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Amazon Redshift
Database Developer Guide (API Version 2012-12-01)

Step 6: Recreate the Test Data Set

Now that you have chosen the sort keys and distribution styles for each of the tables, you can create the tables using those attributes and reload the data. You will allow the COPY command to analyze the load data and apply compression encodings automatically.

To Recreate the Test Data Set

  1. You need to drop the SSB tables before you run the CREATE TABLE commands.

    Execute the following commands.

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    drop table part cascade; drop table supplier cascade; drop table customer cascade; drop table dwdate cascade; drop table lineorder cascade;
  2. Create the tables with sort keys and distribution styles.

    Execute the following set of SQL CREATE TABLE commands.

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    CREATE TABLE part ( p_partkey integer not null sortkey distkey, p_name varchar(22) not null, p_mfgr varchar(6) not null, p_category varchar(7) not null, p_brand1 varchar(9) not null, p_color varchar(11) not null, p_type varchar(25) not null, p_size integer not null, p_container varchar(10) not null ); CREATE TABLE supplier ( s_suppkey integer not null sortkey, s_name varchar(25) not null, s_address varchar(25) not null, s_city varchar(10) not null, s_nation varchar(15) not null, s_region varchar(12) not null, s_phone varchar(15) not null) diststyle all; CREATE TABLE customer ( c_custkey integer not null sortkey, c_name varchar(25) not null, c_address varchar(25) not null, c_city varchar(10) not null, c_nation varchar(15) not null, c_region varchar(12) not null, c_phone varchar(15) not null, c_mktsegment varchar(10) not null) diststyle all; CREATE TABLE dwdate ( d_datekey integer not null sortkey, d_date varchar(19) not null, d_dayofweek varchar(10) not null, d_month varchar(10) not null, d_year integer not null, d_yearmonthnum integer not null, d_yearmonth varchar(8) not null, d_daynuminweek integer not null, d_daynuminmonth integer not null, d_daynuminyear integer not null, d_monthnuminyear integer not null, d_weeknuminyear integer not null, d_sellingseason varchar(13) not null, d_lastdayinweekfl varchar(1) not null, d_lastdayinmonthfl varchar(1) not null, d_holidayfl varchar(1) not null, d_weekdayfl varchar(1) not null) diststyle all; CREATE TABLE lineorder ( lo_orderkey integer not null, lo_linenumber integer not null, lo_custkey integer not null, lo_partkey integer not null distkey, lo_suppkey integer not null, lo_orderdate integer not null sortkey, lo_orderpriority varchar(15) not null, lo_shippriority varchar(1) not null, lo_quantity integer not null, lo_extendedprice integer not null, lo_ordertotalprice integer not null, lo_discount integer not null, lo_revenue integer not null, lo_supplycost integer not null, lo_tax integer not null, lo_commitdate integer not null, lo_shipmode varchar(10) not null );
  3. Load the tables using the same sample data.

    1. Open the loadssb.sql script that you created in the previous step.

    2. Delete compupdate off from each COPY statement. This time, you will allow COPY to apply compression encodings.

      For reference, the edited script should look like the following:

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      copy customer from 's3://awssampledbuswest2/ssbgz/customer' credentials 'aws_access_key_id=<Your-Access-Key-ID>;aws_secret_access_key=<Your-Secret-Access-Key>' gzip region 'us-west-2'; copy dwdate from 's3://awssampledbuswest2/ssbgz/dwdate' credentials 'aws_access_key_id=<Your-Access-Key-ID>;aws_secret_access_key=<Your-Secret-Access-Key>' gzip region 'us-west-2'; copy lineorder from 's3://awssampledbuswest2/ssbgz/lineorder' credentials 'aws_access_key_id=<Your-Access-Key-ID>;aws_secret_access_key=<Your-Secret-Access-Key>' gzip region 'us-west-2'; copy part from 's3://awssampledbuswest2/ssbgz/part' credentials 'aws_access_key_id=<Your-Access-Key-ID>;aws_secret_access_key=<Your-Secret-Access-Key>' gzip region 'us-west-2'; copy supplier from 's3://awssampledbuswest2/ssbgz/supplier' credentials 'aws_access_key_id=<Your-Access-Key-ID>;aws_secret_access_key=<Your-Secret-Access-Key>' gzip region 'us-west-2';
    3. Save the file.

    4. Execute the COPY commands either by running the SQL script or by copying and pasting the commands into your SQL client.

      Note

      The load operation will take about 10 to 15 minutes. This might be a good time to get another cup of tea or feed the fish.

      Your results should look similar to the following.

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      Warnings: Load into table 'customer' completed, 3000000 record(s) loaded successfully. ... ... Script execution finished Total script execution time: 12m 15s
    5. Record the load time in the benchmarks table.

      Benchmark Before After
      Load time (five tables) 10m 23s 12m 15s
      Storage Use
      LINEORDER 51024
      PART 384
      CUSTOMER 200
      DWDATE 160
      SUPPLIER 152
      Total storage 51920
      Query execution time
      Query 1 6.97
      Query 2 12.81
      Query 3 13.39
      Total execution time 33.17

Next Step

Step 7: Retest System Performance After Tuning