Quick Answer
Top indexing mistakes: too many indexes (slows writes, wastes space), wrong leading column (index unused), missing covering columns (causes key lookups), ignoring fill factor (causes page splits), never maintaining fragmentation, and duplicate indexes that the optimizer ignores while still costing maintenance overhead.
These increase I/O, fragmentation, and reduce plan efficiency.
S
SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
