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Note that in the older manual undo management mode, DBAs don t have the option of determining how long Oracle retains undo information Let s briefly review how undo information is managed in an undo segment Undo information can be classified in two broad types: If a transaction that has generated the undo data is still active, the undo data is said to be active (uncommitted) Oracle will always retain active undo data to support ongoing uncommitted transactions If the transaction that generated the undo data is inactive (committed), then the undo data is said to be committed The committed undo data can be either expired or unexpired Expired data can be overwritten by new transactions Oracle will try to save the unexpired data as long as it can, subject to undo space limitations.

0:00 0:01

When there is no more room in the undo tablespace for newer transactions, Oracle will finally overwrite the unexpired data, depending on how you configure the UNDO_RETENTION parameter The UNDO_RETENTION parameter lets you control the reuse of the committed undo space By setting the UNDO_RETENTION parameter, you can specify the lower limit for how long the database will retain uncommitted undo data as unexpired data, so that it is available for read consistency and Flashback purposes Note that setting the UNDO_RETENTION interval is not a guarantee that Oracle will always retain undo information for at least that time period If there is no free space left in the undo tablespace for.

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There are a lot of datatypes to choose from. This chapter explores each of the 22 built-in datatypes, explaining how they are implemented, and how and when to use each one. First up is a brief overview of National Language Support (NLS), a basic knowledge of which is necessary to fully understand the simple string types in Oracle. We then move on to the ubiquitous NUMBER type and look at the new Oracle 10g options for storage of numbers in the database. The LONG and LONG RAW types are covered, mostly from a historical perspective. The main objective here is to show how to deal with legacy LONG columns in applications and migrate them to the LOB type. Next, we delve into the various datatypes for storing dates and time, investigating how to manipulate the various datatypes to get what we need from them. The ins and outs of time zone support are also covered.

a new transaction, Oracle will use an unexpired undo extent a transaction can t be stopped, after all. This is a last-resort event, but you should be aware that it is a possibility. The key is to make the undo tablespace big enough so that it can support your undo retention interval, thus helping Oracle retain undo information for the specified period. You can set the undo retention size by specifying it in the initialization file as follows: UNDO_RETENTION = 1800 The default for the UNDO_RETENTION parameter is 900 seconds.

Our query begins. Another session UPDATEs block 1,000,000. Undo information for this is recorded into some undo segment. This UPDATE session COMMITs. The undo data it generated is still there, but is now subject to being overwritten if we need the space. Our query is still chugging along. It is at block 200,000. Lots of activity going on. We have generated a little over 14MB of undo by now. Our query is still going strong. We are at block 600,000 or so by now. Our undo segments start to wrap around and reuse the space that was active when our query began at time 0:00. Specifically, we have just reused the undo segment space that the UPDATE to block 1,000,000 used back at time 0:01. Our query finally gets to block 1,000,000. It finds it has been modified since the query began. It goes to the undo segment and attempts to find the undo for that block to get a consistent read on it. At this point, it discovers the information it needs no longer exists. ORA-01555 is raised and the query fails.

Your undo tablespace must be able to accommodate any increase in the undo retention period. If the undo tablespace can t keep undo records for the required time, you run the risk of queries failing with the snapshot-tooold error.

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