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Import functions table for KERNEL32.dll: 0 _CorExeMain Generally, an assembly built with /clr:pure has only one load-time dependency, which is always mscoree.dll. For now, it is sufficient to know that the DLL mscoree.dll implements the startup logic of the CLR. (Details of CLR startup will be discussed in 12.) Even though only mscoree.dll is listed as a load-time dependency, the other DLLs are still needed to run the application. However, they are loaded on demand at runtime. 9 discusses how this is done. Loading the dependent DLLs on demand causes changes in the order in which the DLLs are loaded and initialized. This can easily create unintended side effects. Again, this is a good reason to choose /clr instead of /clr:pure. For extending DLL projects, you are forced to compile with /clr, because /clr:pure does not support exporting functions. Consider the following source code: __declspec(dllexport) void f() { /* ... */ } When you try to compile this source code with /clr:pure, you will get a compiler error stating that __declspec(dllexport) cannot be used with /clr:safe or /clr:pure. In general, functions compiled with /clr:pure or /clr:safe cannot be called by a native caller. Details of this restriction will be discussed in 9.

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If the CHECK_OBJECT procedure populates any rows into your repair table (repair_table), then it s time to fix it using the procedure FIX_CORRUPT_BLOCKS. Listing 24-11 shows how to use the FIX_CORRUPT_BLOCKS procedure. Once you run it, you use the SKIP_CORRUPT_BLOCKS procedure so Oracle can skip the corrupted blocks. Listing 24-11. Using the DBMS_REPAIR.FIX_CORRUPT_BLOCKS Procedure SQL> DECLARE num_fix INTEGER; 2 BEGIN 3 num_fix := 0; 4 DBMS_REPAIR.FIX_CORRUPT_BLOCKS( 5 schema_name => 'HR', 6 object_name => 'EMPLOYEES', 7 object_type => dbms_repair.table_object, 8 repair_table_name => 'REPAIR_TABLE', 9 fix_count => num_fix); 10 END; PL/SQL procedure successfully completed. SQL>

The DBMS_OUTLN and DBMS_OUTLN_EDIT packages are used to manage stored plan outlines, thereby helping to stabilize the cost-based optimizer (CBO). The packages contain several procedures, as shown in Listing 24-12. Listing 24-12. The DBMS_OUTLN Package SQL> DESC DBMS_OUTLN Argument Name Type In/Out Default ------------------------------ --------- ------ -------PROCEDURE CLEAR_USED PROCEDURE DROP_BY_CAT PROCEDURE DROP_COLLISION PROCEDURE DROP_UNUSED PROCEDURE EXACT_TEXT_SIGNATURES PROCEDURE CREATE_EDIT_TABLES PROCEDURE DROP_EDIT_TABLES SQL>

You need to take a couple of preliminary steps before you can use the DBMS_OUTLN package to manage outlines. First, you need to grant certain privileges to the user who wants to use the outlines. Next, you should enable the creation of outlines by using either an initialization parameter or the ALTER SESSION command. In the following example, you ll make all the changes in the parameters at the session level by using the ALTER SESSION command. Listing 24-13 demonstrates all the necessary commands to enable the creation of plan outlines. Listing 24-13. Setting the Parameters for Using Stored Outlines SQL> GRANT CREATE ANY OUTLINE TO hr; Grant succeeded. SQL> ALTER SESSION SET create_stored_outlines =true; Session altered. /* Run the application, so you can capture the stored outlines */ SQL> ALTER SESSION SET create_stored_outlines = false; /* The above statement will suspend the generation of outlines */ Session altered. SQL> ALTER SESSION SET use_stored_outlines = true; Session altered. SQL> Oracle saves the outlines of all SQL statements that the user hr executes after the CREATE_ STORED_OUTLINES parameter is set to TRUE. The outlines are stored in the OUTLN user s schema. The following example shows the main tables in the OUTLN user s schema. The default location for the OUTLN user s tables is the System tablespace. Using the outlines in the OUTLN tables OL$ and OL$HINTS, Oracle populates the dictionary views USER_OUTLINES and USER_OUTLINES_HINTS.

if test $curr_age -gt $value -a $curr_age -lt $errval then notify "Warning" $killoption $process $pid \ $curr_age $value "minutes of elapsed time" elif test $curr_age -ge $errval

SQL> SELECT sid, blocking_session, username, event 2 FROM v$session 3* WHERE blocking_session_status = 'VALID'; SID BLOCKING_SESSION USERNAME EVENT --- -------------------------------------------------------24 32 SALAPATI enq: TX - row lock contention SQL> The previous query shows that the user with the SID 24 is being blocked by user with the SID 32. The event column shows the type of lock that the blocking session holds.

The data dictionary tables that you need to look at to find locking information are the DBA_LOCKS, DBA_BLOCKERS, and DBA_WAITERS views. If, for some reason, you don t see the DBA_BLOCKERS view, run the catblock.sql script, located in the $ORACLE_HOME/rdbms/admin directory, to create it.