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This article is the fourth installment in a series about T-SQL bugs, pitfalls and bestpractices. The focus of this month's article is bugs, pitfalls and bestpractices related to window functions. In our query plan, we have exactly two rows written to the spool per underlying row, so SQL Server uses the in-memory spool.
This article is the fifth part in a series about T-SQL bugs, pitfalls and bestpractices. Here I'll describe the trap, the potential bug, and a bestpractice that prevents the bug. Previously I covered determinism , subqueries , joins and windowing. This month I cover pivoting and unpivoting. 830 rows affected).
This article is the third installment in a series about T-SQL bugs, pitfalls and bestpractices. Some of the bugs and bestpractices that I cover here are a result of a survey I did among fellow MVPs. All of these bugs are related to T-SQL querying fundamentals, and are easy to avoid if you follow simple best-practices.
This blog was originally published in October 2017 and was updated in September 2023. Sharding in MongoDB is a technique used to distribute a database horizontally across multiple nodes or servers, known as “shards.” MongoDB distributes data across these shard servers to ensure an even distribution.
Recognized as the fastest growing database by popularity, PostgreSQL was named the DBMS of the year in both 2018 and 2017 by DB-Engines, and continues to grow in popularity in 2019. PostgreSQL is an open source object-relational database system with over 30 years of active development. In fact, PostgreSQL is so popular, 11.5%
We’re no longer living in an age where large companies require only physical servers, with similar and rarely changing configurations, that could be manually maintained in a single Datacenter. Treating these different processes as code will ensure that bestpractices are followed. Dynatrace news.
SQL Server is designed to scale across the spectrum of small machines to enterprise class servers. The changes made in SQL Server2017 CU4 improve resource usage on smaller machines, such as a VM or Container used for testing and development. It is a bestpractice keep the setting above 128.
How fast is the average time to first byte (server delay)? In 2017, mobile internet usage passed desktop as the majority. Google’s bestpractice is to have a speed index under 3 seconds. Google’s bestpractice is to be below 0.5 How long is the average server delay? seconds on mobile.
Many database administrators find themselves having to support instances of SQL Server Reporting Services (SSRS), or at least the backend databases that are required for SSRS. These topics apply to both SQL Server Reporting Services as well as Power BI Report Server. Installation and support of SSRS can be confusing.
As a bestpractice, if you know that an attribute is not supposed to allow NULLs, make sure you enforce it with a NOT NULL constraint as part of the column definition. WHERE NOT ( shippeddate = '20190102' ) ; This query returns the following output: orderid shippeddate -- -- 10249 2017-07-10 10252 2017-07-11 10250 2017-07-12.
Task Distribution in Web Servers In web applications experiencing high traffic levels, it is crucial to allocate tasks effectively to avoid overwhelming the servers. As a potent message broker, RabbitMQ is pivotal in spreading tasks among various web servers to maintain equilibrium and optimize efficiency. RabbitMQ in Action.
This server is spending about a third of its CPU cycles just checking the time! Amazon even provides an official [recommendation] (2021): "For EC2 instances launched on the AWS Xen Hypervisor, it's a bestpractice to use the tsc clock source. 30.14% in the middle of the flame graph.
Microsoft engineering is actually sending quite a few folks over the Atlantic to come talk about SQL Server2017, SQL Server on Linux, GDPR, Performance, Security, Azure Data Lake, Azure SQL Database, Azure SQL Data Warehouse, and Azure CosmosDB. Bestpractices on Building a Big Data Analytics Solution – Michael Rys.
In general terms, to achieve HA in PostgreSQL, there must be: Redundancy: To ensure data redundancy and provide continuous performance when a primary server fails, multiple copies of the database reside in replica servers. When the primary server fails, a standby server takes over as the new primary.
A 2017 study by Akamai says as much when it found that even a 100ms delay in page load can decrease conversions by 7% and lose 1% of their sales for every 100ms it takes for their site to load which, at the time of the study, was equivalent to $1.6 It’s is a Google service that audit things performance, accessibility, SEO, and bestpractices.
This server is spending about a third of its CPU cycles just checking the time! Amazon even provides an official [recommendation] (2021): "For EC2 instances launched on the AWS Xen Hypervisor, it's a bestpractice to use the tsc clock source. 30.14% in the middle of the flame graph.
This blog was originally published in July 2017 and was updated in August 2023. KEY partitioning KEY partitioning is similar to HASH partitioning, except that only one or more columns to be evaluated are specified, and the MySQL server provides its own hashing function. So, What is MySQL Partitioning?
To provide some coherence to the music, I decided to use Taylor Swift songs since her discography covers the time span of most papers that I typically read: Her main albums were released in 2006, 2008, 2010, 2012, 2014, 2017, 2019, 2020, and 2022. This choice also inspired me to call my project Swift Papers.
According to Monetate , the following conversion rate results were gathered for Q3 of 2017 until Q3 of 2018. With a CDN, you can offload your static assets such as product images, videos, GIFs, CSS files, and much more to the CDN’s edge servers. Conversion rates will vary based on industry, location, and device used.
Is it worth exploring tree-shaking, scope hoisting, code-splitting, and all the fancy loading patterns with intersection observer, server push, clients hints, HTTP/2, service workers and — oh my — edge workers? Long FMP usually indicates JavaScript blocking the main thread, but could be related to back-end/server issues as well.
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