Redis Sorted Sets: ZCARD

Redis ZCARD Command

Redis ZCARD command is used to return the number of elements stored in the set at specified key.

Here are some common uses and scenarios for the "ZCARD" command:

• Size Retrieval: Determine the cardinality (number of elements) of a sorted set.
• Data Validation: Validate the presence and size of sorted sets for consistency and correctness.
• Capacity Monitoring: Monitor the size of sorted sets to manage memory and performance.
• Conditional Logic: Execute operations based on the size of a sorted set.
• Resource Management: Manage resources by tracking the size of sorted sets for optimization.

Syntax:

ZCARD KEY_NAME

Available since

1.2.0.

Return Value

Integer replies the cardinality (number of elements) of the sorted set, or 0 if the key does not exist.

Return Value Type

Integer

Example: Redis ZCARD

127.0.0.1:6379> ZADD mycolorset 10 white 12 black 14 red 16 blue
(integer) 4
127.0.0.1:6379> ZADD mycolorset 18 green 20 orange 22 pink 24 yellow
(integer) 4
127.0.0.1:6379> ZCARD mycolorset
(integer) 8
127.0.0.1:6379>

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