What does indexing mean in software engineering?

Indexing is the process of creating a data structure that maps values to their storage locations, enabling faster data retrieval. Think of it like a book index that lets you jump directly to the right page instead of reading every page. In databases, indexing on a column allows the system to find rows in milliseconds rather than scanning all rows.

How do you use indexing in a work sentence?

You can say: 'We need to add indexing to improve performance,' 'The indexing strategy helped reduce query time,' or 'Without proper indexing, the search feature is too slow.' Use it as a noun, typically after verbs like add, implement, apply, or improve.

What is the difference between indexing and an index?

An 'index' is the actual data structure created (singular or plural: 'indexes' or 'indices'). 'Indexing' is the process of creating and maintaining those indexes. Example: 'We performed indexing on three columns, which created three new indexes.'

When do engineers talk about indexing?

Engineers discuss indexing during database design, performance troubleshooting, code reviews, and infrastructure planning. It comes up when investigating slow queries, preparing for scaling, or optimizing search features.

Is indexing formal or informal language?

Indexing is neutral, technical language used in both formal documentation and casual team conversations. It is standard vocabulary in all tech workplaces across the US and UK.

indexing meaning in tech — Speak Tech English

Commonness	4/5
Versatility	4/5
Formality	CasualFormalNeutral
Spoken ↔ Written	SpokenWrittenBoth
Directness ↔ Diplomatic	DirectDiplomaticDirect
Region	US and UK

Say it like this

✓We need to improve our indexing strategy

✓Add indexing to speed up queries

✓The database is slow because we are missing key indexes

Real examples

in a standup

"Yesterday we identified that the user search was slow, so today we are implementing indexing on the email field."

in a code review

"Good catch on the N+1 query issue. We should add indexing to the foreign key columns to prevent this performance problem."

in a team meeting

"Database indexing alone will not solve our latency problem. We also need to optimize the query logic."

Don't say this

Handle with care. Do not confuse indexing (creating indexes) with simply accessing array elements by position. Also avoid using it as a verb in casual contexts without clear meaning.

✕We need to index the database.

✓We need to add indexing to the database.— Use 'add indexing' or 'implement indexing' as noun phrases rather than 'index the database' in formal tech contexts.

✕Indexing will fix all performance issues.

✓Indexing can improve query performance significantly, but other optimizations may also be needed.— Indexing is powerful but not a cure-all. Avoid overstating its benefits.

✕We indexed the table yesterday.

✓We added indexes to the table yesterday.— While 'indexed' is grammatically acceptable, tech professionals more commonly say 'added indexes' to be clearer about the action.

Other forms

noun

indexing

"Proper indexing is essential for database performance."

noun

index

"We created a composite index on user_id and created_date."

verb

index

"We need to index this table to speed up searches."

Often used with

add indexingUsed when implementing indexes: 'We should add indexing to improve performance.'

improve indexingUsed when optimizing existing indexes: 'We improved indexing by creating composite indexes.'

database indexingRefers specifically to indexes in relational databases.

search indexingUsed in context of search engines and full-text search systems.

indexing strategyThe overall approach to which columns or fields to index.

Similar words

index creationMore formal and explicit, used in technical documentation.

optimizationBroader term that includes indexing but also other performance improvements.

Opposites

full table scansequential search

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Practice

Try it

4 quick exercises

Complete the sentence

1. The database query was slow until we added _______ on the user_id column.

Pick the most natural phrasing

2. How would a senior engineer most likely suggest improving query speed?

We should apply indexing to the email field.We should index on the email field.We should create indexing on the email field.We should add indexes to the email column.

Spot the mistake

3. Which sentence uses indexing incorrectly?

Indexing improved our query performance by 40%.We added indexing to speed up user searches.The indexing strategy we chose works really good for our data.Without proper indexing, large tables become very slow.

Rewrite naturally

4. Rewrite this using indexing: 'The search function is slow because the database does not have organized data structures to find information quickly.'

Questions

Quick poll

Have you said "indexing" in a standup this week?

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