Added information about statistics collector (#13)

mfvanek · Dec 17, 2019 · d14e58c · d14e58c
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 1. Tables with missing indexes ([sql](https://github.com/mfvanek/pg-index-health/blob/master/src/main/resources/sql/tables_with_missing_indexes.sql)).
 1. Tables without primary key ([sql](https://github.com/mfvanek/pg-index-health/blob/master/src/main/resources/sql/tables_without_primary_key.sql)).
 
+## Important note
+**pg_index_health** uses the [Statistics Collector](https://www.postgresql.org/docs/10/monitoring-stats.html).  
+You can call `pg_stat_reset()` to reset all statistics counters for the current database to zero.
+
 ## Demo application
 ```java
 import com.mfvanek.pg.connection.HighAvailabilityPgConnection;