Why do two counts of the same table disagree? Five tiny demos show NULL, blank text, LEFT JOIN placeholders, bigint and join multiplication.
SQL Server emergency? Email pinal@sqlauthority.com with URGENT in the subject line.
Ten Plan Operators Explained: An Operator Cheat Sheet
Seek, scan, lookup, three joins, sort, aggregate, spool and parallelism, each shown with a tiny demo. Learn to judge a plan by rows and executions.
SQL SERVER – Find Untrusted Foreign Key
An Untrusted Foreign key has not validated all existing rows. A customer bulk-load history prompted this inventory.
RESOURCE_SEMAPHORE vs THREADPOOL: Two Waits, Two Fixes
RESOURCE_SEMAPHORE vs THREADPOOL tells you whether a task waits for memory or for a worker thread. This post reads both counters and checks for live waits. A demo shows how an index shrinks a memory grant from 38,216 KB to zero.
Index Build Speed: Which Rebuild Settings Change the Time
Index build speed depends on rebuild or reorganize, MAXDOP, ONLINE, SORT_IN_TEMPDB and the recovery model. This post times each choice on a million row table and measures the log under each recovery model. It shows which one changes the clock and which changes only the log.
Forwarded Records, Multiple Backup and SSMS – SQL in Sixty Seconds – Feb 2021
This month’s SQL in Sixty Seconds topics were Forwarded Records, Multiple Backup and SSMS. Here are the videos released in Feb 2021.
SQL SERVER – Get Column Names
I Get Column names using a schema-qualified table and a defined column order. The four methods use corrected filters.
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