Hi, ALL, On the page https://www.postgresql.org/docs/current/runtime-config-query.html#GUC-SEQ-PAGE-COST
it is only given the default value of this parameter. No min/max values are provided.. The same can be sad about https://www.postgresql.org/docs/current/runtime-config-query.html#GUC-RANDOM-PAGE-COST However, this page https://www.postgresql.org/docs/current/runtime-config-resource.html#GUC-EFFECTIVE-IO-CONCURRENCY describes both default and mn/max, however t s says: [quote] The default is 1 on supported systems, otherwise 0 [/quote]] No explanation of what is "supported system" is given... And the same can be said about https://www.postgresql.org/docs/current/runtime-config-resource.html#GUC-MAINTENANCE-IO-CONCURRENCY. Thank you
