GP - check if the db server is up

SQL= SELECT COUNT(*) FROM gp_toolkit.gp_pgdatabase_invalid;

SQL= SELECT * FROM gp_toolkit.gp_pgdatabase_invalid;

SQL= 
SELECT time as \"Timestamp\", dbid as \"DB Id\", \"desc\" as \"Description of change\" 
FROM gp_configuration_history
WHERE dbid IN (SELECT dbid FROM gp_segment_configuration WHERE status='d') 
ORDER BY time desc;

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