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SQL> alter procedure hradd_reg compile;
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will attempt to compile the procedure ADD_REG in the HR schema, and the statement
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SQL> alter view rname compile;
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will compile the view RNAME If the compilation succeeds, you have no further problems If it fails, then you need to work out why If a procedure does not compile, use the SQL*Plus command SHOW ERRORS to see why not (unfortunately, SHOW ERRORS is not supported for views) Often a useful starting point in identifying the cause of compilation errors is to use the DBA_DEPENDENCIES view, described here:
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SQL> desc dba_dependencies; Name --------------------------------OWNER NAME TYPE REFERENCED_OWNER REFERENCED_NAME REFERENCED_TYPE REFERENCED_LINK_NAME DEPENDENCY_TYPE Null -------NOT NULL NOT NULL Type ------------VARCHAR2(30) VARCHAR2(30) VARCHAR2(17) VARCHAR2(30) VARCHAR2(64) VARCHAR2(17) VARCHAR2(128) VARCHAR2(4)
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For every object, identified by NAME, there will be rows for each object on which it depends For example, if a view retrieves columns from a dozen tables, they will each be listed as a REFERENCED_NAME If a view does not compile, then investigating these tables would be sensible
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There will be occasions when you are faced with the need to recompile hundreds or thousands of invalid objects Typically, this occurs after an upgrade to an application, or perhaps after applying patches Rather than recompiling them individually, use the supplied utility script On Unix,
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SQL> @ /rdbms/admin/utlrp
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SQL> @ \rdbms\admin\utlrp
This script, which should be run when connected AS SYSDBA, will attempt to compile all invalid objects If after running it there are still some invalid objects, you can assume that they have problems that should be addressed individually
Unusable Indexes
If a procedural object, such as a stored PL/SQL function or a view, becomes invalid, the DBA does not necessarily have to do anything: the first time it is accessed, Oracle will attempt to recompile it and this may well succeed But if an index becomes unusable for any reason, it must always be repaired explicitly before it can be used An index consists of the index key values, sorted into order, each with the relevant rowid The rowid is the physical pointer to the location of the row to which the index key refers If the rowids of the table are changed, then the index will be marked as unusable This could occur for a number of reasons Perhaps the most common is that the table has been moved, with the ALTER TABLE MOVE command This will change the physical placement of all the rows, and therefore the index entries will be pointing to the wrong place Oracle will be aware of this and will therefore not permit use of the index In earlier releases of the Oracle database, it was more than likely that users would detect unusable indexes because their sessions would return errors When executing SQL statements, if the session attempted to use an unusable index, it would immediately return an error, and the statement would fail From release 10g and higher the database changes this behavior If a statement attempts to use an unusable index, the statement will revert to an execution plan that does not require the index Thus, statements will always succeed but perhaps at greatly reduced performance This behavior is controlled by the instance parameter SKIP_UNUSABLE_INDEXES, which defaults to TRUE The exception to this is if the index is necessary to enforce a constraint: if the index on a primary key column becomes unusable, the table will be locked for DML
14:
Performance Management
If you wish your database to react as earlier releases, where unusable indexes would cause errors, issue the command ALTER SYSTEM SET SKIP_ UNUSABLE_INDEXES=FALSE; To detect indexes that have become unusable, query the DBA_INDEXES view:
SQL> select owner, index_name from dba_indexes where status='UNUSABLE';
Indexes are marked unusable if the rowid pointers are no longer correct To repair the index, it must be recreated with the ALTER INDEX REBUILD command This will make a pass through the table, generating a new index with correct rowid pointers for each index key When the new index is completed, the original, unusable index is dropped While an index rebuild is in progress, additional storage space is required; plan ahead to make sure it is available
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