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Provide possibility to alter table add column without exclusive lock on the table to enable 24x7 deployment with zero downtime for real-time applications.
Possible solution can be done in a same way as online DDL in innodb. (https://dev.mysql.com/doc/refman/5.6/en/innodb-online-ddl.html).
System: Banking cards requests authorization system Use case for the system: - Calculate balance - Check account existance - authorize card transaction (24x7 mode) for all customers Proposed Scenario: - New feature has to be added to the system - Run alter table add column without stopping system jobs as no need for exclusive access for add column. - Change system programs and restart system jobs using blue/green deployment.
Scenario without RFE: - New feature has to be added to the system - Stop system jobs to remove table locks which will make system unavailable - run alter table add column - change system programs - Start System jobs
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