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CHAPTER 13 PARTITIONING
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Looking at our indexes, however, we ll find the following: ops$tkyte@ORA11GR2> select index_name, status from user_indexes; INDEX_NAME -----------------------------FY_2006_IDX FY_2004_IDX PARTITIONED_IDX_GLOBAL PARTITIONED_IDX_LOCAL STATUS -------VALID VALID UNUSABLE N/A
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The global index is, of course, unusable after this operation. Since each index partition can point to any table partition, and we just took away a partition and added a partition, that index is invalid. It has entries that point into the partition we dropped. It has no entries that point into the partition we just added. Any query that would make use of this index would fail and not execute, or, if we skip unusable indexes the query s performance would be negatively impacted by not being able to use the index: ops$tkyte%ORA11GR2> select /*+ index( partitioned PARTITIONED_IDX_GLOBAL ) */ 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' ); select /*+ index( partitioned PARTITIONED_IDX_GLOBAL ) */ count(*) * ERROR at line 1: ORA-01502: index 'OPS$TKYTE.PARTITIONED_IDX_GLOBAL' or partition of such index is in unusable state ops$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: 463372681 --------------------------------------------------------------------------------| Id | Operation | Name | Rows | Cost (%CPU)|Pstart|Pstop| --------------------------------------------------------------------------------| 0 | SELECT STATEMENT | | 1 | 69 (2)| | | | 1 | SORT AGGREGATE | | 1 | | | | | 2 | PARTITION RANGE SINGLE| | 4698 | 69 (2)| 2 | 2| |* 3 | TABLE ACCESS FULL | PARTITIONED | 4698 | 69 (2)| 2 | 2| --------------------------------------------------------------------------------Predicate Information (identified by operation id): --------------------------------------------------3 - filter("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'))
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CHAPTER 13 PARTITIONING
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So, our choices after performing this partition operation with global indexes are Skip the index, either transparently as Oracle is doing in this example or by setting the session parameter SKIP_UNUSABLE_INDEXES=TRUE in 9i (Oracle 10g defaults this setting to TRUE). But then we lose the performance the index was giving us. Have queries receive an error, as they would without SKIP_UNUSABLE_INDEXES set to FALSE in 9i and before or queries that explicitly request to use a hint will in 10g. We need to rebuild this index to make the data truly usable again.
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The sliding window process, which so far has resulted in virtually no downtime, will now take a very long time to complete while we rebuild the global index. Runtime query performance of queries that relied on these indexes will be negatively affected during this time either they will not run at all or they will run without the benefit of the index. All of the data must be scanned and the entire index reconstructed from the table data. If the table is many hundreds of gigabytes in size, this will take considerable resources.
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Starting in Oracle9i, another option was added to partition maintenance: the ability to maintain the global indexes during the partition operation using the UPDATE GLOBAL INDEXES clause. This means that as you drop a partition, split a partition, perform whatever operation necessary on a partition, Oracle will perform the necessary modifications to the global index to keep it up to date. Since most partition operations will cause this global index invalidation to occur, this feature can be a boon to systems that need to provide continual access to the data. You ll find that you sacrifice the raw speed of the partition operation, but with the associated window of unavailability immediately afterward as you rebuild indexes, for a slower overall response time from the partition operation but coupled with 100 percent data availability. In short, if you have a data warehouse that cannot have downtime, but must support these common data warehouse techniques of sliding data in and out, then this feature is for you but you must understand the implications. Revisiting our previous example, if our partition operations had used the UPDATE GLOBAL INDEXES clause when relevant (in this example, it would not be needed on the ADD PARTITION statement since the newly added partition would not have any rows in it) ops$tkyte@ORA11GR2> alter table partitioned 2 exchange partition fy_2004 3 with table fy_2004 4 including indexes 5 without validation 6 UPDATE GLOBAL INDEXES 7 / Table altered. ops$tkyte@ORA11GR2> alter table partitioned 2 drop partition fy_2004 3 UPDATE GLOBAL INDEXES 4 / Table altered. ops$tkyte@ORA11GR2> alter table partitioned 2 add partition fy_2006 3 values less than ( to_date('01-jan-2007','dd-mon-yyyy') ) 4 / Table altered.
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