Faster database indexes (straight from the docs)
31:26
You don't need NoSQL (use MySQL)
36:03
Easy database indexing strategies
17:32
RAND is too slow (in MySQL)
41:50
Things every developer absolutely, positively needs to know about database indexing - Kai Sassnowski
13:46
Faster geospatial queries in MySQL
13:39
Faster than a regular database index
13:20
Pagination in MySQL - offset vs. cursor
11:22