Various Table Partitioning in SAP HANA

Nov 1, 20144 likes6,991 views

The document discusses various table partitioning methods in SAP HANA including round-robin, hash, and range partitioning. It provides examples of partitioning tables using each method and redistributing the partitions across multiple hosts. It also describes how to change a partitioned table back to a non-partitioned table if the partitioning is not distributing records properly.

Various Table Partitioning in SAP HANA Prepared by Debajit Banerjee
For simplicity, here I have discussed only Single-Level Partitioning with all the three partitioning specifications - Hash,
Range and Round-robin. Also I have shown the steps for re-distribution of all the partitions to different hosts in a
distributed SAP HANA database.
Partitioning a Non-Partitioned Table ………………………………………………………………………………………… 2
Round-Robin Partitioning ……………………………………………………………………………………………………………. 2
Hash Partitioning ……………………………………………………………………………………………….. 8
Range Partitioning ……………………………………………………………………………………………… 14
Changing a Partitioned Table into a Non-Partitioned Table …………………………. 18
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Various Table Partitioning in SAP HANA Prepared by Debajit Banerjee
Partitioning a Non-Partitioned Table
Round-Robin Partitioning – Table
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Various Table Partitioning in SAP HANA Prepared by Debajit Banerjee
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Various Table Partitioning in SAP HANA Prepared by Debajit Banerjee
Before doing a redistribution operation, it is always better to save the current configuration.
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Various Table Partitioning in SAP HANA Prepared by Debajit Banerjee
Now, Round-robin Partitioning has been completed and Partitioned Tables also distributed between two hosts.
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Various Table Partitioning in SAP HANA Prepared by Debajit Banerjee
HASH Partitioning - Table
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Various Table Partitioning in SAP HANA Prepared by Debajit Banerjee
Now, Hash Partitioning of AUSP table has been completed and Partitioned Tables also distributed between 4 hosts.
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Various Table Partitioning in SAP HANA Prepared by Debajit Banerjee
Range Partitioning - Table
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Various Table Partitioning in SAP HANA Prepared by Debajit Banerjee
Now, Range Partitioning of KONV table has been completed.
From the results, we can easily understand that distribution of records was not proper between all the partitions.
What to do then?
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Various Table Partitioning in SAP HANA Prepared by Debajit Banerjee
Changing a Partitioned Table into a Non-Partitioned Table
As per the above Range partition results, it clearly depicts that distribution was not proper as Range selections were
wrong.
So, to rectify the same we have to follow the below process –
1) Changing Partitioned Table into a Non-Partitioned Table
2) Then Repartition the table with proper range selection
Select the Merge Partitions option.
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Various Table Partitioning in SAP HANA Prepared by Debajit Banerjee
Once again, trying to do Range Partition now for better record distributions.
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Various Table Partitioning in SAP HANA Prepared by Debajit Banerjee
===== End of Document ======
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How to free up memory in HANA? Is it possible to unload Table from memory? - Yes, it is possible. SAP HANA Appliance can be used in smarter way to achieve maximum out of it. In a typical business scenario, one SAP HANA appliance is used for DEV, TRN, TST environments. So, definitely there will be a major issue in this case – How to handle memory as memory is limited in that particular HANA appliance? Under normal circumstances, the SAP HANA database manages the loading and unloading of tables into and from memory independently. Actually, the main aim of SAP HANA database is to keep all relevant data in memory. But, one can manually load and unload individual tables if necessary. How?....It’s simple, and it can be done from SAP HANA Studio itself. Select the table by right click and choose the option “Unload …” And later, manually load the table into memory again, if needed. Moreover, if somebody fires the query associated to the same unloaded table, SAP HANA will pick & load the same table into memory FULL or PARTIALLY, purely depending upon the executed query. Again, if one needs to free up memory, he/she can manually trigger the delta merge operation for a column table manually in SAP HANA Studio. The delta merge operation is related to the memory management concept of the column store, i.e, the part of the SAP HANA Database that manages data organized in columns in memory. So, options are as follows: “Unload …” – Free up memory by unloading table from memory “Load …” – Loading the table into memory “Merge…” – Triggering delta merge operation for a column table

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HBase Global Indexing to support large-scale data ingestion at UberDataWorks Summit

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Various Table Partitioning in SAP HANA

1. Various Table Partitioning in SAP HANA Prepared by Debajit Banerjee For simplicity, here I have discussed only Single-Level Partitioning with all the three partitioning specifications - Hash, Range and Round-robin. Also I have shown the steps for re-distribution of all the partitions to different hosts in a distributed SAP HANA database. Partitioning a Non-Partitioned Table ………………………………………………………………………………………… 2 Round-Robin Partitioning ……………………………………………………………………………………………………………. 2 Hash Partitioning ……………………………………………………………………………………………….. 8 Range Partitioning ……………………………………………………………………………………………… 14 Changing a Partitioned Table into a Non-Partitioned Table …………………………. 18 http://debajitb.wix.com/debajitbanerjee | http://debajitb.wix.com/debajitbanerjee/apps/blog 1

