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SET RW_IMPLICIT_FLUSH

The RW_IMPLICIT_FLUSH configuration option controls the behavior of implicit flushes after batch operations.

Syntax

SET RW_IMPLICIT_FLUSH = { true | false };

Purpose

The FLUSH command commits any pending data changes and forces RisingWave to persist updated data to storage, which guarantees subsequent reads can access the latest data. See details in FLUSH.

However, when the RW_IMPLICIT_FLUSH option is enabled, explicit use of the FLUSH command is not required in most cases, as data changes are implicitly flushed and made visible after batch operations.

Behavior

  • When RW_IMPLICIT_FLUSH is set to true,

    • Data changes through INSERT, UPDATE, and DELETE are implicitly flushed and made visible after batch operations.
    • RisingWave ensures that data consistency and visibility are maintained similar to traditional databases, where read-after-write guarantees are provided.
  • When RW_IMPLICIT_FLUSH is set to false (default behavior),

    • RisingWave does not guarantee read-after-write consistency — a write may not be visible to subsequent reads immediately.
    • You need to call FLUSH explicitly after batch operations to immediately persist the changes to storage.

Example

-- Enable RW_IMPLICIT_FLUSH
SET RW_IMPLICIT_FLUSH TO true;

-- Perform batch operations
INSERT INTO users (id, name) VALUES (1, 'Alice'), (2, 'Bob'), (3, 'Charlie');
UPDATE users SET name = 'David' WHERE id = 2;
DELETE FROM users WHERE id = 3;

-- Data changes are implicitly flushed and immediately visible
SELECT * FROM users;
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