Sql updating table values

Manually updating statistics There are two ways to manually update statistics on a table.

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By default, statistics are compiled based on a sampling of the data in the table.

The sampling amount varies depending on the size of the table, but it can be as little as just a few percent to as much as 100% of the table.

We noticed that after we deleted the data and did a normal UPDATE STATISTICS command, the statistics would be useful for about three to four hours.

At that point, SQL Server would start doing index scans instead of index seeks.

Even if you use the @resample parameter the ratio of records sampled to the total number of records in the table remains the same.

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