How to set cluster level PostgreSQL config parameters?

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[Question posted by a user on YugabyteDB Community Slack ]

How to set cluster level PostgreSQL config parameters?

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This is done by using the ysql-pg-conf gflag in yb-tserver configuration: yb-tserver configuration reference | YugabyteDB Docs.

ysql_pg_conf takes a comma-separated list of tunables that would go in pg_conf in PostgreSQL.

An example command is if we want to set enable_hashagg=false:

./bin/yb-tserver [--master-addresses, --fs_data_dirs ...] --ysql_pg_conf="enable_hashagg=false"