Updating inside an oracle


One vexing issue with Oracle indexes is that the information for an index rebuild must be gathered from two sources: # rep dist.However, excessive activity within a table can cause Oracle indexes to dynamically reconfigure themselves.This reconfiguration involves three activities: Indexes require rebuilding when deleted leaf nodes appear or when the index has spawned into too many levels of depth."The DBAs were pulling out their hair until they noticed that the size of the indexes were too large for the amount of data in the tables, and remembered this old: myth?, and decided to try rebuilding the indexes on these tables.999999.99′) per_del, round(((sum(t.updates) sum(t.inserts) sum(t.deletes))/(decode(a.num_rows,0,1,a.num_rows)) *100.0),2) per_chg from analyzedb.table_modifications t, all_tables a where t.timestamp = to_date('&from_date','dd-mon-yyyy') and t.table_owner = a.owner and t.table_owner not in ('SYS','SYSTEM') and t.table_name=a.table_name having (sum(t.deletes)/(decode(a.num_rows,0,1,a.num_rows)))*100.0 Today, a battle is raging between the: academics?who do not believe that indexes should be rebuilt without expensive studies, and the: pragmatists?It is clear that all 70 of the index metrics interact together in a predictable way.Some scientist should be able to take this data and reverse-engineer the internal rules for index rebuilding, if any actually exist.While it may be rare to rebuild an Oracle index for performance reasons, there are some databases that will get a measurable performance boost from rebuilding indexes.These workloads have these characteristics: The rules for identification of candidates for index coalescing/rebuilding depend on your specific index state.

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