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Updates for Learned Indexes, NULLs are equal in DISTINCT but unequal in UNIQUE, fsyncgate & SERIAL is non-transactional. #4

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Updates for Learned Indexes, NULLs are equal in DISTINCT but unequal in UNIQUE, fsyncgate & SERIAL is non-transactional. #4

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8f137af
Learned Indexes
christoshrousis Aug 27, 2023
34195d2
NULLs are equal in DISTINCT but inequal in UNIQUE
christoshrousis Aug 27, 2023
55566da
fsyncgate
christoshrousis Aug 27, 2023
778f54a
SERIAL is non-transactional
christoshrousis Aug 27, 2023
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8 changes: 4 additions & 4 deletions README.md
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Expand Up @@ -101,14 +101,14 @@ If you're replicating SQL databases, whether MySQL, Postgres, or SQL Server, [ch

- Concepts
- database cracking: *explanation needed*
- learned indexes: *explanation needed*
- learned indexes: https://www.postgresql.org/message-id/CAFcOn28TpR4oydF1NdMEuKFVVRiRwAwG4dGunu2kVxHZw3ViEA%40mail.gmail.com
- XTID exhaustion: *explanation needed*
- Worst Case Optimal Join: *explanation needed*
- Volcano model: *explanation needed*
- Battle Scars
- Vectorized doesn't mean SIMD: *explanation needed*
- join ordering is NP hard: *explanation needed*
- NULLs are equal in DISTINCT but inequal in UNIQUE: *explanation needed*
- NULLs are equal in DISTINCT but inequal in UNIQUE: https://modern-sql.com/feature/is-distinct-from


## Level 7
Expand All @@ -117,7 +117,7 @@ If you're replicating SQL databases, whether MySQL, Postgres, or SQL Server, [ch
- dee and dum: https://blog.jooq.org/creating-tables-dum-and-dee-in-postgresql/
- the Halloween problem: https://en.wikipedia.org/wiki/Halloween_Problem
- allballs: https://www.postgresql.org/message-id/24526.1106597936%40sss.pgh.pa.us
- fsyncgate: *explanation needed*
- fsyncgate: https://wiki.postgresql.org/wiki/Fsync_Errors
- Every SQL operator is actually a JOIN: *explanation needed*
- SERIAL is non-transactional: *explanation needed*
- SERIAL is non-transactional: https://www.postgresql.org/docs/current/datatype-numeric.html#DATATYPE-SERIAL
- NULL (?): *explanation needed*