MongoDB updateOne changes one document, and its result object shows how many documents matched and how many changed. This post tests $set, $inc, updateMany, upserts and the replaceOne mistake that wipes every other field.
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MongoDB find: Filters, Projections and Sorting for SQL People
MongoDB find returns the documents that match a filter. This post tests find, findOne, $gt, $in, $and, $or, projection, sort, limit and countDocuments on 18 grocery products, each next to its SQL equivalent.
MongoDB insertOne and insertMany: Adding Documents the Right Way
MongoDB insertOne adds a document and insertMany adds a list. This post tests both with a unique index, a generated _id and a duplicate key in the middle of a batch, comparing ordered: true with ordered: false and showing what landed.
Getting Started With mongosh: Databases, Collections and Documents
mongosh is the shell that connects you to MongoDB. This post connects, creates a database and a collection on the first write, and stores a document. It explains the _id, the BSON types and the habits that surprise SQL Server people.
How to Know Backup Speed in SQL Server? – Interview Question of the Week #277
Question: How to Know Backup Speed in SQL Server?
Answer: It is very simple to know the backup speed in SQL Server. Let us discuss today.
HAS_DBACCESS Function: List the Databases You Can Open
The HAS_DBACCESS function tells you whether the current login can open a database. One query over sys.databases turns it into a list, and this post tests six databases to show what each zero means: no user, offline, restricted or a busy single user slot.
Memory-Optimized TempDB Tables: List Them and Check Status
Memory-optimized TempDB tables are the system tables that SQL Server 2019 and later can keep in memory. This post shows two queries: one that checks whether the feature is on, and one that lists the tables it covers. It also explains the limits that come with the feature.
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