Geo-proximity with sorted sets in Redis - Cheat Sheet & Quick Revision

Recall & Review

beginner

What Redis data structure is used to store geo-location data for proximity queries?

Redis uses sorted sets to store geo-location data, where each member has a score representing its longitude and latitude encoded as a geohash.

beginner

Which Redis command adds a geo-location point to a sorted set?

The GEOADD command adds a geo-location point to a sorted set with longitude, latitude, and a member name.

intermediate

How does Redis find members within a radius of a point?

Redis uses the GEORADIUS command to find members within a specified radius from a given longitude and latitude, optionally sorting results by distance.

intermediate

What does the WITHDIST option do in a GEORADIUS query?

The WITHDIST option returns the distance of each member from the center point along with the member name.

advanced

Why are sorted sets suitable for geo-proximity queries in Redis?

Sorted sets store members with scores that represent geohashes, allowing efficient range queries and sorting by distance for geo-proximity searches.

Which Redis command adds a location to a geo set?

A GEOADD

B GEOGET

C GEORADIUS

D GEOSEARCH

The GEOADD command adds a geo-location point to a sorted set.

What does the GEORADIUS command return by default?

A Members within radius without distances

B All members in the sorted set

C Members within radius sorted by distance

D Distances only

By default, GEORADIUS returns members within the radius without distances unless WITHDIST is specified.

Which option returns distances with members in a GEORADIUS query?

A WITHCOORD

B WITHDIST

C WITHHASH

D ASC

WITHDIST returns the distance of each member from the center point.

What type of score does Redis use internally for geo members in sorted sets?

A Random number

B Timestamp

C Geohash encoded score

D Member name length

Redis encodes longitude and latitude into a geohash score for sorting.

Which command can replace GEORADIUS in newer Redis versions for geo queries?

A GEODIST

B GEOADD

C GEOPOS

D GEOSEARCH

GEOSEARCH is a newer command that supports geo queries with more flexible options.

Explain how Redis uses sorted sets to perform geo-proximity queries.

Think about how locations are stored and how you find nearby points.

Describe the steps to find all locations within 5 kilometers of a point using Redis commands.

Focus on adding data first, then querying with radius.