I tried creating the following tables on 2 servers:
// Master
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CREATE DATABASE IF NOT EXISTS test;
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CREATE TABLE IF NOT EXISTS test.test_data (
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id INT,
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content VARCHAR(255),
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PRIMARY KEY (id)
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) ENGINE=INNODB;
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INSERT INTO test.test_data
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VALUES
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(1, "Test 01"),
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(2, "Test 02");
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// Slave
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CREATE DATABASE IF NOT EXISTS test;
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CREATE TABLE IF NOT EXISTS test.test_data (
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id INT,
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content VARCHAR(255)
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) ENGINE=CONNECT TABLE_TYPE=MYSQL OPTION_LIST='connect=server_connect'
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SRCDEF='SELECT id, content FROM test.test_data WHERE %s';
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CREATE TABLE IF NOT EXISTS test.test_trigger (
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id INT,
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content VARCHAR(255),
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PRIMARY KEY (id)
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) ENGINE=INNODB;
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DELIMITER //
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DROP TRIGGER IF EXISTS test.after_test_trigger;
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//
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CREATE TRIGGER test.after_test_trigger
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AFTER INSERT ON test.test_trigger
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FOR EACH ROW
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BEGIN
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SET @test_content = (
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SELECT td.content
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FROM test.test_data td
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WHERE
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td.id = NEW.id
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);
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END //
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INSERT INTO test.test_trigger
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VALUES
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(1, "Test 01"),
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(2, "Test 02");
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I've attached general log below. You'll find only the last statement that quit this connection "208", the rest won't. Therefore, when I update 200 rows, it exceeds 200 connections and show error "Too many connections".
Thanks.
- duplicates
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MDEV-23673
CONNECT Engine - (1040) Too many connections when running in trigger
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Closed
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How can you make 200 updates on a table having only 2 rows?