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The easiest way to set and modify tablespace space alerts is by using the Oracle Enterprise Manager (OEM). Just go to the OEM Home Page Administration Related Links Manage Metrics Edit Thresholds. From the Edit Thresholds page, you can set warning and critical thresholds for your tablespaces. You can also specify a response action when an alert is received, in the form of a command or script that is made accessible to the Management Agent. You can also use the Oracle-provided PL/SQL package DBMS_SERVER_ALERT to set warning and critical space alerts. Listing 5-4 shows how you can set a bytes remaining alert threshold using the warning value and the critical value attributes. Listing 5-4. Setting a Tablespace Alert Threshold SQL> BEGIN DBMS_SERVER_ALERT.SET_THRESHOLD( metrics_id => DBMS_SERVER_ALERT.TABLESPACE_BYT_FREE, warning_operator => DBMS_SERVER_ALERT.OPERATOR_LE, warning_value => '10240', critical_operator => DBMS_SERVER_ALERT.OPERATOR_LE, critical_value => '2048', observation_period => 1, consecutive_occurrences => 1, instance_name => NULL, object_type => DBMS_SERVER_ALERT.OBJECT_TYPE_TABLESPACE, object_name => 'USERS'); END; SQL>

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In Listing 5-4, note that the warning_value attribute sets the bytes-remaining alert warning threshold at 10MB and the critical_value attribute sets the critical threshold at 2MB. You can always add a data file to a tablespace to get it out of the low-free-space situation. However, one easy way to avoid this problem altogether, in most cases, is to use autoextensible tablespaces. Autoextensible tablespaces will automatically grow in size when table or index data grows over time. For a new database, this may prove to be an excellent solution, saving you from out-of-space errors if you create tablespaces that are too small and from wasting space if you create too large a tablespace. It s very easy to create an autoextensible tablespace all you have to do is include the AUTOEXTEND clause for the data file when you create or alter a tablespace. Just make sure that you have enough free storage to accommodate the autoextensible data file.

In previous versions of Oracle, you couldn t rename tablespaces, which meant that you had to drop and re-create tablespaces when you performed operations like migrating from dictionary-managed to locally managed tablespaces. Oracle Database 10g lets you rename tablespaces by using the ALTER TABLESPACE command, as shown here: SQL> ALTER TABLESPACE test01 RENAME TO test02; Tablespace altered. SQL> You can rename both permanent and temporary tablespaces, but there are a few restrictions: You can t rename the System and Sysaux tablespaces. The tablespace being renamed must have all its data files online. If the tablespace is read-only, renaming it doesn t update the file headers of its data files. Sometimes, you may need to rename a data file. The process for this is straightforward: 1. Take the data file offline by taking its tablespace offline. Use the following command: SQL> ALTER TABLESPACE test01 OFFLINE NORMAL; Tablespace altered. SQL> 2. Rename the file using an operating system utility such as cp or mv in UNIX, or copy in Windows. $ cp /u01/app/oracle/test01.dbf /u02/app/oracle/test01.dbf

3. Rename the data file in the database by using the following command: SQL> ALTER TABLESPACE test01 2 RENAME DATAFILE 3 '/u01/app/oracle/test01.dbf' 4 TO 5* '/u02/app/oracle/test01.dbf'; Tablespace altered. SQL>

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By default, all Oracle tablespaces are both readable and writable when created. However, you can specify that a tablespace cannot be written to by making it a read-only tablespace. The command to do so is simple:

SQL> ALTER TABLESPACE test01 READ ONLY; If you want to make this read-only tablespace writable again, you can use the following command: SQL> ALTER TABLESPACE test01 READ WRITE;

#pragma unmanaged is not recommended. In the context of templates, they are often even more misleading. The following code shows a typical attempt to compile a template to native code even though it is used by managed code: // templatesAndPragmaUnmanaged.cpp // build with: cl /clr templatesAndPragmaUnmanaged.cpp #pragma managed (push, off) #include <vector> #pragma managed (pop) using namespace std; int main() { vector<int> vi; vi.push_back(5); } If you build this application, members of the template std::vector such as the push_back function will be compiled to native code. However, if there is a second source file in the project that compiles vector<int>::push_back to managed code, the linker will choose the managed variant instead of the native one when it generates the code for main. Even though you have included the vector in a native section of your source file, the managed variant will be chosen. If you want to ensure that a template is compiled to native code, make sure that you call it from a source file compiled to native code.