Answer
Indexing improves data retrieval speed by avoiding full table scans.
Indexes act like optimized search maps that help SQL Server locate rows faster.
However, too many indexes slow down write performance due to maintenance overhead.
Quick Answer
Indexing lets SQL Server find rows without reading the entire table. Instead of scanning a million rows, it jumps to the right spot using the index structure (B-tree). Without good indexes, even simple lookups turn into full table scans that waste CPU, memory, and time.
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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.
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Source: SugharaIQ