Question 1

What permissions are needed to use a sequence?

Accepted Answer

To call NEXTVAL, you need USAGE privilege on the sequence. To create or alter a sequence, you need CREATE SEQUENCE or ownership on the schema. Sequences inherit schema-level grants like other schema objects.

Question 2

How does sequence caching work in Snowflake?

Accepted Answer

Snowflake caches sequence values by default (cache size 20). This improves performance for high-frequency NEXTVAL calls. Cached values are lost on server restart, creating larger gaps. Set NO CACHE for gap-minimized sequences at the cost of performance.

Question 3

Can I reset a sequence to a specific value?

Accepted Answer

Use ALTER SEQUENCE seq_name SET VALUE = n to reset. The next NEXTVAL call returns n + increment. Alternatively, CREATE OR REPLACE the sequence with a new START value to fully reset it.

Question 4

Are sequences transaction-safe?

Accepted Answer

NEXTVAL calls are not transactional. Once a value is consumed, it is never reissued, even if the transaction rolls back. This guarantees uniqueness at the cost of potential gaps.

Snowflake 시퀀스 FAQ

시퀀스를 사용하려면 어떤 권한이 필요한가요?

Snowflake에서 시퀀스 캐싱은 어떻게 작동하나요?

시퀀스를 특정 값으로 재설정할 수 있나요?

시퀀스는 트랜잭션에 안전한가요?