Logging Protocols

For this topic we'll hear from Andy Pavlo one last time. Here's some terminology he uses you may not be familiar with:

• SIGSEGV (pronounced sig-sev): is an abbreviation for segmentation violation, which is the signal Unix-based operating systems send to process that encounters a segmentation fault. So "encountering a SIGSEGV" means getting a segmentation fault.
• Spinning disk hardware: older disk drives (hard disk drives or HDDs) stored data on a number of magnetic platters. These drives would spin a platter and have an arm or needle that would read data off of it. The more modern solid state drives (SSDs) do not have these moving parts (hence solid state).
  • A region of a platter of an HDD is referred to as a sector
• Context switch: when threads/processes/transactions are running concurrently and we switch from executing one to executing another, that is a context switch.
• fsync: A Linux function for flushing a file to disk

a couple notes about timestamps:

• the video below starts at 5:23.
• the material on shadow paging is optional, so you can skip from 28:40 to 41:34.