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Always start the Oracle Enterprise Manager console before using any other products. Start the other products by following these steps: |
NOTE |
Right-clicking any database in the Navigator window will give the full list of managers under the Related Tools menu. This will save an extra step after the user becomes familiar with OEM. |
The Map window allows the DBA to organize objects such as databases, listeners, and nodes into groups that may be easier to use in a spatial setting. The window is initially completely blank. A map may be created by selecting Create Map from the Map menu. (See Figure 15.4.)
After choosing a map name , the user may click Use Background Bitmap to display a bitmap in the background of the Map window. This bitmap may be a standard Oracle bitmap that includes Asia, Europe, Japan, USA, and the world. The bitmap may also be a custom bitmap created with a bitmap editor such as Microsoft Paint. After the user clicks OK, the map is displayed in the Map window. The user may drag and drop objects from the Navigator window into the Map window. (See Figure 15.5.)
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The Job Control window has three tabs. The Active Jobs tab shows which jobs have been submitted but not yet completed. The Job History tab shows jobs that have run in the past. The Job Library tab shows jobs that the user has saved to the library for future use.
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NOTE |
Many jobs rely on Simple Network Management Protocol (SNMP) to function properly. Investigate SNMP settings on the database servers if jobs are submitted but never |
Clicking Create Job from the Job menu will create a new job. (See Figure 15.6.)
The General tab provides the name, description, and destination of the job. It also allows the job to be specified as a fixit job. A fixit job will be run only in response to a problem in the database. This particular job will perform a weekly export of the database HPSERVER.
The Tasks tab shows a list of all available actions that the job may perform. (See Figure 15.7.) This list is quite inclusive. It includes export, import, SQL*Plus, operating system commands, and more. Just about any possible task may be scheduled as a job.
The Parameters tab displays the parameters for all of the options that were picked in the Tasks tab. In the case of this particular job, the parameters for exporting from a database are displayed. (See Figure 15.8.)
The Schedule tab determines when the job is to be executed. The job may be run immediately, once in the future, or periodically. This particular job will be run every Sunday at 7:01 p.m. (See Figure 15.9.)
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The Event Management window of OEM allows agents to monitor the activity of the databases. The user may set defined limits to
Event management can occur on the node, the listener, or the database. Table 15.2 shows all of the options for each service type.
Table 15.2. Event Management options.
Service Type | Events | Description |
| | |
Node | UpDown | Node is up or down. |
CPU Utilization | CPU utilization is high | |
CPU Load | CPU load is high | |
CPU Paging | Paging rate is high | |
Disk Full | Disk is full | |
Swap Full | Swap area is full | |
Database | Alert | New errors are in the alert file. |
User Blocks | Database users have been blocked. | |
UpDown | Database is up or down. | |
Probe | A new database connection cannot be made. | |
Buffer Cache | Buffer cache hit ratio is low. | |
Chain Row | Chained rows exist. | |
Data Dictionary Cache | The data dictionary miss ratio is high. | |
Disk I/O | Disk I/O is high. | |
Library Cache | Library cache miss ratio is high. | |
Net I/O | SQL*Net I/O rate is high. | |
SysStat Table | Value of V$SYSSTAT parameter is high. | |
SysStat Table Delta | Difference between V$SYSSTAT parameter and defined value. | |
Response Time | Response time of user program is slow. |
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Service Type | Events | Description |
| | |
Datafile Limit | Exceeds data-file limit. | |
Lock Limit | Exceeds lock resource limit. | |
Process Limit | Exceeds process limit. | |
Session Limit | Exceeds session limit. | |
User Limit | Exceeds user limit. | |
Archive Full | The archive device is full. | |
Chunk Small | Contiguous free space is too small. | |
Dump Full | The dump destination device is full. | |
Maximum Extents | Segments are reaching maximum extents. | |
Listener | UpDown | SQL*Net Listener is up or down. |
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Consider supplementing monitoring scripts with the event-management system. Scripts are run on a periodic basis. Although they are good at noticing trends or problems that give early warning, they are almost worthless for problems that arise in a short period of time. For example, a segment might only have a few extents when the scripts are run the night before. During the day, a batch job is run that loads data into the table. This table may reach maxextents in a very short period of time. The nightly scripts would not report a problem; however, the event management of OEM would notice the problem and solve it or notify the DBA immediately. |
The Backup Manager allows the user to perform the following tasks: