On 6/23/20 6:32 AM, Jason Ralph wrote:
Hello List,
PostgreSQL 11.8 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.4.7
20120313 (R
ed Hat 4.4.7-23), 64-bit
I am planning an update on a table with 20Million records, I have been
researching the best practices. I will remove all indexes and foreign
keys prior to the update, however I am not sure if I should use a
transaction or not.
My thought process is that a transaction would be easier to recover if
something fails, however it would take more time to write to the WAL log
in a transaction.
Unless this is an UNLOGGED table WALs will be written.
Would it make sense to make a back up of the table then execute update
without a transaction? How would you guys do it?
You could break it down into multiple transactions if there is way to
specify ranges of records.
Thanks,
*Jason Ralph*
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