2. Various Table Partitioning in SAP HANA Prepared by Debajit Banerjee Partitioning a Non-Partitioned Table Round-Robin Partitioning – Table http://debajitb.wix.com/debajitbanerjee | http://debajitb.wix.com/debajitbanerjee/apps/blog 2

3. Various Table Partitioning in SAP HANA Prepared by Debajit Banerjee http://debajitb.wix.com/debajitbanerjee | http://debajitb.wix.com/debajitbanerjee/apps/blog 3

4. Various Table Partitioning in SAP HANA Prepared by Debajit Banerjee Before doing a redistribution operation, it is always better to save the current configuration. http://debajitb.wix.com/debajitbanerjee | http://debajitb.wix.com/debajitbanerjee/apps/blog 4

5. Various Table Partitioning in SAP HANA Prepared by Debajit Banerjee http://debajitb.wix.com/debajitbanerjee | http://debajitb.wix.com/debajitbanerjee/apps/blog 5

6. Various Table Partitioning in SAP HANA Prepared by Debajit Banerjee http://debajitb.wix.com/debajitbanerjee | http://debajitb.wix.com/debajitbanerjee/apps/blog 6

7. Various Table Partitioning in SAP HANA Prepared by Debajit Banerjee Now, Round-robin Partitioning has been completed and Partitioned Tables also distributed between two hosts. http://debajitb.wix.com/debajitbanerjee | http://debajitb.wix.com/debajitbanerjee/apps/blog 7

8. Various Table Partitioning in SAP HANA Prepared by Debajit Banerjee HASH Partitioning - Table http://debajitb.wix.com/debajitbanerjee | http://debajitb.wix.com/debajitbanerjee/apps/blog 8

9. Various Table Partitioning in SAP HANA Prepared by Debajit Banerjee http://debajitb.wix.com/debajitbanerjee | http://debajitb.wix.com/debajitbanerjee/apps/blog 9

10. Various Table Partitioning in SAP HANA Prepared by Debajit Banerjee http://debajitb.wix.com/debajitbanerjee | http://debajitb.wix.com/debajitbanerjee/apps/blog 10

11. Various Table Partitioning in SAP HANA Prepared by Debajit Banerjee http://debajitb.wix.com/debajitbanerjee | http://debajitb.wix.com/debajitbanerjee/apps/blog 11

12. Various Table Partitioning in SAP HANA Prepared by Debajit Banerjee http://debajitb.wix.com/debajitbanerjee | http://debajitb.wix.com/debajitbanerjee/apps/blog 12

13. Various Table Partitioning in SAP HANA Prepared by Debajit Banerjee Now, Hash Partitioning of AUSP table has been completed and Partitioned Tables also distributed between 4 hosts. http://debajitb.wix.com/debajitbanerjee | http://debajitb.wix.com/debajitbanerjee/apps/blog 13

14. Various Table Partitioning in SAP HANA Prepared by Debajit Banerjee Range Partitioning - Table http://debajitb.wix.com/debajitbanerjee | http://debajitb.wix.com/debajitbanerjee/apps/blog 14

15. Various Table Partitioning in SAP HANA Prepared by Debajit Banerjee http://debajitb.wix.com/debajitbanerjee | http://debajitb.wix.com/debajitbanerjee/apps/blog 15

16. Various Table Partitioning in SAP HANA Prepared by Debajit Banerjee http://debajitb.wix.com/debajitbanerjee | http://debajitb.wix.com/debajitbanerjee/apps/blog 16

17. Various Table Partitioning in SAP HANA Prepared by Debajit Banerjee Now, Range Partitioning of KONV table has been completed. From the results, we can easily understand that distribution of records was not proper between all the partitions. What to do then? http://debajitb.wix.com/debajitbanerjee | http://debajitb.wix.com/debajitbanerjee/apps/blog 17

18. Various Table Partitioning in SAP HANA Prepared by Debajit Banerjee Changing a Partitioned Table into a Non-Partitioned Table As per the above Range partition results, it clearly depicts that distribution was not proper as Range selections were wrong. So, to rectify the same we have to follow the below process – 1) Changing Partitioned Table into a Non-Partitioned Table 2) Then Repartition the table with proper range selection Select the Merge Partitions option. http://debajitb.wix.com/debajitbanerjee | http://debajitb.wix.com/debajitbanerjee/apps/blog 18

19. Various Table Partitioning in SAP HANA Prepared by Debajit Banerjee Once again, trying to do Range Partition now for better record distributions. http://debajitb.wix.com/debajitbanerjee | http://debajitb.wix.com/debajitbanerjee/apps/blog 19

20. Various Table Partitioning in SAP HANA Prepared by Debajit Banerjee http://debajitb.wix.com/debajitbanerjee | http://debajitb.wix.com/debajitbanerjee/apps/blog 20

21. Various Table Partitioning in SAP HANA Prepared by Debajit Banerjee http://debajitb.wix.com/debajitbanerjee | http://debajitb.wix.com/debajitbanerjee/apps/blog 21

22. Various Table Partitioning in SAP HANA Prepared by Debajit Banerjee ===== End of Document ====== http://debajitb.wix.com/debajitbanerjee | http://debajitb.wix.com/debajitbanerjee/apps/blog 22

Various Table Partitioning in SAP HANA

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Various Table Partitioning in SAP HANA