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SQL Server 2014: ONLINE operation on a single partition of partitioned object

Here I continue a series of articles devoted to new options in SQL Server 2014. Today let's review another useful operation - ONLINE rebuilding some partitions of partitioned objects (tables or indexes).First let me remind you that some versions of SQL Server (Enterprise, Evaluation, Developer) allow you to perform a number of operations in ONLINE mode. The main advantage of this mode is that we can create / change index and keep on working with the data (including changing these data) at the same time.This happens due to the fact that schema lock (Sch-M) is not retained throughout creation / changing process. Here you can find a more complete list of options supported by different versions:

Forrards
March 30, 2023
SQL Server Enterprise Edition Advanced Scanning

It is widely known that SQL Server Enterprise Edition contains a range of improvements, which under certain conditions allow you to perform operations in a more optimal way in comparison with Standard Edition. One of these improvements is Advanced Scanning, which allows multiple scans to share one physical read from the disk. You can also come across another name of this feature - Merry-go-Round Scan.

Forrards
March 30, 2023
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How to convert to Base64 and backwards via T-SQL

I want to share my way to convert a string to Base64 and back. Let me note that presented method is not the fastest, but it has one important advantage - it works OOB, without CLR functions. We need a test database and a table to use as an example:

Forrards
March 18, 2023
Performance and using of VARCHAR boxes as filters in SSRS reports

Very few people have thought about this performance killer. It is all about report parameter of text type.The initial situationThere was a table with about 45 million rows. Some columns in the table were VARCHAR and should have been filtered. As a result of filtering by 10 different parameters the total number of rows could have been significantly reduced. SQL Server was going for table scan in this case. Also there was a number of indexes defined on the table.

Forrards
March 18, 2023

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