How to shrink size of Linux EBS volume in AWS
If you over-allocated the size of EBS volume for EC2 instance, it may seem to be a problem to downsize it because Amazon Web Services don’t offer this operation, which is understandable. Suppose you allocated 30 Gb just in case, and it turned out that your data actually take about only 4Gb. Taking into account […]
Read MoreData Normalization
Best practice of the database design for OLTP (transactional) databases is to have all data at least in the 3rd normal form. After some hands-on experience developers design tables right in the 3RD NF. But in case of any difficulties, it can be done iteration by iteration via following the rules: 1st Normal Form First […]
Read MoreRenaming Primary Keys to Standard
We prefer to name all primary key constraints explicitly and not let SQL server come up with its own names. In this case: We always know what name to look for. Standard name, which in our case looks like PK_tableName, simplifies automatic maintenance of primary keys: if all names are standard, they can be used […]
Read MoreINCLUDE Clause in Non-clustered Indexes
Summary: improve performance of you queries by including hot data into index If you have a big table, let’s say with 100 columns and million rows, and some of those 100 columns, say 5 of them are being used in queries very often, you may significantly improve performance by building a special non-clustered index with […]
Read MoreUsing a DDL trigger to control and automate history of data changes
Summary: DDL trigger does all the magic of automatic support of historical data, all you need is to run the script against your database (once). After that you can turn history on tables on, off, or pause it. It will keep audit of all schema changes in your database and automatically generate DML triggers on […]
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