Exadata HCC Case Study. - By Diwakar Kasibhotla Sr. Data Architect
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1 Exadata HCC Case Study - By Diwakar Kasibhotla Sr. Data Architect
2 About Diwakar Kasibhotla Works as Sr. Data Architect for OppenheimerFunds. 15 yrs. experience in Data warehouse implementations performing role of a Data Architect, Data Modeler, Performance Tuning, ETL/BI architecture Currently working as lead Architect for Exadata migrations at OppenheimerFunds. Author of blogsite
3 About OppenheimerFunds OppenheimerFunds is one of the nation s largest and most respected asset management companies. More than $192 billion in assets under management (As of April 30, 2011)
4 Agenda Objective Case Study Details Options for Exadata HCC HCC Limitations Using Compression Advisor Migrate existing tables/partitions/subpartitions to HCC Real life compression ratio Query Performance after using HCC Load Performance after using HCC Effect of sorting on HCC ratio Summary
5 Objective Evaluate Exadata new features like HCC to save disk space. Compare Load and Query performance before and after HCC with different options on Production data.
6 Case Study details Exadata Specs: ¼ rack, Single Instance Database (size 1TB), SATA drives Table specs: Name: COMP_TEST (Copy of Production table) Partitions: Daily Partitions (9 Partitions) Sub partitions: 10 Sub partitions for each partition (90 Sub Partitions) No Indexes Row count = 67,458,438 (Production Data)
7 Exadata HCC - Options Warehouse Compression Optimized for query performance COMPRESS FOR QUERY HIGH High Compression ratio without affecting query times but some load performance hit COMPRESS FOR QUERY LOW - Low compression ratio without affecting load times Archive Compression Optimized for Space COMPRESS FOR ARCHIVE HIGH - Very High Compression Ratio with slower query times. COMPRESS FOR ARCHIVE LOW High compression ration with slower query response times.
8 HCC Limitations To maximize storage savings with Exadata Hybrid Columnar Compression, data must be loaded using data warehouse bulk loading techniques. Insert statements with the APPEND hint Parallel DML Direct Path SQL*LDR Create Table as Select (CTAS) Before using HCC make sure that ETL is using Bulk Loading techniques
9 Compression Advisor The DBMS_COMPRESSION package provides an interface to facilitate choosing the correct compression level for an application. The package take a table as input and estimates the compression ration and resulting size in blocks if you compressed the table. We used DBMS_COMPRESSION.GET_COMPRESSION_RATIO procedure to estimate the compression ratio. GET_COMPRESSION_RATIO procedure creates 2 copies of your table (compressed and uncompressed) and calculates the ratio. To use this procedure there must be at least 1,000,000 rows in your table.
10 Using Compression Advisior DECLARE BEGIN END; blkcnt_comp PLS_INTEGER; blkcnt_uncmp PLS_INTEGER; row_comp PLS_INTEGER; row_uncm PLS_INTEGER; comp_ratio PLS_INTEGER; comp_type VARCHAR2(30); Possible Values dbms_compression.comp_for_query_high dbms_compression.comp_for_query_low dbms_compression.comp_for_archive_high dbms_compression.comp_for_archive_low dbms_compression.get_compression_ratio( DW, DW, COMP_TEST, NULL, dbms_compression.comp_for_query_high, blkcnt_comp, blkcnt_uncmp, row_comp, row_uncm, comp_ratio, comp_type); dbms_output.put_line( Block Count Compressed: TO_CHAR(blkcnt_comp)); dbms_output.put_line( Block Count UnCompressed: TO_CHAR(blkcnt_uncmp)); dbms_output.put_line( Row Count Per Block Compressed: TO_CHAR(row_comp)); dbms_output.put_line( Row Count Per Block UnCompressed: TO_CHAR(row_uncm)); dbms_output.put_line( Compression Ratio: TO_CHAR(comp_ratio)); dbms_output.put_line( Compression Type: comp_type);
11 Compression Advisor - Output SQL> / Compression Advisor self-check validation successful. select count(*) on both Uncompressed and EHCC Compressed format = rows Block Count Compressed: 2661 Block Count UnCompressed: 8481 Row Count Per Block Compressed: 376 Row Count Per Block UnCompressed: 117 Compression Ratio: 3 Compression Type: Compress For Query High
12 Migrate table data to HCC We can use 2 methods to migrate uncompressed data to HCC Using Datapump Step 1: Create Table structure to be compressed on the Exadata database with HCC option using impdp sqlfile option. Step 2: Unload data using DataPump this will compress the data during Direct path Load Alter Table move option after data is migrated to Exadata We can move existing uncompressed partitions/subpartitions to HCC by using Alter table statement SQL> alter table COMP_TEST move subpartition P _ACL compress for query high ; Note: You should drop or disable all the indexes before the move and create or enable them after the move.
