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CHAPTER 13 PARTITIONING
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Partitioning Overview
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Partitioning facilitates the management of very large tables and indexes using divide and conquer logic. Partitioning introduces the concept of a partition key that is used to segregate data based on a certain range value, a list of specific values, or the value of a hash function. If I were to put the benefits of partitioning in some sort of order, it would be 1. Increases availability of data: This attribute is applicable to all system types, be they OLTP or warehouse systems by nature. 2. Eases administration of large segments by removing them from the database: Performing administrative operations on a 100GB table, such as a reorganization to remove migrated rows or to reclaim whitespace left in the table after a purge of old information, would be much more onerous than performing the same operation ten times on individual 10GB table partitions. Additionally, using partitions, we might be able to conduct a purge routine without leaving whitespace behind at all, removing the need for a reorganization entirely! 3. Improves the performance of certain queries: This is mainly beneficial in a large warehouse environment where we can use partitioning to eliminate large ranges of data from consideration, avoiding accessing this data at all. This will not be as applicable in a transactional system, since we are accessing small volumes of data in that system already. 4. May reduce contention on high-volume OLTP systems by spreading out modifications across many separate partitions: If you have a segment experiencing high contention, turning it into many segments could have the side effect of reducing that contention proportionally. Let s take a look at each of these potential benefits of using partitioning.
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Increased Availability
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Increased availability derives from the independence of each partition. The availability (or lack thereof) of a single partition in an object does not mean the object itself is unavailable. The optimizer is aware of the partitioning scheme that is in place and will remove unreferenced partitions from the query plan accordingly. If a single partition is unavailable in a large object, and your query can eliminate this partition from consideration, then Oracle will successfully process the query. To demonstrate this increased availability, we ll set up a hash partitioned table with two partitions, each in a separate tablespace. We ll create an EMP table that specifies a partition key on the EMPNO column; EMPNO will be our partition key. In this case, this structure means that for each row inserted into this table, the value of the EMPNO column is hashed to determine the partition (and hence the tablespace) into which the row will be placed: ops$tkyte@ORA10G> CREATE TABLE emp 2 ( empno int, 3 ename varchar2(20) 4 ) 5 PARTITION BY HASH (empno)
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CHAPTER 13 PARTITIONING
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6 ( partition part_1 tablespace p1, 7 partition part_2 tablespace p2 8 ) 9 / Table created. Next, we insert some data into the EMP table and then, using the partition-extended table name, inspect the contents of each partition: ops$tkyte@ORA10G> insert into emp select empno, ename from scott.emp 2 / 14 rows created. ops$tkyte@ORA10G> select * from emp partition(part_1); EMPNO ENAME ---------- -------------------7369 SMITH 7499 ALLEN 7654 MARTIN 7698 BLAKE 7782 CLARK 7839 KING 7876 ADAMS 7934 MILLER 8 rows selected. ops$tkyte@ORA10G> select * from emp partition(part_2); EMPNO ENAME ---------- -------------------7521 WARD 7566 JONES 7788 SCOTT 7844 TURNER 7900 JAMES 7902 FORD 6 rows selected. You should note that the data is somewhat randomly assigned. That is by design here. Using hash partitioning, we are asking Oracle to randomly but hopefully evenly distribute our data across many partitions. We cannot control the partition into which data goes; Oracle decides that based on the hash key values that it generates. Later, when we look at range and list partitioning, we ll see how we can control what partitions receive which data. Now, we take one of the tablespaces offline (simulating, for example, a disk failure), thus making the data unavailable in that partition: ops$tkyte@ORA10G> alter tablespace p1 offline; Tablespace altered.
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