View table index fragmentation and rebuild index

rebuild_index.sql

SELECT a.index_id, name, avg_fragmentation_in_percent
FROM sys.dm_db_index_physical_stats (DB_ID(N'my_db'), OBJECT_ID(N'dbo.my_table'), NULL, NULL, NULL) AS a
JOIN sys.indexes AS b ON a.object_id = b.object_id AND a.index_id = b.index_id;

ALTER INDEX idx_myIndex ON my_table
REBUILD WITH (FILLFACTOR = 80);