[Pgsql-ayuda] Monitoreo con pg_stat_activity

[Guillermo Schulman]

Hola a todos.
Necesito monitorear las conexiones existentes en determinado servidor. Por 
lo que estuve leyendo en esta lista, estoy utilizando lo siguiente:

dbtest=> select * from pg_stat_activity order by procpid;

   datid   |     datname      | procpid | usesysid | usename | current_query
-----------+------------------+---------+----------+---------+--------------
536047581 | test_database1   |     332 |      100 | pictage |
520023417 | test_database2   |     335 |      100 | pictage |
520023417 | test_database2   |     338 |      100 | pictage |
553919440 | test_database3   |     428 |      100 | pictage |
520023417 | test_database2   |     431 |      100 | pictage |
536047781 | test_database4   |     478 |      100 | pictage |
536047581 | test_database1   |     481 |      100 | pictage |
536047581 | test_database1   |     616 |      100 | pictage |
536047581 | test_database1   |     751 |      100 | pictage |
536047581 | test_database1   |     771 |      100 | pictage |
536047781 | test_database4   |     805 |      100 | pictage |
536047781 | test_database4   |     818 |      100 | pictage |
553919404 | test_database5   |     828 |      100 | pictage |
520023417 | test_database2   |     835 |      100 | pictage |
520023417 | test_database2   |     908 |      100 | pictage |
553919433 | stage_database6  |     910 |      100 | pictage |
520023417 | test_database2   |     951 |      100 | pictage |
553919440 | test_database3   |     954 |      100 | pictage |
553919440 | test_database3   |     955 |      100 | pictage |
536047781 | test_database4   |     961 |      100 | pictage |
536047581 | test_database1   |     966 |      100 | pictage |
520023417 | test_database2   |     972 |      100 | pictage |
553919440 | test_database3   |     973 |      100 | pictage |
553919404 | test_database5   |     981 |      100 | pictage |
553919440 | test_database3   |    1015 |      100 | pictage |
553919440 | test_database3   |    1182 |      100 | pictage |
553919440 | test_database3   |    1183 |      100 | pictage |
536047581 | test_database1   |    1195 |      100 | pictage |
553919440 | test_database3   |    1196 |      100 | pictage |
536047781 | test_database4   |    1206 |      100 | pictage |
520023417 | test_database2   |    1207 |      100 | pictage |
536047581 | test_database1   |    1208 |      100 | pictage |
520023417 | test_database2   |    1224 |      100 | pictage |
520023417 | test_database2   |    1225 |      100 | pictage |
670615972 | test_database7   |   31872 |      100 | pictage |
536047781 | test_database4   |   32183 |      100 | pictage |
536047781 | test_database4   |   32491 |      100 | pictage |

Preguntas: por qué obtengo el mismo datid para distintas conexiones? Hay 
alguna documentación buena acerca de esta tabla para entender claramente 
cada columna?

Gracias.

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