mirror of
https://github.com/Microsoft/sql-server-samples.git
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319 lines
7.1 KiB
Transact-SQL
319 lines
7.1 KiB
Transact-SQL
----------------------------------------------
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-- Perf Improvements - ASCII - 1 byte per char
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----------------------------------------------
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USE master;
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DROP DATABASE IF EXISTS LatinDatabase;
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CREATE DATABASE LatinDatabase COLLATE LATIN1_GENERAL_100_CI_AS_SC_UTF8
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GO
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USE LatinDatabase
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GO
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--------------------------------------
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-- INSERTs
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--------------------------------------
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DROP TABLE IF EXISTS dbo.Inserts_UTF16
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CREATE TABLE dbo.Inserts_UTF16(
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ID int IDENTITY(1,1) NOT NULL PRIMARY KEY
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, col1 NVARCHAR(50) NOT NULL)
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GO
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DROP TABLE IF EXISTS dbo.Inserts_UTF8
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CREATE TABLE dbo.Inserts_UTF8(
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ID int IDENTITY(1,1) NOT NULL PRIMARY KEY
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, col1 VARCHAR(50) NOT NULL)
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GO
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DROP TABLE IF EXISTS dbo.Inserts_UTF16_Compressed
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CREATE TABLE dbo.Inserts_UTF16_Compressed(
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ID int IDENTITY(1,1) NOT NULL PRIMARY KEY
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, col1 NVARCHAR(50) NOT NULL)
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WITH (DATA_COMPRESSION = PAGE)
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GO
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DROP TABLE IF EXISTS dbo.Inserts_UTF8_Compressed
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CREATE TABLE dbo.Inserts_UTF8_Compressed(
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ID int IDENTITY(1,1) NOT NULL PRIMARY KEY
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, col1 VARCHAR(50) NOT NULL)
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WITH (DATA_COMPRESSION = PAGE)
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GO
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-- INSERT perf UTF16: 37s
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SET NOCOUNT ON;
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BEGIN TRAN
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DECLARE @i int = 1, @start datetime
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SELECT @start = GETDATE()
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WHILE @i < 1000000
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BEGIN
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INSERT INTO dbo.Inserts_UTF16 (col1)
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SELECT REPLICATE(CONCAT(
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25)))
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), 5);
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SET @i += 1
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END;
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SELECT DATEDIFF(s, @start, GETDATE()) AS 'Inserts_UTF16'
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COMMIT
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GO
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-- INSERT perf UTF8: 34s
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SET NOCOUNT ON;
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BEGIN TRAN
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DECLARE @i int = 1, @start datetime
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SELECT @start = GETDATE()
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WHILE @i < 1000000
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BEGIN
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INSERT INTO dbo.Inserts_UTF8 (col1)
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SELECT REPLICATE(CONCAT(
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25)))
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), 5);
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SET @i += 1
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END;
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SELECT DATEDIFF(s, @start, GETDATE()) AS 'Inserts_UTF8'
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COMMIT
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GO
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-- INSERT perf UTF16 Compressed: 40s
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SET NOCOUNT ON;
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BEGIN TRAN
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DECLARE @i int = 1, @start datetime
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SELECT @start = GETDATE()
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WHILE @i < 1000000
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BEGIN
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INSERT INTO dbo.Inserts_UTF16_Compressed (col1)
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SELECT REPLICATE(CONCAT(
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25)))
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), 5);
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SET @i += 1
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END;
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SELECT DATEDIFF(s, @start, GETDATE()) AS 'Inserts_UTF16_Compressed'
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COMMIT
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GO
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-- INSERT perf UTF8 Compressed: 38s
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SET NOCOUNT ON;
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BEGIN TRAN
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DECLARE @i int = 1, @start datetime
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SELECT @start = GETDATE()
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WHILE @i < 1000000
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BEGIN
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INSERT INTO dbo.Inserts_UTF8_Compressed (col1)
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SELECT REPLICATE(CONCAT(
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25)))
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), 5);
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SET @i += 1
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END;
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SELECT DATEDIFF(s, @start, GETDATE()) AS 'Inserts_UTF8_Compressed' -- 34s
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COMMIT
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GO
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------------------------------------
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-- SELECTs
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------------------------------------
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USE [LatinDatabase];
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GO
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-- Recreate tables
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DROP TABLE IF EXISTS dbo.Inserts_UTF16
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CREATE TABLE dbo.Inserts_UTF16(
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ID int IDENTITY(1,1) NOT NULL PRIMARY KEY
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, col1 NVARCHAR(50) NOT NULL)
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GO
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DROP TABLE IF EXISTS dbo.Inserts_UTF8
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CREATE TABLE dbo.Inserts_UTF8(
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ID int IDENTITY(1,1) NOT NULL PRIMARY KEY
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, col1 VARCHAR(50) NOT NULL)
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GO
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DROP TABLE IF EXISTS dbo.Inserts_UTF16_Compressed
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CREATE TABLE dbo.Inserts_UTF16_Compressed(
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ID int IDENTITY(1,1) NOT NULL PRIMARY KEY
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, col1 NVARCHAR(50) NOT NULL)
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WITH (DATA_COMPRESSION = PAGE)
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GO
