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CHAPTER 13 PARTITIONING
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ops$tkyte@ORA11GR2> alter table partitioned 2 exchange partition fy_2006 3 with table fy_2006 4 including indexes 5 without validation 6 UPDATE GLOBAL INDEXES 7 / Table altered. we would have discovered the indexes to be perfectly valid and usable both during and after the operation. Note in the following output, the N/A status observed for the PARTITIONED_IDX_LOCAL index simply means the statuses are associated with the index partitions associated with that index not the index itself. It doesn t make sense to say the locally partitioned index is value or not; it is just a container that logically holds the index partitions themselves: ops$tkyte@ORA11GR2> select index_name, status from user_indexes; INDEX_NAME -----------------------------FY_2006_IDX FY_2004_IDX PARTITIONED_IDX_GLOBAL PARTITIONED_IDX_LOCAL 6 rows selected. ops$tkyte%ORA11GR2> select count(*) 2 from partitioned 3 where timestamp between to_date( '01-mar-2006', 'dd-mon-yyyy' ) 4 and to_date( '31-mar-2006', 'dd-mon-yyyy' ); COUNT(*) ---------6200 Execution Plan ---------------------------------------------------------Plan hash value: 1633852947 --------------------------------------------------------------------------------| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| --------------------------------------------------------------------------------| 0 | SELECT STATEMENT | | 1 | 9 | 24 (0)| | 1 | SORT AGGREGATE | | 1 | 9 | | |* 2 | INDEX RANGE SCAN| PARTITIONED_IDX_GLOBAL | 2500 | 22500 | 24 (0)| --------------------------------------------------------------------------------Predicate Information (identified by operation id): --------------------------------------------------2 - access("TIMESTAMP">=TO_DATE(' 2006-03-01 00:00:00', 'syyyy-mm-dd hh24:mi:ss') AND "TIMESTAMP"<=TO_DATE(' 2006-03-31 00:00:00', 'syyyy-mm-dd hh24:mi:ss')) STATUS -------VALID VALID VALID N/A
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CHAPTER 13 PARTITIONING
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But there is a tradeoff: we are performing the logical equivalent of DELETE and INSERT operations on the global index structures. When we drop a partition, we have to delete all of the global index entries that might be pointing to that partition. When we did the exchange of a table with a partition, we had to delete all of the global index entries pointing to the original data and then insert all of the new ones that we just slid in there. So the amount of work performed by the ALTER commands was significantly increased. You should expect with global index maintenance considerations that the approach without index maintenance will consume fewer database resources and therefore perform faster but incur a measurable period of downtime. The second approach, involving maintaining the indexes, will consume more resources and perhaps take longer overall, but will not incur downtime. As far as the end users are concerned, their ability to work never ceased. They might have been processing a bit slower (since we were competing with them for resources), but they were still processing, and they never stopped. The index rebuild approach will almost certainly run faster, considering both the elapsed time and the CPU time. This fact has caused many a DBA to pause and say, Hey, I don t want to use UPDATE GLOBAL INDEXES it s slower. That is too simplistic of a view, however. What you need to remember is that while the operations overall took longer, processing on your system was not necessarily interrupted. Sure, you as the DBA might be looking at your screen for a longer period of time, but the really important work that takes place on your system was still taking place. You need to see if this tradeoff makes sense for you. If you have an eight-hour maintenance window overnight in which to load new data, then by all means, use the rebuild approach if that makes sense. However, if you have a mandate to be available continuously, then the ability to maintain the global indexes will be crucial. One more thing to consider is the redo generated by each approach. You will find that the UPDATE GLOBAL INDEXES generates considerably more redo (due to the index maintenance) and you should expect that to only go up as you add more and more global indexes to the table. The redo generated by the UPDATE GLOBAL INDEXES processing is unavoidable and cannot be turned off via NOLOGGING, since the maintenance of the global indexes is not a complete rebuild of their structure but more of an incremental maintenance. Additionally, since you are maintaining the live index structure, you must generate undo for that in the event the partition operation fails, you must be prepared to put the index back the way it was. And remember, undo is protected by redo itself, so some of the redo you see generated is from the index updates and some is from the rollback. Add another global index or two and you would reasonably expect these numbers to increase. So, UPDATE GLOBAL INDEXES is an option that allows you to trade off availability for resource consumption. If you need to provide continuous availability, it s the option for you. But you have to understand the ramifications and size other components of your system appropriately. Specifically, many data warehouses have been crafted over time to use bulk direct path operations, bypassing undo generation and, when permitted, redo generation as well. Using UPDATE GLOBAL INDEXES cannot bypass either of those two elements. You need to examine the rules you use to size your redo and undo needs before using this feature, so you can assure yourself it can work on your system.
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