Creating Webhooks on a MySQL Table?

If you need to create a webhook on a MySQL table, having a field that marks the last modification date of any record, can be a great start

ALTER TABLE  my_table
ADD COLUMN modified DATETIME ON UPDATE CURRENT_TIMESTAMP,
ADD INDEX IX_modified (modified);

Keep Performing,
Moshe Kaplan

How to Prepare Your MySQL Slave to be Promoted to Master?

 Just a few steps, but make sure you do them on peacetime, as during downtime every minute counts.

1. Enable bin log, you will need them when you will want to add new slaves to the promoted master.

log_bin                = /var/log/mysql/mysql-bin.log
expire_logs_days        = 10
max_binlog_size        = 100M
binlog_format = mixed

2. Copy Master nodes users and permissions from the Master to the Slave

MASTER> mysqldump -uUSER -p -t mysql user > /tmp/dump.sql
SLAVE> mysql -uUSER -p -D mysql < /tmp/dump.sql
SLAVE> mysql -uUSER -p -e "FLUSH PRIVILEGES;"

P.S Consider using Galera as a Multi-Master solution to avoid the need to promote a node manually. However, in some cases, such as a delayed slave or hidden one, that might be the right solution.

Keep Performing,
Moshe Kaplan