After the index has been read, Oracle will replace the old index tree in the same spot in the tablespace as the old index. For even faster execution time, the unrecoverable clause can be used with the rebuild command. Listing 8.9 The output from rebuilding the indexes alter index DON.DON_EK rebuild tablespace INDX_1; index rebuilt Analyze the indexes and rebuild them Hello UNIX and Oracle Gurus, After doing an intensive search from different websites, the UNIX forum I am posting this message seeking help.. I am trying to accomplish the following tasks through the shell script: 1. How to reorganize and rebuild index: Using SQL Server Management Studio: In the Object Explorer pane navigate to and expand the SQL Server, and then the Databases node. Expand the specific database with fragmented index. Expand the Tables node, and the table with fragmented index. Expand the specific table. Only the following operations can make use of the NOLOGGING option: alter tablemove partition alter tablesplit partition alter indexsplit partition alter indexrebuild alter indexrebuild partition create tableas select create index direct load with SQL*Loader direct load INSERT Many Oracle professionals use NOLOGGING because the actions runs fast because the Oracle redo logs are bypassed. However, this can be quite dangerous if you need to roll-forward through this time Rebuild all indexes for a table in offline mode. ALTER INDEX ALL ON XXXMYTABLEXXX REBUILD Rebuild one specified index for a table in offline mode. ALTER INDEX XXXMYINDEXXXX ON XXXMYTABLEXXX REBUILD Solution 2. Fragmentation. Fragmentation is an issue in tables that regularly have entries both added and removed. Check fragmentation percentage
2 Jul 2010 of course, is that unrecoverable is a deprecated option so you shouldn't be using it even though it still works. If you rebuild an index unrecoverable, it is the operation that is SQL> alter index t3_i1 rebuild unrecoverable;. You must have tablespace quota to modify, rebuild, or split an index partition or to a different value for logging in the REBUILD clause, then Oracle Database uses the UNRECOVERABLE is not a valid keyword for creating partitioned or
Rebuild all indexes for a table in offline mode. ALTER INDEX ALL ON XXXMYTABLEXXX REBUILD Rebuild one specified index for a table in offline mode. ALTER INDEX XXXMYINDEXXXX ON XXXMYTABLEXXX REBUILD Solution 2. Fragmentation. Fragmentation is an issue in tables that regularly have entries both added and removed. Check fragmentation percentage You can use NOLOGGING and PARALLEL with the online rebuild: alter index my_idx rebuild online parallel 63 nologging; alter index my_idx noparallel; alter index my_idx logging; Alter index rebuild: During a "regular" index rebuild, an exclusive lock occurs as the existing index is read. Hence, this command is designed for scheduled downtime periods where there is no DML activity. When should I rebuild indexes? When the index fragmentation percentage is more than 30%. Is there a case for rebuilding indexes on a regular basis? There is no such case, but in general, doing Index Maintenance once in a week, over the weekend is the best practice to keep the environment stable.
alter index "index_name" rebuild [unrecoverable]; if you want the index to be rebuilt faster use "unrecoverable", in this way the log will not be used, but the index is unrecoverable. rebuild is a "bulk operation". it is true that SOMETIMES, disabling an index, doing a large bulk load, re-enabling and rebuild the index is FASTER than "leaving the index in place during the load". This is true for single partition tables (normal tables) as well as partitioned tables. How to reorganize and rebuild index: Using SQL Server Management Studio: In the Object Explorer pane navigate to and expand the SQL Server, and then the Databases node. Expand the specific database with fragmented index. Expand the Tables node, and the table with fragmented index. Expand the specific table.
faq: How to reorganize or rebuild a fragmented BeyondTrust Privileged Identity index in SQL Server 2017 by using SQL Server Management Studio or Show 7 replies. 1. Re: Rebuild using unrecoverable clause fjfranken Jul 19, 2010 8:49 AM (in response to user8916506) Index rebuild in 24/ production database is only OK when using the "online" clause, otherwise it will lock the index and table for the period of the rebuild. Right-click the index you want to reorganize and select Rebuild. In the Rebuild Indexes dialog box, verify that the correct index is in the Indexes to be rebuilt grid and click OK. Select the Compact large object column data check box to specify that all pages that contain large object (LOB) data are also compacted. You cannot rebuild a local index, but you can rebuild a partition of a local index (ALTER INDEX REBUILD PARTITION). For a local index on a hash partition or subpartition, the only parameter you can specify is TABLESPACE. PARTITION Clause. Use the PARTITION clause to rebuild one partition of an index. You can also use this clause to move an index partition to another tablespace or to change a create-time physical attribute. If you rebuild an index unrecoverable, it is the operation that is unrecoverable – the index state after the rebuild is still logging ; if you rebuild the index nologging, both the operation and the state of the index are nologging – you’ve used one word to mean two different things – future rebuilds of the index will be implicitly nologging unless you deliberate modify the index to logging, or explicitly state that the rebuild should be logging. Click on table that has the indexes you need to rebuild Choose Tables folder and expand it After that, click on desired index you need to reorganize and open it Now, right-click on index and select reorganize option alter index "index_name" rebuild [unrecoverable]; if you want the index to be rebuilt faster use "unrecoverable", in this way the log will not be used, but the index is unrecoverable.