What are the main performance differences between varchar and nvarchar SQL Server data types?

Disk space is not the issue… but memory and performance will be. Double the page reads, double index size, strange LIKE and = constant behaviour etc Do you need to store Chinese etc script? Yes or no… And from MS BOL “Storage and Performance Effects of Unicode” Edit: Recent SO question highlighting how bad nvarchar … Read more

What column type/length should I use for storing a Bcrypt hashed password in a Database?

The modular crypt format for bcrypt consists of $2$, $2a$ or $2y$ identifying the hashing algorithm and format a two digit value denoting the cost parameter, followed by $ a 53 characters long base-64-encoded value (they use the alphabet ., /, 0–9, A–Z, a–z that is different to the standard Base 64 Encoding alphabet) consisting … Read more

AWS EFS vs EBS vs S3 (differences & when to use?) [closed]

One word answer: MONEY 😀 1 GB to store in US-East-1: (Updated at 2016.dec.20) Glacier: $0.004/Month (Note: Major price cut in 2016) S3: $0.023/Month S3-IA (announced in 2015.09): $0.0125/Month (+$0.01/gig retrieval charge) EBS: $0.045-0.1/Month (depends on speed – SSD or not) + IOPS costs EFS: $0.3/Month Further storage options, which may be used for temporary … Read more

What’s the difference between CharField and TextField in Django?

It’s a difference between RDBMS’s varchar (or similar) — those are usually specified with a maximum length, and might be more efficient in terms of performance or storage — and text (or similar) types — those are usually limited only by hardcoded implementation limits (not a DB schema). PostgreSQL 9, specifically, states that “There is … Read more

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