ClickHouse/dbms/tests/queries/0_stateless/01019_Buffer_and_max_memory_usage.sql

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DROP TABLE IF EXISTS null_;
DROP TABLE IF EXISTS buffer_;
CREATE TABLE null_ (key UInt64) Engine=Null();
CREATE TABLE buffer_ (key UInt64) Engine=Buffer(currentDatabase(), null_,
1, /* num_layers */
0, /* min_time */
86400,/* max_time */
0, /* min_rows */
100e9,/* max_rows */
0, /* min_bytes */
20e6 /* max_bytes */
);
-- note that there is untracked_memory_limit (4MB) in MemoryTracker
SET max_memory_usage=10e6;
SET min_insert_block_size_bytes=9e6;
INSERT INTO buffer_ SELECT toUInt64(number) FROM system.numbers LIMIT 10e6; -- { serverError 241 }
OPTIMIZE TABLE buffer_; -- flush
SET min_insert_block_size_bytes=1e6;
INSERT INTO buffer_ SELECT toUInt64(number) FROM system.numbers LIMIT 10e6;