Table 42 alter table maintenance operations for table subpartitions. Rebuild local indexes using either alter index or alter table as follows alter index rebuild partition subpartition. About renaming partitions and subpartitions oracle. I, for example, need to do this because i will create the new subpartition to hold my new data. I wont be commenting on whether index needed to be rebuilded or not. The index must be in your own schema or you must have alter any index system privilege. I use exchange partition on the child tables first, then i. Then, after the bulk load operation, you can issue the following command to rebuild the indexes for the. So to move them to another tablespace, you need to rebuild the subpartitions. Partial indexes for partitioned tables in oracle database 12c release 1. For compositepartitioned tables, use alter index rebuild subpartition to rebuild a subpartition of an index. For an online rebuild operation alter index rebuild online, performs cleanup operations on tables associated with the older version of the index.
You must have tablespace quota to modify, rebuild, or split an index partition or to modify or rebuild an index subpartition. There are 3 tables involved, a parent apntmt that is range partitioned monthly, and two child tables that are reference partitioned. Use the alter index statement to change or rebuild an existing index. Oracle assigns names and default physical storage attributes to the new index partitions. When you recreate the index, you can also choose to move the partition to a new tablespace or change attributes. This statement rebuilds an index partition or subpartition unconditionally. Rebuilding an index just because it might be the cause of some issue is a fairly nonprofessional thing to do. I already know about the alter table tablename modify partition partitionname add subpartition subpartionname values value command. If you omit schema, then oracle database assumes the index is in your own schema. This entry was posted in oracle, sql commands and tagged alter, index, move, oracle, partition, sql, tablespace on march 28, 20 by duarte velez grilo.
You can move the subpartition to another tablespace or specify a parallel clause. You can rebuild a subpartition to regenerate the data in an index subpartition. Rebuilding table with lob type index oracle community. Yes, there are times when an index rebuild can be harmful.
Rebuilding a partitioned index rebuilding a partitioned index is slightly different then rebuilding a normal nonpartitioned index. I previously discussed how index advanced compression can automatically determine not only the correct number of columns to compress, but. You must have tablespace quota to modify, rebuild, or split an index partition. Multicolumn index part ii blow out september 24, 2015 posted by richard foote in advanced index compression, concatenated indexes, index column order, index rebuild, oracle indexes. Note that in this example, the index is rebuilt in a different tablespace. How to make index unusable and then rebuilt in index. Hi all, i have to rebuild a table with lob type index. To execute the monitoring usage clause, the index must be in your own schema. Oracle 8i oracle 9i oracle 10g oracle 11g oracle 12c oracle c oracle 18c oracle 19c miscellaneous plsql sql oracle rac oracle apps weblogic linux mysql. Tablespace syntax is to be used when you want to move an index to another tablespace. The index must be in your own schema or you must have alter any index.
Rebuilds a spatial index or a specified partition of a partitioned index. I have to rebuild several very large indexes and i need to know the fastest way to rebuild the index what are the performance options for a fast index rebuild. Developers and dbas get help from oracle experts on. Online split partition and split subpartition in oracle database 12c release 2 12. Check status column after you rebuild all subpartition index like show 0 likes 0. Oracle index or partition is in unusable state oracle. No, there are no times when a scheduled rebuild of all indexes is good. Hi, i got from websites that below details today i found myself in a situation where i needed to compress an already existing, partitioned index. Rebuild the index a partition at a time using alter index rebuild partition or drop and recreate the entire index. How to move a partitionated index to another tablespace. This is done by the addition of the online keyword, which also causes local and global indexes to be updated. The globally partitioned index diagram however, shows that the index entries in a global index may point into any or all of the table partitions.
Ask tom using rebuild parallel option on large table index. Hi, did you meant you want the syntax to rebuild the index. The following sections discuss options for rebuilding index partitions and subpartitions. Home database oracle database online documentation 11g release 1. Split will split a partition into multiple partitions, not introduce subpartitions. When an object is renamed in oracle, it would not take time. Only for very small amounts of time is a lock acquired on the target table. The entry titled index create and rebuild locking improvements in 11g ch ch ch changes contains a description of how the online index rebuild can create locks that block other sessions. Online is not a recognized alter index rebuild partition option. Using rebuild parallel option on large table index with 6 cpus. You cannot say i like to define an index on a partition or subpartition wernfried domscheit jan 18 17 at. Per bug 3661285, the oracle 11g segment advisor now detects sparse indexes and automatically flags them for rebuilding. If the partition or subpartition to be truncated contains data, then you must first disable any referential integrity constraints on the table.