13 Real life compression ratio Table size without HCC SQL> select round((sum(bytes)/1024/1024/1024),2) as size_gig from user_segments where segment_name = COMP_TEST ; SIZE_GIG Table size after HCC Compress for Query High SQL> select round((sum(bytes)/1024/1024/1024),2) as size_gig from user_segments where segment_name = COMP_TEST ; SIZE_GIG Table size after HCC Compress for Query Low SQL> select round((sum(bytes)/1024/1024/1024),2) as size_gig from user_segments where segment_name = COMP_TEST ; SIZE_GIG Table size after HCC - Compress for Archive High SQL> select round((sum(bytes)/1024/1024/1024),2) as size_gig from user_segments where segment_name = COMP_TEST ; SIZE_GIG Table size after HCC Compress for Archive Low SQL> select round((sum(bytes)/1024/1024/1024),2) as size_gig from user_segments where segment_name = COMP_TEST ; SIZE_GIG
14 Real life compression ratio - Summary Compression Type Advisor Compression Actual Compression QUERY HIGH QUERY LOW ARCHIVE HIGH ARCHIVE LOW NOTE: It took twice the amount time to compress an existing table using ARCHIVE HIGH
15 Query Performance on HCC tables Query used to check performance against uncompressed tables. SQL> select fu_key, fi_key, sum(period_1) from comp_test group by fu_key, fi_key; rows selected. Elapsed: 00:00:26.07
16 Query Performance on HCC tables Compression Type Timing in Seconds without HCC Timing in Seconds with HCC QUERY HIGH QUERY LOW ARCHIVE HIGH ARCHIVE LOW
17 Changes in ETL Process If you are using Partition Exchange to load data into your fact tables then you need to do the following changes to make sure that your new partitions are using HCC: Alter your stage table to use HCC. Load data into stage table using bulk load no change If you were not using bulk load then change your ETL to use bulk loading. Partition exchange stage table with your target fact table no change in ETL
18 Load Performance on HCC table ETL using Bulk Loading on HCC tables Timings include loading Dimensions (uncompressed) and fact tables. Compression Type Timing in MM:SS without HCC Timing in MM:SS with HCC QUERY HIGH QUERY LOW ARCHIVE HIGH ARCHIVE LOW
19 Effect of Sorting on HCC It was suggested that loading data into HCC tables after Sorting would increase the compression ratio resulting in more space savings. Data in COMP_TEST table was loaded (bulk load) by sorting (order by clause) the data on each of the dimension columns. Different sort columns were used Order by FU_KEY,FI_KEY,IS_PROD_KEY,SA_PROD_KEY, SE_PROD_KEY, SUB_PROD_KEY, AT_KEY, BT_KEY Order by FU_KEY,FI_KEY,IS_PROD_KEY,SA_PROD_KEY, SE_PROD_KEY, SUB_PROD_KEY, AT_KEY Order by FU_KEY,FI_KEY,IS_PROD_KEY,SA_PROD_KEY, SE_PROD_KEY, SUB_PROD_KEY Order by FU_KEY,FI_KEY,IS_PROD_KEY,SA_PROD_KEY, SE_PROD_KEY Order by FU_KEY,FI_KEY,IS_PROD_KEY,SA_PROD_KEY Order by FU_KEY,FI_KEY,IS_PROD_KEY Order by FU_KEY,FI_KEY
20 Effect of Sorting on HCC There was no significant change in compression ratio by using sorting and loading. There was no significant change in query performance by using sorting and loading. There was an increase in ETL load times because of sort and load operation.
21 Conclusion Based on the analysis done option COMPRESS FOR QUERY HIGH works best for us as it gives a good compression ratio with a better query/load times compared to table without compression. For archived tables with more than billion records we choose COMPRESS FOR QUERY HIGH because the compression ratio difference was not that significant and also the time it took to use COMPRESS FOR ARCHIVE HIGH was almost 10 times higher than COMPRESS FOR QUERY HIGH
22 Questions
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