Daniel Lemire

FEBRUARY 8, 2019

I believe that all optimizing C/C++ compilers know how to pull this trick and it is generally beneficial irrespective of the processor’s architecture. In concrete terms, here is the C code to compute the remainder of the division by some fixed divisor d : uint32_t d =. ; // your divisor > 0. Can we do better?

C++ 279

C++ Benchmarking Hardware Testing 279

SQL Performance

JULY 1, 2021

These types are on the deprecated list for many reasons, and have held a permanent spot on that list since being replaced by the max types way back in SQL Server 2005. name , [ Column ] = c. name , [ Data Type ] = TYPE_NAME ( c. system_type_id <> c. THEN N' (' + TYPE_NAME ( c.

C++ 58

C++ Database Servers Performance 58

SQL Performance

AUGUST 12, 2020

T-SQL supports it starting with SQL Server 2005. For example, you can use a query that is based on derived tables as the inner query of a CTE definition, as in the following example: WITH C AS. ( ) SELECT orderyear , numcusts FROM C ; However, the same does not hold true for a query that is based on CTEs. CROSS JOIN. (

C++ 140

C++ Code Design Database 140

Rigor

JANUARY 13, 2020

Steve Souders, plus Dion Almaer, Doug Crockford, Ben Galbraith, Tony Gentilcore, Dylan Schiemann, Stoyan Stefanov, Nicole Sullivan, Nicholas C. You only have a few seconds to get compelling content onto the screen. Fail, and you can kiss your customers and profits goodbye.” ” – Andy King, 2003. Even Faster Websites.

Performance 75

Performance Social Media Website Website Performance 75

SQL Performance

OCTOBER 9, 2019

Using a cursor, you would normally use code similar to the following: DECLARE @dbname AS sysname ; DECLARE C CURSOR FORWARD_ONLY STATIC READ_ONLY FOR. databases ; OPEN C ; FETCH NEXT FROM C INTO @dbname ; WHILE @@FETCH_STATUS = 0. databases ; OPEN @C ; FETCH NEXT FROM @C INTO @dbname ; WHILE @@FETCH_STATUS = 0.

C++ 111

C++ Database Servers Code 111

SQL Performance

AUGUST 1, 2022

75 Test XYZ Student C 55 Test XYZ 77.5 75 Test XYZ Student C 55 Test XYZ 77.5 If you’re using T-SQL to compute percentiles as part of your work, these functions should be familiar to you since they’ve been supported in SQL Server 2005 and later. 75 Test XYZ Student D 55 Test XYZ 77.5 75 Test XYZ Student H 65 Test XYZ 77.5

Servers 142

Servers Testing C++ Code 142

All Things Distributed

SEPTEMBER 20, 2013

The first practical modern implementation is probably C-Store by Stonebraker, et al. Combined with the rise of data warehouse workloads, where there is often significant redundancy in the values stored in columns, and database models based on column oriented storage took off.

Storage 87

Storage Hardware Cache C++ 87