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CHAPTER 6 MA NAGING TA BLESPA CES
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You can assign a user a tablespace quota, thus limiting the user to a certain amount of storage space in the tablespace. You can do this when you create the user, or by using the ALTER USER statement at a later time. 11 shows you how to assign tablespace quotas to users. In 9, I discuss Oracle s Resumable Space Allocation feature. User-quota-exceeded errors are an important type of resumable statement. When a user exceeds the assigned quota, Oracle will automatically raise a space-quota-exceeded error.
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Proactive Tablespace Space Alerts
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If a segment needs to be extended to accommodate the insertion of new data, there must be free space available in the tablespace that the segment belongs to. If not, the new data can t be inserted, and you ll get an Oracle error indicating that the operation failed due to the lack of space in the tablespace. You can write scripts to alert you that a tablespace is about to run out of space, but the database itself can send you proactive space alerts for all locally managed tablespaces, including the undo tablespace. The Oracle database stores information on tablespace space usage in its system global area (SGA). The new Oracle background process MMON checks tablespace usage every ten minutes and raises alerts when necessary. The database will send out two types of tablespace out-of-space alerts: a warning alert and a critical alert. The warning alert cautions you that a tablespace s free space is running low, and the critical alert tells you that you should immediately take care of the free space problem so the database doesn t issue out of space errors. Both of these alerts are based on threshold values called warning and critical thresholds, which you can modify.
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Tip When you upgrade to Oracle Database 11g, by default, both the percent full and the bytes remaining alerts are disabled. You must explicitly set both alerts yourself. For a given tablespace, you can use either or both types of alerts.
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Types of Alert Thresholds
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There are two ways to set alert thresholds: you can specify that the database alert be based on the percent of space used or on the number of free bytes left in the tablespace: Percent full: The database issues an alert when the space used in a tablespace reaches or crosses a preset percentage of total space. For a new database, 85 percent full is the threshold for the warning alerts, and 97 percent full is the threshold for the critical alerts. You can, if you wish, change these values and set, for example, 90 and 98 percent as the warning and critical thresholds. Bytes remaining: When the free space falls below a certain amount (specified in KB), Oracle issues an alert. For example, you can use a warning threshold of 10,240KB and a critical threshold of 4,096KB for a tablespace. By default, the bytes remaining alerts (both warning and critical) in a new database are disabled, since the defaults for both types of bytesremaining thresholds are set to zero. You can set them to a size you consider appropriate for each tablespace.
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You can disable the warning or critical threshold tablespace alerts by setting the threshold values to zero.
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CHAPTER 6 MA NAGING TA BLESPA CES
Setting the Alert Thresholds
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 and select 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 6-4 shows how you can set a bytes remaining alert threshold using the warning value and the critical value attributes. Listing 6-4. 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> In Listing 6-4, 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 datafile 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 outof-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 datafile when you create or alter a tablespace. Just make sure that you have enough free storage to accommodate the autoextensible datafile.
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