partition data - range, list, hash

Author: ptyadana

Advanced SQL for Query Tuning and Performance Optimization/04.Partitioning_Data.sql

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+/************ Partitioning Data ***************/
+
+---------- Partition by Range ---------------------------
+
+/* creat new table with partition table (with partition key) */
+CREATE TABLE iot_measurement(
+	location_id INT NOT NULL,
+	measure_date DATE NOT NULL,
+	temp_celcius INT,
+	rel_humidity INT
+) PARTITION BY RANGE(measure_date);
+
+/* If we check iot_measurement table > Partitions > we will see No Nodes yet, because none has been created */
+
+/* Create partition Nodes and add to the original table */
+
+CREATE TABLE iot_measurement_week1_2019 PARTITION OF iot_measurement
+FOR VALUES FROM ('2019-01-01') TO ('2019-01-08');
+
+CREATE TABLE iot_measurement_week2_2019 PARTITION OF iot_measurement
+FOR VALUES FROM ('2019-01-08') TO ('2019-01-15');
+
+CREATE TABLE iot_measurement_week3_2019 PARTITION OF iot_measurement
+FOR VALUES FROM ('2019-01-15') TO ('2019-01-22');
+
+
+/* 
+If we check iot_measurement table > Partitions > we will see created 3 Nodes.
+Now, we can create constraints, indexes, triggers on each node.
+Notice that there is no columns, because columns are inherited from Parent Table.
+*/
+
+
+---------- Partition by List ---------------------------
+
+/* create table with partition by list */
+CREATE TABLE products(
+	product_id INT NOT NULL,
+	product_name TEXT NOT NULL,
+	product_short_desc TEXT NOT NULL,
+	product_long_desc TEXT NOT NULL,
+	product_category VARCHAR NOT NULL
+)PARTITION BY LIST(product_category);
+
+/* create partitions nodes */
+CREATE TABLE product_clothing PARTITION OF products
+	FOR VALUES IN('casual_clothing', 'business_attire', 'formal_clothing');
+	
+CREATE TABLE product_electronics PARTITION OF products
+	FOR VALUES IN('mobile_phones', 'tablets', 'laptop_computers');
+	
+CREATE TABLE product_kitchen PARTITION OF products
+	FOR VALUES IN ('food_processors', 'cutlery', 'blenders');
+
+
+
+---------- Partition by Hash ---------------------------
+
+/* create table with partition by hash */
+CREATE TABLE customer_interaction(
+	cid INT NOT NULL,
+	ci_url TEXT NOT NULL,
+	time_at_url INT NOT NULL,
+	click_sequence INT NOT NULL
+)PARTITION BY HASH(cid);
+
+/* 
+Create partitions nodes 
+As we want 5 partitions, we will use Modulus of 5.
+*/
+-- for first partition, every customer id divided by 5 with remainder of getting 0 will be put into this block of partition.
+CREATE TABLE customer_interaction_1 PARTITION OF customer_interaction
+FOR VALUES WITH (MODULUS 5, REMAINDER 0);
+
+CREATE TABLE customer_interaction_2 PARTITION OF customer_interaction
+FOR VALUES WITH (MODULUS 5, REMAINDER 1);
+
+CREATE TABLE customer_interaction_3 PARTITION OF customer_interaction
+FOR VALUES WITH (MODULUS 5, REMAINDER 2);
+
+CREATE TABLE customer_interaction_4 PARTITION OF customer_interaction
+FOR VALUES WITH (MODULUS 5, REMAINDER 3);
+
+CREATE TABLE customer_interaction_5 PARTITION OF customer_interaction
+FOR VALUES WITH (MODULUS 5, REMAINDER 4);