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5 On the PGA tab, you will see the target (set to 10 MB) and the actual allocated PGA, which will be higher The Advice button will show a graphical representation of a query against V$PGA_TARGET_ADVICE 6 Enable Automatic Memory Management by clicking the Enable button at the top of the Memory Advisors window This will display the value of MEMORY_MAX_TARGET, along with a possible memory size, and suggest a value for MEMORY_TARGET In the following illustration, these values are 300 MB and 166 MB
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7 Leave the memory parameters on default, and click OK 8 The memory advisor will now be available: click the Advice button to see the suggested value for the target 9 Return the instance to the original memory configuration (as it was before Exercise 14-1) by shutting it down and restarting
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First, the terminology Ideally, all objects have a status of valid PL/SQL objects, and views can become invalid; indexes can become unusable Depending on the reason for an object becoming invalid, it may become valid automatically when next accessed Unusable indexes must be made valid by rebuilding, which does not occur automatically
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Stored PL/SQL is code stored and compiled within the data dictionary, as PL/SQL objects These can be
Procedures Functions Triggers Packages Object types
Most, if not all, of these procedural objects will refer to data objects, such as tables When a procedural object is compiled, the compiler checks the data objects to which it refers in order to confirm that the definition is correct for the code For example, if the code refers to a column, the column must exist or the code will not compile If any of the data objects to which a procedural object refers change after the procedural object has been compiled, then the procedure will be marked INVALID Procedural objects may also be invalid for more mundane reasons: perhaps the programmer made a simple syntactical mistake In that case, the object will be created INVALID and will be useless The same situation can occur with views When created, they may be fine, but they will be invalidated if the detail tables on which they Oracle will always are based have their definitions changed attempt to recompile invalid PL/SQL Objects can be created invalid because objects and views automatically, but this of programmer error, or they can become may not succeed You do not have to do it invalid some time after creation The view manually though it may be advisable to DBA_OBJECTS (and the derived views do so ALL_OBJECTS and USER_OBJECTS) has a column, STATUS, which should ideally always be VALID To identify all invalid objects in the database, as user SYSTEM run the query
select owner,object_name,object_type from dba_objects where status='INVALID';
If any objects are listed by this query, the first question to ask is whether the object was ever valid It may never have worked and not be needed, in which case the best thing to do may be to drop it But if, as is likely, you do not know if the
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object was ever valid, then a sensible first step is to attempt to compile it The first time an invalid object is accessed, Oracle will attempt to compile it automatically but if the compilation fails, the user will receive an error Clearly, it is better for the DBA to compile it first; then, if there is an error, he/she can try to fix it before a user notices Even if the object does compile when it is accessed, there may be a delay while the compilation takes place; it is better for perceived performance if this delay is taken by the DBA in advance To repair invalid objects, attempt to compile them The syntax is
ALTER object_type object_name COMPILE ;
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