This has some costs in terms of resource consumption, because obviously maintaining a large amount of index entries will consume CPU and redo, but it kept the index available to application users. But notice that the local index has not been spared from being marked unusable.
We had to rebuild each local partition after the operation. There is no such thing as keeping only the local indexes entries updated and not the global ones. The queries will just be optimized as if the indexes did not exist, which might have an impact on their execution time. Here is a a simple starting point for a monitoring query to keep an eye on unusable indexes and rebuild them if necessary :. And finally, as Tim reminded me, with 12c Release 2, many partition operations and many other maintenance operations as well can now be done online simply by specifying ONLINE as a suffix to the operation.
Yes we can. Can it be done in parallel like rebuild to speed up? Updating indexes will slow things down because it not too much different from a large delete and insert. You are commenting using your WordPress. Maintaining the index in your case takes longer then a disable, load, and rebuild. If that is acceptable -- that is the option you want. If you primary goal is continous operation -- the penalty is "longer load time" in your case but not in EVERYONES case in your case, the real difference is 5 mins versus 3 mins -- forget that 25 minute one you already figured that out on your own.
Rating 5 ratings Is this answer out of date? Nemec, December 21, - pm UTC. You can also catch regular content via Connor's blog and Chris's blog. Or if video is more your thing, check out Connor's latest video and Chris's latest video from their Youtube channels. And of course, keep up to date with AskTOM via the official twitter account. Questions difference between dropping rebuilding indexes and using update global indexes. Again, you must compare the time it takes to do the DDL and then rebuild all indexes.
The index is updated in place. The updates to the index are logged, and redo and undo records are generated. Rebuilding the entire index manually creates a more efficient index, because it is more compact with better space utilization. For the remaining operations in the above list, global indexes on index-organized tables remain usable. This clause has been deprecated. Oracle Database now automatically collects statistics during index creation and rebuild.
This clause is supported for backward compatibility and will not cause errors. This clause specifies the parameter string that is passed uninterpreted to the appropriate ODCI indextype routine.
The maximum length of the parameter string is characters. If you are altering or rebuilding an entire index, then the string must refer to index-level parameters. If you are rebuilding a partition of the index, then the string must refer to partition-level parameters.
If you have installed Oracle Text, then you can rebuild your Oracle Text domain indexes using parameters specific to that product. For more information on those parameters, please refer to Oracle Text Reference.
Oracle Data Cartridge Developer's Guide for more information on indextype routines. ENABLE applies only to a function-based index that has been disabled because a user-defined function used by the index was dropped or replaced. This clause enables such an index if these conditions are true:.
The signature of the current function matches the signature of the function when the index was created. This clause lets you disable the use of a function-based index.
You might want to do so, for example, while working on the body of the function. An unusable index must be rebuilt, or dropped and re-created, before it can be used.
You can execute statements that require the index if the statements do not access the unusable partition. You can also split or rename the unusable partition before rebuilding it.
Restriction on Marking Indexes Unusable You cannot specify this clause for an index on a temporary table. Use this clause to rename an index. Restrictions on Coalescing Index Blocks Coalescing of index blocks is subject to the following restrictions:.
Do not specify this clause for the primary key index of an index-organized table. Oracle Database Administrator's Guide for more information on space management and coalescing indexes. Specify this clause to update all the stale guess data block addresses stored as part of the index row with the correct database address for the corresponding block identified by the primary key.
This routine enables the cartridge code to update the stale guess data block addresses in the index.
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