43 lines
1.4 KiB
SQL
43 lines
1.4 KiB
SQL
--
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-- PARALLEL
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--
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-- Serializable isolation would disable parallel query, so explicitly use an
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-- arbitrary other level.
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begin isolation level repeatable read;
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-- encourage use of parallel plans
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set parallel_setup_cost=0;
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set parallel_tuple_cost=0;
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set min_parallel_table_scan_size=0;
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set max_parallel_workers_per_gather=4;
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--
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-- Test write operations that has an underlying query that is eligble
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-- for parallel plans
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--
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explain (costs off) create table parallel_write as
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select length(stringu1) from tenk1 group by length(stringu1);
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create table parallel_write as
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select length(stringu1) from tenk1 group by length(stringu1);
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drop table parallel_write;
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explain (costs off) select length(stringu1) into parallel_write
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from tenk1 group by length(stringu1);
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select length(stringu1) into parallel_write
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from tenk1 group by length(stringu1);
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drop table parallel_write;
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explain (costs off) create materialized view parallel_mat_view as
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select length(stringu1) from tenk1 group by length(stringu1);
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create materialized view parallel_mat_view as
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select length(stringu1) from tenk1 group by length(stringu1);
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drop materialized view parallel_mat_view;
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prepare prep_stmt as select length(stringu1) from tenk1 group by length(stringu1);
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explain (costs off) create table parallel_write as execute prep_stmt;
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create table parallel_write as execute prep_stmt;
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drop table parallel_write;
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rollback;
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