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Articles by Dbcc Traceon
Answering Questions On Dropped Columns
Howdy folks! Long time no write. In this article, I will be answering a couple of questions from the previous posts about dropping columns. A Quick Refresh If you haven't read the previous posts on this topic, here is the list: What happens when we drop a column on a SQL Server table? Where's my space? Identify Tables With Dropped Columns How much Space can I expect to recover from a rebuild after dropping a column?
Advanced SQL Server Page Forensics: Detecting Page Splits and Allocations with DBCC PAGE – SQLServerCentral
Introduction Page splits are one of those silent performance killers in SQL Server that many DBAs have heard about but rarely analyze in depth. On the surface, inserts might look harmless – rows keep getting added, queries return results, and no errors appear. But underneath, SQL Server is constantly managing how data is physically stored on 8KB pages, and each insert has the potential to fragment your index and degrade performance over time. Inserts at the end of a table generally work smoothly.
What happens when we drop a column on a SQL Server table? Where's my space? – SQLServerCentral
Short answer: The column is marked as 'deleted' and will stop being visible/usable. But, most importantly - The record/table size will remain unchanged. A metadata operation Dropping a column is a metadata/logical operation, not a physical one. This means that the data isn't removed/overwritten by this action. As Paul Randal mentions here: "the cost of that will be deferred for the inserters and not for the deleters". Sort of.
What Every DBA Should Know about Always On Readable Secondaries – SQLServerCentral
This article aims to demonstrate the lesser-known impact of Always On Readable secondaries. In this article, we will not be going into how readable secondaries are configured and how read-only connections are directed to readable secondaries. Instead, we will take a peek under the hood and see what is happening when it is already configured. It is important to note that readable secondaries uses snapshot isolation and that comes at a price.
SQLSERVER 阻塞之 PFS 页到底是什么？
一：背景 1. 讲故事 在 SQLSERVER 的众多阻塞场景中，有不小的一部分是由于 PFS 页上的 闩锁 等待造成的，毕竟写页操作一定是要串行化的，在面对 闩锁(PAGELATCH_X) 等待问题上，一定要搞明白 PFS 页到底是什么？ 这篇就来好好聊一聊。 二：PFS 详解 1.
Understanding CRUD Operations Against Heaps and Forwarding Pointers – SQLServerCentral
Introduction Data Manipulation Language (DML) transactions are the core of any workload that runs on SQL Server. A solid understanding of what happens under the covers when you run a DML statement is crucial to writing better-performing code. In this article, we dive into the internals of the three main DML statements against heaps: insert, update, and delete. We start by understanding what happens internally when each of the three DML statements runs against a heap.
Enable Trace Flags in SQL Server – SQLServerCentral
Trace flags are switches that adminstrators or developers can use to change the behavior of SQL Server. These are added by the development team, often to help debug or diagnose performance issues, according to BOL, but they are increasingly being used as feature flags to enable behavior that some customers may want, but Microsoft doesn't want to make the default. This article will look at various ways that you can enable trace flag behavior in SQL Server.
Minimal Logging - SQLServerCentral
Minimal logging involves logging only the information that is required to recover a transaction without supporting point-in-time recovery.Minimal logging is more efficient than full logging, and it reduces the possibility of bulk operations filling up transaction log. .To make high-volume data loading faster, SQL Server supports minimal logging. However, with minimal logging you cannot perform a point in time recovery for bulk operations.
Reading SQL Server's Transaction Log – SQLServerCentral
Introduction So you want to read the transaction log? The reasons for doing so are many and varied, so let me start by explaining my reasons. However, before I do let me first recognize some of the people who have helped me get to this point and apologize to any I may have missed. Thank you - Paul S. Randal, Kimberly Tripp, Nigel Rivett, Kalen Delaney, Rick Negrin, Isaac Kunen, Danny Gould and Kevvie Fowler.
Indexes and Fragmentation in SQL Server 2000 Part 1 – SQLServerCentral
I believe it's my academic background that has seen me develop the need to see the facts for myself before I feel confident about a particular subject. It has always been both a strength and a weakness of mine. On one hand it provides the motivation for me to tackle a subject I want to understand, but on the other I have been guilty of reinventing the wheel just so I can see it work for myself.
SQL Server 7: Some Useful Undocumented DBCC Commands – SQLServerCentral
Introduction Undocumented DBCC commands: DBCC BUFFER DBCC BYTES DBCC DBINFO DBCC DBTABLE DBCC DES DBCC HELP DBCC IND DBCC LOG DBCC PAGE DBCC PROCBUF DBCC PRTIPAGE DBCC PSS DBCC RESOURCE DBCC TAB Literature Introduction In this article I want to tell you about some useful undocumented DBCC commands, and how you can use these commands in SQL Server 7.0 for administering and monitoring. DBCC is an abbreviation of a DataBase Consistency Checker.
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