Memory used by each table is the number of its pages in the buffer pool times 8 KB. This post adds them up with sys.dm_os_buffer_descriptors, shows why a plain division by 128 hides small tables, and compares the cached pages with the pages each table owns on disk.
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Buffer Pool Pages for One Table in SQL Server
Buffer pool pages for one table show how much of one table sits in memory right now. This post lists them by index, page type and page level with sys.dm_os_buffer_descriptors, then shows which pages a seek, a scan and a large text read pull in. It uses the join that the documentation gives for each allocation unit type.
SQL SERVER – Fix Error: Currently This Report Does Not Have Any Data to Show, Because Default Trace Does Not Contain Relevant Information
If there is a way to fix the error which they get when they try to open Schema Changes History. The error was related to Not Have Any Data to Show.
SQL SERVER – Validating Positive Integer Strings with Explicit Boundaries
To Validate Natural integer strings, I define a nonempty positive ASCII-digit contract. A customer wanted a simpler validator.
How to Alter Index to Add New Columns in SQL Server? – Interview Question of the Week #278
Question: How to Alter Index to Add New Columns in SQL Server?
Answer: It is not possible to Alter Index definition to add or remove columns.
SQL to MongoDB: Mapping SELECT, WHERE, GROUP BY and JOIN
Moving from SQL to MongoDB is mostly a change of vocabulary plus a new way to join. This post maps SELECT, WHERE, ORDER BY, GROUP BY and JOIN to find, sort, $group and $lookup, and tests each one on a small vegetarian shop.
MongoDB deleteMany: The Empty Filter That Deletes Everything
MongoDB deleteMany removes every document that matches a filter, and an empty filter matches all of them. This post tests deleteOne, deleteMany, findOneAndDelete and the two quiet traps: a misspelled field and a filter built from an unset variable.
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