Partitioning
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Hi all, I am sharing small presentation about Partitioning. Hope it will be useful for you all.. :)
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Partitioning
- 2. www.company.com What is partitioning? When to partition a table? Partitioning stratergies Partitioning operations Advantages of partitioning Disadvantages of partitioning What We'll Cover ...
- 3. www.company.com What Is Partitioning ?? Partitioning allows tables, indexes to be subdivided into smaller pieces. Each piece of database object is called PARTITIONS. Tables are partitioned using a 'PARTITION KEY', a set of column/columns which determine in which partition a given row will reside. Company LOGO
- 4. www.company.com What Is Partitioning ?? Company LOGO
- 5. www.company.com When to Partition a table??? “Slow” queries ?? Tables containing historical data, in which new data is added into newest partition. When the contents of a table need to be distributed across different types of storage devices. Company LOGO
- 6. www.company.com Partitioning Strategies Company LOGO 1. Range partitioning 2. Interval partitioning 3. List partitioning 4. Hash partitioning 5. Composite partitioning
- 7. www.company.com 1. Range Partitioning It maps data into partition based on ranges of partition key values. Partitioning done based on consecutive range of values. Ex : Partition sales data into monthly partitions. Company LOGO
- 8. www.company.com 1. Range Partitioning Company LOGO January to August data
- 9. www.company.com Range Partitioning Example sal_3 sal_more sal_4 sal_3 sal_2 sal_more sal_1 sal_1 Inserting A Records Into Range Partitioned Table :
- 10. www.company.com 2. Interval Partitioning Extension of range partitioning. Automatically create new partition when data inserted into a table exceeds transition point. TRANSITION POINT – highest range partition. You must specify atleast one range partition. Company LOGO
- 11. www.company.com Interval Partitioning Example Inserting A Records Into Interval Partitioned Table : sal_3 SYS_P14160 SYS_P14159 30000 40000 55000 High_value
- 13. www.company.com 3. List Partitioning Company LOGO Company LOGO Partitioning done based on list of discrete values for the partition key . Enables to group and organize unordered and unrelated sets of data. Ex : States into a Region
- 15. www.company.com List Partitioning Example Company LOGO p1 p2 p3 p4 p3 p5 Inserting A Records Into List Partitioned Table :
- 16. www.company.com 4. Hash Partitioning Company LOGO Hash partitioning stores data to partitions based on a hashing algorithm that oracle applies to the partitioning key. Distribution is handled by oracle. Ex : order table → partitioned by cust_id Company LOGO
- 20. www.company.com View All Partitions Of Table Company LOGO
- 21. www.company.com SELECTING RECORDS Company LOGO Syntax : select * from TABLE_NAME partition (PARTITION_NAME);
- 22. www.company.com Adding a Partition Company LOGO 1. ADDING PARTITIONS : Syntax : ALTER TABLE table_name ADD PARTITION partition_name VALUES LESS THAN (VALUE); Partitioning Operations
- 23. www.company.com Adding a Partition Company LOGO 1. ADDING PARTITIONS : Range : We can't add partition when maxvalue specified in range partition. We can't add partition for the lower ranges. List : We can't add partition when default specified in list partition method. Interval : We can't add partitions. Partitioning Operations
- 24. www.company.com Dropping a Partition Company LOGO 2. DROPING PARTITIONS : Syntax : ALTER TABLE table_name DROP PARTITION partition_name ; Hash : We can't drop partitions created by hash method. Partitioning Operations
- 25. www.company.com Renaming a Partition Company LOGO 3. RENAMING PARTITIONS : Syntax : ALTER TABLE table_name RENAME PARTITION old_partition_name TO new_partition_name; Partitioning Operations
- 26. www.company.com Splitting a Partition Company LOGO 4. SPLITTING PARTITIONS : Syntax : ALTER TABLE table_name SPLIT PARTITION partition_name AT (value) INTO ( PARTITION partition_name1 , PARTITION partition_name2); Partitioning Operations
- 27. www.company.com Splitting a Partition Company LOGO 4. SPLITTING PARTITIONS : Hash : We can't split partitions. Partitioning Operations
- 28. www.company.com Merging a Partition Company LOGO 5. MERGING PARTITIONS : Syntax : ALTER TABLE table_name MERGE PARTITION partition_name1,partition_name2 INTO PARTITION partition_name3; Partitioning Operations
- 29. www.company.com Merging a Partition Company LOGO 5. MERGING PARTITIONS : Hash : We can't merge partitions. Partitioning Operations
- 31. www.company.com Disadvantage Of Partitioning You need to buy licenses before you can use it. It take up a space. additional administration tasks to manage partitions. Company LOGO