On Sat, Sep 28, 2019 at 10:22:28PM -0300, Alvaro Herrera wrote: > I always thought that create index concurrently was prevented from > running concurrently in a table by the ShareUpdateExclusive lock that's > held during the operation.
REINDEX CONCURRENTLY and CIC can deadlock while waiting for each other to finish after their validation phase, see: https://www.postgresql.org/message-id/20190507030756.gd1...@paquier.xyz https://www.postgresql.org/message-id/20190507032543.gh1...@paquier.xyz -- Michael
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