Backport ClickHouse#92009 to 25.8: Fix flaky 00906_low_cardinality_cache

Author: robot-clickhouse

tests/queries/0_stateless/00906_low_cardinality_cache.sql

@@ -2,7 +2,7 @@
 
 SET max_rows_to_read = '100M', max_execution_time = 600;
 drop table if exists lc_00906;
-create table lc_00906 (b LowCardinality(String)) engine=MergeTree order by b SETTINGS index_granularity = 8192, index_granularity_bytes = '10Mi';
-insert into lc_00906 select '0123456789' from numbers(100000000);
+create table lc_00906 (b LowCardinality(String)) engine=MergeTree order by b SETTINGS index_granularity = 8192, index_granularity_bytes = '10Mi', vertical_merge_algorithm_min_rows_to_activate=100000000;
+insert into lc_00906 select '0123456789' from numbers(100000000) SETTINGS max_insert_threads=6, max_threads=4;
 select count(), b from lc_00906 group by b;
 drop table if exists lc_00906;