On 2024-07-05 18:58:21 +0530, Krishnakant Mane wrote: > I have decided to use materialised views (more precisely IVM ). [...] > Given this setup I have a very specific questionh. > > if client 1 has asked for his balance sheet and the view is being queried, > then what will happen if client 2 happens to create an invoice concurrently? > > Will the invoice creation (and subsequent voucher table and view update ) > wait for client 1 to complete the select query, or will the select query > halt till the update happen?
If I understand https://github.com/sraoss/pg_ivm correctly, the materialized view will be updated within the same transaction. So it's just the same as any other change in the database: Neither client will wait for the other. The first client will see either the old or the new state depending on whether the second client manages to commit soon enough. hp -- _ | Peter J. Holzer | Story must make more sense than reality. |_|_) | | | | | h...@hjp.at | -- Charles Stross, "Creative writing __/ | http://www.hjp.at/ | challenge!"
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