WebNov 5, 2024 · In these cases, here are some other popular ways to measure your query. 1. TempDB spills – some query plan operations require memory in order to run. Ideally, SQL Server grants enough memory for the query’s operations to happen completely in RAM. When that doesn’t happen, operators like sorts will have a yellow bang on them, and … WebMar 28, 2024 · The Brent Ozar Unlimited® blog covers SQL server news and free SQL Server training tips about clustering, AlwaysOn, performance tuning, T-SQL, and more. ... 14:30 SwedeDBA: Hi Brent, I have a friend that is searching for unused indexes on a DB in an availability group with readable secondaries. He wonders if the result from …
[Video] Office Hours: Ask Me Anything About SQL Server - Brent Ozar ...
WebDec 1, 2024 · SELECT * FROM PHONE_BOOK WHERE LAST_NAME = 'OZAR' But if you don't know someone's last name, and you ask for this: SELECT * FROM PHONE_BOOK WHERE FIRST_NAME = 'BRENT' Then you're going to be scanning the entire phone book looking for me. The first column in the index is incredibly important. Web1 Answer Sorted by: 25 With SQL Server 2005, you can use the dynamic management view sys.dm_db_index_usage_stats. The name says "index" but that's a little misleading - every table has an entry in here, even if it doesn't have any indexes. Here's a useful query from SQL Magazine: elkay watersentry vii replacement filter
[Video] Office Hours 2024/03/26 (With Transcriptions) - Brent Ozar ...
WebSep 22, 2024 · The query that uses the nonclustered ColumnStore index does a typical Key Lookup. It’s able to (1) scan the ColumnStore index in Batch mode, (2) pass those rows to a Nested Loops join, and then (3) … WebMar 15, 2024 · Brent Ozar. I make Microsoft SQL Server go faster. I've been working with SQL Server since the late 1990s, and I'm one of the rare Microsoft Certified Masters of SQL Server. I love teaching, travel, and laughing. I live in Las Vegas, Nevada. WebMar 26, 2024 · This week, Erik and Richie discuss truncating log files, reindexing, using sp_rename, query tuning, columnstore indexes, debugging parameter sniffing issues, query processing internals, and troubleshooting query performance issues. Here’s the video on YouTube: You can register to attend next week’s Office Hours, or subscribe to our … forchange xiamen inc