Scylla's upcoming Secondary Indexes provides the same user-visible interface as Apache Cassandra's Secondary Indexes but overcomes the scalability limitations usually associated with Cassandra's Secondary Indexes. In this talk, we'll focus on the key characteristics of Scylla's Secondary Indexes highlighting the trade-offs involved. The talk will also provide users with examples and best practices.

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CREATE TABLE users (
userid uuid,
name text,
email text,
country text,
PRIMARY KEY (userid)
);

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SELECT * FROM users
WHERE email = ‘user@example.com’

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CREATE TABLE users (
userid uuid,
name text,
email text,
country text,
PRIMARY KEY (userid)
);

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SELECT * FROM users
WHERE email = ‘user@example.com’

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CREATE INDEX ON users (email);

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CREATE TABLE users_email_index (
email text,
userid uuid,
PRIMARY KEY (email)
);

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SELECT *
FROM users
WHERE
email =
‘user@example.com’

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SELECT userid
FROM
users_email_index
WHERE
email =
‘user@example.com’

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SELECT *
FROM users
WHERE
userid IN
<userids>

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