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That single parameter reduces the possibility of an ORA-01555 error greatly (when it is set appropriately!) When using manual undo management, it is also important to remember that the probability of an ORA-01555 error is dictated by the smallest undo segment in your system, not the largest and not the average Adding one big undo segment will not make this problem go away It only takes the smallest undo segment to wrap around while a query is processing, and this query stands a chance of an ORA01555 error This is why I was a big fan of equi-sized rollback segments when using the legacy rollback segments In this fashion, each undo segment is both the smallest and the largest This is also why I avoid using optimally sized undo segments.

We need to be able to recognize where we need to do this and, perhaps as important, where we do not need to do this (I present an example of when not to shortly) Additionally, this does not lock the resource from other people reading the data as it might in other databases, hence this solution will scale very well Issues such as the one described in this section have massive implications when you re attempting to port an application from database to database (I return to this theme a little later in the chapter), and this trips people up time and time again For example, if you are experienced in other databases where writers block readers and vice versa, then you may have grown reliant on that fact to protect you from data integrity issues.

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By default, Oracle doesn t guarantee undo retention; the default retention time is 900 seconds (15 minutes) if you decide to guarantee undo retention.

If you shrink an undo segment that was forced to grow, you are throwing away a lot of undo that may be needed right after that It discards the oldest undo data when it does this, minimizing the risk, but still the risk is there I prefer to manually shrink undo segments during off-peak times if at all I am getting a little too deep into the DBA role at this point, so we ll move on to the next case It s just important that you understand that the ORA-01555 error in this case is due to the system not being sized correctly for your workload The only solution is to size correctly for your workload It is not your.

You can specify guaranteed undo retention for the undo tablespace when you create the database, or by specifying the RETENTION GUARANTEE clause while creating a new undo tablespace, as shown here: SQL> CREATE UNDO TABLESPACE undotbs01 2 DATAFILE 3 '/u01/orcl/oradata/undotbs01_01.dbf' 4 SIZE 10M AUTOEXTEND ON 5* RETENTION GUARANTEE; Tablespace created. SQL> You can also use the ALTER TABLESPACE command to guarantee undo retention in your database, as shown here: SQL> ALTER TABLESPACE undotbs01 RETENTION GUARANTEE; You can use the RETENTION NOGUARANTEE clause to turn off the guaranteed retention of undo information, as shown in the following example: SQL> ALTER TABLESPACE undotbs01 RETENTION NOGUARANTEE;

The lack of concurrency is one way to protect yourself from this that is how it works in many non-Oracle databases In Oracle, concurrency rules supreme and you must be aware that, as a result, things will happen differently (or suffer the consequences)..

A high value for the UNDO_RETENTION parameter doesn t guarantee the retention of undo data for the duration specified by the UNDO_RETENTION parameter. You must use the RETENTION GUARANTEE clause to guarantee undo retention for a specified time.

fault, but it is your problem since you hit it It s the same as if you run out of temporary space during a query You either configure sufficient temporary space for the system, or you rewrite the queries so they use a plan that does not require temporary space To demonstrate this effect, we can set up a small, but somewhat artificial test We ll create a very small undo tablespace with one session that will generate many small transactions, virtually assuring us that it will wrap around and reuse its allocated space many times regardless of the UNDO_RETENTION setting, since we are not permitting the undo tablespace to grow The session that uses this undo segment will be modifying a table, T It will use a full scan of T and read it from top to bottom.

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