PG_STAT_ALL_INDEXES

PG_STAT_ALL_INDEXES displays statistics about all accesses to a specific index in the current database.

Indexes can be used via either simple index scans or "bitmap" index scans. Bitmap scans can combine the output of multiple indexes using AND or OR rules, but combining independent row fetching with specific indexes is challenging. Consequently, a bitmap scan increases the index count in pg_stat_all_indexes.idx_tup_read and the table count in pg_stat_all_tables.idx_tup_fetch, while having no effect on pg_stat_all_indexes.idx_tup_fetch.

**Table 1** PG_STAT_ALL_INDEXES columns
Name	Type	Description
relid	oid	OID of the indexed table
indexrelid	oid	OID of this index
schemaname	name	Name of the schema this index is in
relname	name	Name of the indexed table
indexrelname	name	Name of this index
idx_scan	bigint	Number of index scans initiated on this index
idx_tup_read	bigint	Number of index entries returned by scans on this index
idx_tup_fetch	bigint	Number of live table rows fetched by simple index scans using this index