Oracle trigger updating predicate multiple columns

i use oracle logminer to analysis oracle redo log,and my program relied heavily on scn increase strictly,but sometimes i found that scn from result of logminer is not increase。for example:2694206926942070269420712694205826942071269420712694207126942071As we al...Hi Tom I'm trying to determine if its best to write this logic in SQL or should I write a PLSQL block.i need to generate my output as Date----12/01/200312/02/200312/03/200...a sql code to remove all the special characters from a particular column of a table example :i NPUT-ABC -D. FOUTPUT ABC DEFAND IF THERE IS TWO NAMES LIKE ABC PRIVATE LTDONE SPACE SHOULD BE MAINTAINED BETWEEN 2 WORDS.... Hi Tom, I'm sorry, I am working on so much topics, that I don't have time to search.Which variant is better in terms of downtime of the table, space consumption, and whether the process is restartable? The table is a heap table of about 3.5GB with one primary key.There are only two approaches I would even consider: First, if I can have downtime, the easiest would be in archive log mode).Another way would be to use the UPDATING function like this: create or replace trigger my_trigger before update on my_table for each row declare n_cols integer := 0; begin for r in (select column_name from all_tab_columns where table_name = 'MY_TABLE' and owner = 'MY_SCHEMA') loop if updating(r.column_name) then n_cols := n_cols 1; exit when n_cols It's probably not the answer you want to hear, but I think you are rather over-exaggerating the burden of maintenance.

Queries can take place during the move, but right after the move completes, the indexes will all be unusable so queries will start failing at that point until you rebuild them.This approach is totally transactional—as opposed to EXP and IMP (any time you take the data out of the database, I get nervous, because you might lose that data).The takes this responsibility from you—you can have the database do all of the bookkeeping, making sure the redefined table has all of the needed grants, indexes, constraints, triggers, and so on—to make it a perfect copy of the original. For 3.5GB, either approach is going to be pretty fast regardless; 3.5GB is not very large these days.The second example, a query against select * from table(dbms_xplan.display); PLAN_TABLE_OUTPUT ------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost | ------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | | | | | 1 | MERGE JOIN | | | | | | 2 | SORT JOIN | | | | | |* 3 | TABLE ACCESS FULL | T2 | | | | |* 4 | SORT JOIN | | | | | | 5 | TABLE ACCESS FULL | T1 | | | | ------------------------------------------------------------------------- Predicate Information (identified by operation id): ---------------------------------------------------------- 3 - filter("T2"."USERNAME"=' FRED') 4 - access("T1"."USER_ID"="T2"."USER_ID") filter("T1"."USER_ID"="T2"."USER_ID") Oracle Database just rolled our text directly into the query itself, optimizing it as if the view didn't even exist. Code Listing 3: Query against V3 select * from table(dbms_xplan.display); PLAN_TABLE_OUTPUT --------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost | --------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | | | | | 1 | VIEW | V3 | | | | | 2 | SORT ORDER BY | | | | | | 3 | MERGE JOIN | | | | | | 4 | SORT JOIN | | | | | |* 5 | TABLE ACCESS FULL | T2 | | | | |* 6 | SORT JOIN | | | | | | 7 | TABLE ACCESS FULL | T1 | | | | --------------------------------------------------------------------------- Predicate Information (identified by operation id): --------------------------------------------------------- 5 - filter("T2"."USERNAME"=' FRED') 6 - access("T1"."USER_ID"="T2"."USER_ID") filter("T1"."USER_ID"="T2"."USER_ID") step, indicating that the view was not merged.Because I requested the rows to be ordered, I could not merge that step.

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