Browse other questions tagged oracle index oracle 11g r2 partitioning or ask your own question. Your answer thanks for contributing an answer to stack overflow. Specifies in a command string the index parameters. Which was succesful but my application is still complaining about an index ora01502, so i wanted to make sure my query to idenify the indexes and partitions was correct. Use the alter index rename partition statement to rename an index partition. With the online index rebuild, update transactions will still be able to access the table and index. Most oracle administrators run this script, and then select the index that they would like to rebuild. The alter index rebuild partition statement rebuilds one partition of an index. At its most basic, it is fairly simple to mark an index unusable and then rebuild an index. In sql server 2014, online single partition index operations are supported.
Alternatively, the following performs the same, but avoids writing to the redo logs and thus speeds up the index rebuild. Similarly, when i exchange partitions with nonpartitioned table, will it result fast as is in renaming of objects. Also, note that the number of index partitions may in fact be different than the number of table partitions. The alter index statement does not support the use of for value to. Readonly partitions and subpartitions in oracle database 12c release 2 12. Specifies in a command string the index parameters to use in rebuilding the spatial index. A blog about oracle administration and configuration. The name of the feature single partition online index rebuild is mouthful, so some of you may prefer to use spoir in your day to day talk. Rebuild subpartition to rebuild a subpartition of an index.
Since oracle assigns names and default physical storage attributes to the new index partitions, you may wish to rename or alter them after the add. In oracle 11g, is there a way to introduce subpartitions into an existing partitioned table. I cant afford to rebuild a global index on a 3 tb table every month. I cannot seem to find a combination of exchange and split partition that does the right thing. You cannot generalize to say that index rebuilding for performance is rare, or even medium rare, it depends on many factors, most importantly the characteristics of the application. In 11g and beyond, oracle will wait for any long running dml transactions to complete before starting the online index rebuild, but it will not block any new dml. To rebuild index partitions that have been marked unusable. Online split partition and split subpartition in oracle.
Use the alter table add partition statement to add a new partition to the high. How to maintain a global index on a large table undergoing regular partition purges. For a compositepartitioned index, you can specify tablespace storage for each subpartition. Yes, there are times when an index rebuild can be beneficial.
I think when you rebuild subpartition index no need to rebuild partition index. Oracle 12c allows the creation of global and local indexes on a. Readonly partitions and subpartitions in oracle database. To modify a domain index, you must have execute object privilege on the indextype of the index. Underlying mechanism of exchanging the partitions oracle. Maintenance operations for partitioned tables and indexes. Table 43 alter index maintenance operations for index partitions. Hi, as per my original post i identified the index and then rebuilt it. Using alter index to rebuild a partition oracle docs. Rebuild an index while it is being referenced in oracle. Partial indexes for partitioned tables in oracle database. However, i would like to understand the underlying mechanism of exchanging the partitions. When oracle rebuilds an index, you have several tuning options to make it faster.
Anyone interested in an answer to my original question may learn something by following that link. For a local index on a hash partition or subpartition, the only parameter you can specify is tablespace. Oracle database marks each index subpartition in the partition unusable and you must. This statement finds all of the unusable indexes for the given table partition or subpartition and rebuilds them. The following statement rebuilds a subpartition of a local index on a table. Note that the tablespace clause should always be used with the alter index rebuild command to ensure that the index is not rebuilt within the default tablespace usually sys. Or oracle has to rebuild all the segments and will take time. If you are rebuilding the index partition in the same tablespace, then you do not need the second alter index statement. Index partitions and subpartitions can be renamed in similar fashion, but the alter index syntax is used. Browse other questions tagged index oracle 11g r2 or ask your own question. You must then rebuild the entire index or, for a global index, each of its partitions.