SQL · Theory

Master-Master Replication

Theory

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Master-Master Replication

If you can teach Master-Master Replication using Isha walking through Master-Master Replication, you know it. If you only know the heading, you don’t.

For Master-Master Replication, an index is in play. Don’t blame it until you have traced Isha walking through Master-Master Replication.

Master-Master Replication exists so Isha can keep Isha walking through Master-Master Replication correct in a first job task.

Use Master-Master Replication when Isha walking through Master-Master Replication must stay clear. If a simpler SQL step works, use that instead.

Master-Master Replication miss: only reciting the name of Master-Master Replication. Fix it before you talk about advanced SQL.

Place Master-Master Replication next to nearby SQL work — one Master-Master Replication step Isha can write from memory is the link.

Viva for Master-Master Replication: what it is → one Master-Master Replication step Isha can write from memory → the mistake (only reciting the name of Master-Master Replication).

Exam tip

For Master-Master Replication: definition + a first job task + one failure.

Master-Master Replication — sample query

-- Master-Master Replication
CREATE TABLE demo (
  id INTEGER PRIMARY KEY,
  label TEXT NOT NULL,
  qty INTEGER DEFAULT 0
);
INSERT INTO demo (id, label, qty) VALUES
  (1, 'alpha', 2),
  (2, 'beta', 5);
SELECT label, qty FROM demo WHERE qty >= 2 ORDER BY qty DESC;

Master-Master Replication: create two demo rows, then SELECT qty >= 2 ordered. Say which labels come back.

Short notes

DefMaster-Master Replication — Isha uses it for Isha walking through Master-Master Replication in a first job task.
RuleMaster-Master Replication → one Master-Master Replication step Isha can write from memory.
RememberMaster-Master Replication + an index (a first job task).
UseMaster-Master Replication in a first job task (Isha walking through Master-Master Replication).
TrapMaster-Master Replication — only reciting the name of Master-Master Replication.
ExMaster-Master Replication → Isha walking through Master-Master Replication.

-- Master-Master Replication CREATE TABLE demo ( id INTEGER PRIMARY KEY, label TEXT NOT NULL, qty INTEGER DEFAULT 0 ); INSERT INTO demo (id, label, qty) VALUES (1, 'alpha', 2), (2, 'beta', 5); SELECT label, qty FROM demo WHERE qty >= 2 ORDER BY qty DESC;

Master-Master Replication

Master-Master Replication — sample query

Short notes

Questions

Master-Master Replication

Master-Master Replication — sample query

Short notes

Questions