A catalog is a grouping of all the information in an organized manner. It facilitates you in understanding the current status and then helps you in making informed decisions.
Similarly, Postgres System Catalog is a window to what all is going on with the Database. It contains metadata about all the databases and objects in the cluster. Reading and interpreting the information in the systems catalogs can provide vital insights into the overall health of the cluster allowing us time to take preventive actions before things come to a head.
During the talk, we will have a look at some of the most valuable catalog tables which provide us with trends important from a maintenance and performance point of view. We will also try to provide answers on “Which” catalogs to use, “What” info they provide and “How” to make sense of this information to come up with a relevant action.