indexes

mdrozdov/clickhouse/secondary_index.sql

@@ -0,0 +1,65 @@
+--task 1
+create table mdrozdov.logs3
+on CLUSTER clickhouse_cluster (
+	log_id Int,
+    ts DateTime
+)
+engine = ReplicatedMergeTree(
+		'/clickhouse/tables/{shard}/mdrozdov/logs3',
+		'{replica}'
+	)
+order by ts
+
+alter table mdrozdov.logs3
+add index idx_ts ts type minmax GRANULARITY 2;
+
+select *
+from mdrozdov.logs3
+where ts between '2024-06-02' and '2024-06-03'
+
+SELECT 
+    query, 
+    read_rows, 
+    result_rows, 
+    read_bytes
+FROM system.query_log
+WHERE query LIKE '%logs%'
+ORDER BY event_time DESC
+LIMIT 1;
+
+-- task 2
+create table mdrozdov.clicks
+on CLUSTER clickhouse_cluster (
+	id UInt64,
+    country String
+)
+engine = ReplicatedMergeTree(
+		'/clickhouse/tables/{shard}/mdrozdov/clicks',
+		'{replica}'
+	)
+order by id
+
+alter table mdrozdov.clicks
+add index idx_country type set(100) GRANULARITY 2
+
+Explain
+    select *
+    from mdrozdov.clicks
+    where country = 'RU'
+
+-- task 3
+create table mdrozdov.users
+on CLUSTER clickhouse_cluster (
+	id UInt64,
+    email String
+)
+engine = ReplicatedMergeTree(
+		'/clickhouse/tables/{shard}/mdrozdov/users',
+		'{replica}'
+	)
+order by id
+
+ALTER TABLE users 
+ADD INDEX idx_email email TYPE bloom_filter(0.01) GRANULARITY 2;
+
+SELECT * FROM users WHERE email = 'alice@mail.com';