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All Oracle Database 10g tablespaces have built-in alerts that will notify you if their free space drops below a set threshold. The two default thresholds are critical and warning. The MMON background process monitors the free space in each tablespace and sends out the alerts. Oracle will, by default, alert you with a warning when your tablespace is at 85 percent of capacity and will send a critical alert when the tablespace is at 97 percent of capacity. However, you can turn the alerting mechanism off if you want. To view information on your thresholds, see the DBA_THRESHOLDS view.

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If you are migrating to Oracle Database 10g, Oracle turns off the automatic tablespace alerting mechanism by default. If you want to set the alert thresholds, use the DBMS_SERVER_ALERT package.

Here s a simple example that shows how to use the DBMS_SERVER_ALERT package to set warning and critical thresholds and trigger alerts when either of the thresholds is crossed. You ll see how to set, view, and clear an alert. 1. Create a small tablespace to use for testing the Oracle alert mechanism: SQL> CREATE TABLESPACE test DATAFILE 'test01.dbf' size 10M EXTENT MANAGEMENT LOCAL UNIFORM SIZE 3M; Tablespace created. 2. Set your tablespace alert thresholds as follows (warning alert at 80 percent full and critical at 95 percent full): SQL> EXECUTE DBMS_SERVER_ALERT.SET_THRESHOLD(> dbms_server_alert.tablespace_pct_full,dbms_server_alert.operator_ge,'80',> dbms_server_alert.operator_ge,'95',1,1,null,> dbms_server_alert.object_type_tablespace,'TEST'); PL/SQL procedure successfully completed. SQL> 3. Create a new table using the following SQL statement. (This will set off an alert because the MINEXTENTS 3 clause for the new table will cause the tablespace to cross its warning threshold of 80 percent full): SQL> CREATE TABLE test_table (name varchar2(30)) TABLESPACE test STORAGE (MINEXTENTS 3); Table created. SQL> 4. You can verify the tablespace alert as follows (though you may not see the alert immediately, since the MMON process has to gather the alert information first): SQL> SELECT reason FROM dba_outstanding_alerts; REASON -------------------------------------Tablespace [TEST] is [88 percent] full SQL>

5. You can clear the alert by increasing the size of the data file that is part of the test tablespace and see what happens to the alert by querying the DBA_OUTSTANDING_ALERTS view. You ll find that the alert is gone from that view, since it has been cleared. SQL> ALTER TABLESPACE test ADD DATAFILE 'test02.dbf' size 5M; Tablespace altered. SQL> SQL> SELECT reason FROM dba_outstanding_alerts; no rows selected SQL> 6. All cleared alerts will show up in the DBA_ALERT_HISTORY view. You can verify that the cleared tablespace alert is in that view by using the following query. SQL> SELECT reason, resolution FROM dba_alert_history; REASON RESOLUTION ----------------------------------------------------------Tablespace [TEST] is [88 percent] full cleared SQL>

When an assembly is modified after it has been signed, the verification of the signature will fail To create a new key pair, a NET tool called SNEXE is used The command-line option /k of this tool creates a new key file, as follows: SN k keyfilesnk Using the linker option /KEYFILE:<keyfile>, an assembly can get a strong name If you want to create a signed SampleLibdll assembly, you can simply rebuild it with the following command lines: CL /c /clr:safe SampleLibcpp LINK /DLL /KEYFILE:keyfilesnk SampleLibobj In Visual C++ projects, there is a special project property for specifying the key file You can find this setting via Project Properties Configuration Properties Linker Advanced Key File If you have multiple projects in your solution, you will likely want all projects to use the same key file.