169.9K
COIndexes don’t store data faster.
They help you find data faster.
Without an index, the database checks every row.
With an index, it jumps directly to the answer.
That’s why reads become fast.
But every insert, update, or delete also updates the index —
which is why writes become slower.
Indexes are not free.
They’re a trade-off.
Good engineers don’t add indexes blindly.
They add them with intent.
Save this.
Interviewers love this topic.
#databases #sql #indexing #backendengineering #systemdesign softwareengineering developers performance
@codewithupasana
