8.120. slon_node_health_check()

Function Properties

Language: PLPGSQL

Return Type: boolean

called when slon starts up to validate that there are not problems with node configuration. Returns t if all is OK, f if there is a problem.

declare
		prec record;
		all_ok boolean;
begin
		all_ok := 't'::boolean;
		-- validate that all tables in sl_table have:
		--      sl_table agreeing with pg_class
		for prec in select tab_id, tab_relname, tab_nspname from
		sl_table t where not exists (select 1 from pg_catalog.pg_class c, pg_catalog.pg_namespace n
				where c.oid = t.tab_reloid and c.relname = t.tab_relname and c.relnamespace = n.oid and n.nspname = t.tab_nspname) loop
				all_ok := 'f'::boolean;
				raise warning 'table [id,nsp,name]=[%,%,%] - sl_table does not match pg_class/pg_namespace', prec.tab_id, prec.tab_relname, prec.tab_nspname;
		end loop;
		if not all_ok then
		   raise warning 'Mismatch found between sl_table and pg_class.  Slonik command REPAIR CONFIG may be useful to rectify this.';
		end if;
		return all_ok;
end