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Note that the information is displayed in a dynamic performance view, not the data dictionary view DBA_TABLESPACES, because flashback is enabled through the controlfile, not in the data dictionary Candidate tablespaces for excluding from flashback are tablespaces where you can tolerate a long period of downtime in comparison to the rest of the database; tablespaces you can drop whenever you please; or tablespaces that can be restored and recovered very quickly If one or more tablespaces are not generating flashback data, then before carrying out a flashback operation the files making up the tablespaces must be taken offline Then the flashback, including the implicit recovery, can proceed as normal Remember that offline datafiles are ignored by RECOVER it is the same with FLASHBACK You will not be able to open the database (with or without RESETLOGS) until you have either dropped the datafiles making up the off-lined tablespaces, or restored and recovered them to the same point as the flashback To drop them is a drastic action, but if it is a tablespace that you can just drop and recreate, and reinstantiate the objects within it, then this will minimize the downtime Otherwise, after the flashback bring the datafiles making up the tablespace online Then restore them, and do an incomplete recovery up to the time to which you flashed back This will synchronize all the datafiles, and you can then open them with RESETLOGS TIP Excluding some tablespaces from flashback logging will help with online performance, but the price you pay is that you will have to do a partial restore as part of the recovery process This will generally still be quicker than the full restore needed for an incomplete recovery

Accidentally dropping a table is very easy to do It is not just that you can drop the wrong table because of a typing error it could be the right table, but you are connected to the wrong schema, or logged on to the wrong instance You can reduce the likelihood of this by setting your SQL*Plus prompt, for example,

Normally, you can fill layers in Photoshop with patterns or textures by choosing Edit | Fill and selecting Pattern from the Use menu However, if you try to choose Edit | Fill when a type layer is currently active in the Layers palette, you ll notice that option is grayed out and not available

TIP To set your sqlprompt automatically for all SQL*Plus sessions, put the preceding command into the gloginsql file, in the ORACLE_HOME/sqlplus/ admin directory PART III Flashback Drop lets you reinstate a previously dropped table (but not a truncated table!) exactly as it was before the drop All the indexes will also be recovered, and also any triggers and grants Unique, primary key, and not-null constraints will also be recovered but not foreign key constraints EXAM TIP The Flashback Drop command applies only to tables, but all associated objects will also be recovered except for foreign key constraints

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Instead, you can apply the Pattern Overlay layer style on your type layer Figure 7-10 shows an example, and the following tip provides the details To apply a pattern to text, first use the Type tool to create a new text layer in Photoshop Choose Window | Layers to make sure the Layers palette is visible, and click once on the text layer in question to make it active Then, click the first button at the bottom of the Layers palette and select Pattern Overlay, or choose Layer | Layer Style | Pattern Overlay to reveal the following options