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Millions of tiny databases

The Morning Paper

Millions of tiny databases , Brooker et al., It takes you through the thinking processes and engineering practices behind the design of a key part of the control plane for AWS Elastic Block Storage (EBS): the Physalia database that stores configuration information. Engineering decisions involve making lots of trade-offs.

Database 106
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Designing Instagram

High Scalability

When the server receives a request for an action (post, like etc.) from a client it performs two parallel operations: i) persisting the action in the data store ii) publish the action in a streaming data store for a pub-sub model. When the server receives a request for an action (post, like etc.) High Level Design. Architecture.

Design 334
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New Metadata-Only Column Changes in SQL Server 2016

SQL Performance

Along with a large number of restrictions on what is even possible with this command, there is always the question of performance. When we ask SQL Server to change some aspect of a column's definition, it needs to check that the existing data is compatible with the new definition. Improvements in SQL Server 2016. ( SELECT.

Servers 63
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SQL Server On Linux: Forced Unit Access (Fua) Internals

SQL Server According to Bob

SQL Server relies on Forced-Unit-Access (Fua) I/O subsystem capabilities to provide data durability, detailed in the following documents: SQL Server 2000 I/O Basic and SQL Server I/O Basics, Chapter 2. Be sure to deploy SQL Server 2017 CU6 or newer for best data durability and performance results. “.

Servers 90
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SQL Server Linux: fsync and Buffered I/O

SQL Server According to Bob

I was asked to validate the SQL Server behavior in light of the error condition involving fsync/fdatasync outlined in this article. Assume the database application opens the backup file, allowing file system caching (~_O_DIRECT.) SQL Server does NOT do this, in fact I made sure SQL Server on Linux does not allow this to occur.

Servers 40
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SQL Server on Linux: Why Do I Have Two SQL Server Processes

SQL Server According to Bob

When starting SQL Server on Linux why are there two (2) sqlservr processes? systemctl status mssql-server mssql-server.service – Microsoft SQL Server Database Engine … CGroup: /system.slice/mssql-server.service ??85829 The Linux, sqlservr, WATCHDOG can perform a similar role.

Servers 40
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SQL Server on IoT Edge and Developer Machines – Smaller Footprint

SQL Server According to Bob

SQL Server will ship Azure SQL Database Edge: [link]. With the announcement I can tell you more about one of the things we have been working on; SQL Server running on IoT Edge and Developer machines in under 500MB of memory. The effort focuses attention on memory usage and disk space requirements of SQL Server.

IoT 61