Hi all,  I have a migration where I ·        Add a new nullable column to a table ·        update almost every row in this big table (8 million rows) from another table where I set this new column  I have also a replication setup running. The database has a size of around 20GB. While the migration is running, it more than doubles is size and fills up all space. Then the migration fails and is rolled back.  What is the best way of keeping this from happening? My current idea is to lock both tables completely from access (the queried and the updated one) so that postgresql does not have to ensure isolation for concurrent queries by keeping a copy of each row. Is my thinking here correct?  Thanks in advance and Best Regards, Daniel This message may contain confidential and privileged information. If it has been sent to you in error, please reply to advise the sender of the error and then immediately permanently delete it and all attachments to it from your systems. If you are not the intended recipient, do not read, copy, disclose or otherwise use this message or any attachments to it. The sender disclaims any liability for such unauthorized use. PLEASE NOTE that all incoming e-mails sent to PDF e-mail accounts will be archived and may be scanned by us and/or by external service providers to detect and prevent threats to our systems, investigate illegal or inappropriate behavior, and/or eliminate unsolicited promotional e-mails (â??spamâ??). If you have any concerns about this process, please contact us at legal.department@xxxxxxx. |
