have multiple non clustered indexes.We have discussed about clustered index structure in our earlier post . In this post let us t...
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In my earlier post, we have discussed about Data,GAM,SGAM and PFS pages. In this post, let us try to understand about the IAM (Index Allocation Map) page.
In SQL server 2005 and later, there are three types of allocation units.
IN_ROW_DATA (bt...
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