osc使用一则

1.使用前备份

mysqldump -uroot -p fission_statistics room_break_history >
room_break_history_20170704.dump

2.pt-osc执行DDL

pt-online-schema-change –user=’root’ –host=’localhost’ –ask-pass
–alter “CHANGE break_type break_type INT(11) NOT NULL,CHANGE app_id
app_id INT(11) NOT NULL,CHANGE room_id room_id INT(11) NOT
NULL,CHANGE from_user_id from_user_id INT(11) NOT NULL,CHANGE
to_user_id to_user_id INT(11) NOT NULL,CHANGE content_type
content_type INT(11) NOT NULL,CHANGE source_message source_message
VARCHAR(1536) CHARSET utf8mb4 COLLATE utf8mb4_general_ci NOT
NULL,CHANGE send_message send_message VARCHAR(1536) CHARSET utf8mb4
COLLATE utf8mb4_general_ci NOT NULL,CHANGE request_type request_type
INT(4) NOT NULL,CHANGE handle_type handle_type INT(11) NOT NULL,CHANGE
handle_uid handle_uid INT(11) NOT NULL,CHANGE create_time
create_time DATETIME NOT NULL,DROP INDEX idx_from_user_id,ADD  INDEX
idx_handle_time (handle_type, create_time)”
D=fission_statistics,t=room_break_history –execute

3.只输出测试结果

./bin/pt-online-schema-change –user=’root’ –host=’localhost’
–ask-pass -S /tmp/mysql.sock –alter “ADD  INDEX idx_from_user_id
(from_user_id,room_id,handle_type, create_time)”
D=fission_statistics,t=room_break_history –dry-run –print

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