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DROP TABLE IF EXISTS dbo.Inserts_UTF8_Compressed
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CREATE TABLE dbo.Inserts_UTF8_Compressed(
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ID int IDENTITY(1,1) NOT NULL PRIMARY KEY
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, col1 VARCHAR(50) NOT NULL)
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WITH (DATA_COMPRESSION = PAGE)
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GO
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-- Insert same data set to all tables
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-- UTF16
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SET NOCOUNT ON;
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BEGIN TRAN
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DECLARE @i int = 1, @start datetime
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SELECT @start = GETDATE()
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WHILE @i < 1000000
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BEGIN
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INSERT INTO dbo.Inserts_UTF16 (col1)
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SELECT REPLICATE(CONCAT(
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25))),
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CHAR(FLOOR(65 + (RAND() * 25)))
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), 5);
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SET @i += 1
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END;
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COMMIT
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GO
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-- UTF8
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SET NOCOUNT ON;
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BEGIN TRAN
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INSERT INTO dbo.Inserts_UTF8 (col1)
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SELECT col1 FROM dbo.Inserts_UTF16
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COMMIT
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GO
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-- UTF16 Compressed
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SET NOCOUNT ON;
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BEGIN TRAN
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INSERT INTO dbo.Inserts_UTF16_Compressed (col1)
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SELECT col1 FROM dbo.Inserts_UTF16
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COMMIT
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GO
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-- UTF8 Compressed
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SET NOCOUNT ON;
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BEGIN TRAN
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INSERT INTO dbo.Inserts_UTF8_Compressed (col1)
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SELECT col1 FROM dbo.Inserts_UTF16
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COMMIT
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GO
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-- Check data record sizes
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-- Note data length sizes are the same whether compressed or not
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SELECT TOP 1 DATALENGTH(col1) AS [DataLength_UTF16]
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FROM Inserts_UTF16
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GO
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SELECT TOP 1 DATALENGTH(col1) AS [DataLength_UTF8]
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FROM Inserts_UTF8
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GO
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-- Check table sizes
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-- Highlights: UTF8 uncompressed is close to UTF16 compressed.
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-- UTF8 compressed doesn't get much further as expected.
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SELECT OBJECT_NAME(p.OBJECT_ID) AS TableName,
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p.ROWS AS NumRows, a.used_pages, a.total_pages,
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CONVERT(DECIMAL(19,2),ISNULL(a.used_pages,0))*8/1024 AS DataSizeMB
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FROM sys.allocation_units a
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INNER JOIN sys.partitions p ON p.hobt_id = a.container_id
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AND OBJECT_NAME(p.OBJECT_ID) LIKE 'Inserts%'
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ORDER BY TableName
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GO
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-- Simple Read perf
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SET STATISTICS IO, TIME ON
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GO
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DBCC DROPCLEANBUFFERS
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GO
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/*
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SSMS:
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CPU 171 ms
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Elapsed 1982 ms
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Reads 14893 + 14523
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SQLCMD:
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CPU ms
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Elapsed ms
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Reads
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*/
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SELECT * FROM Inserts_UTF16
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-- WHERE ID BETWEEN 5000 AND 12500
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WHERE col1 LIKE 'P%'
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GO
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DBCC DROPCLEANBUFFERS
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GO
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/*
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SSMS:
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CPU 266 ms
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Elapsed 703 ms
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Reads 8787 + 8365
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SQLCMD:
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CPU ms
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Elapsed ms
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Reads
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*/
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SELECT * FROM Inserts_UTF8
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-- WHERE ID BETWEEN 5000 AND 12500
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WHERE col1 LIKE 'P%'
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GO
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DBCC DROPCLEANBUFFERS
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GO
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/*
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SSMS:
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CPU 423 ms
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Elapsed 662 ms
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Reads 8367 + 7964
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SQLCMD:
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CPU ms
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Elapsed ms
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Reads
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*/
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SELECT * FROM Inserts_UTF16_Compressed
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-- WHERE ID BETWEEN 5000 AND 12500
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WHERE col1 LIKE 'P%'
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GO
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DBCC DROPCLEANBUFFERS
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GO
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/*
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SSMS:
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CPU 371 ms
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Elapsed 664 ms
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Reads 8238 + 7235
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SQLCMD:
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CPU ms
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Elapsed ms
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Reads
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*/
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SELECT * FROM Inserts_UTF8_Compressed
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-- WHERE ID BETWEEN 5000 AND 12500
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WHERE col1 LIKE 'P%'
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GO
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SET STATISTICS IO, TIME OFF
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GO |