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Oracle DBAs have traditionally used a large number of tablespaces for managing database objects. Unfortunately, the larger the number of tablespaces in your database, the more time you ll have to spend on mundane tasks, such as monitoring space and allocating space to the tablespaces. Disk contention between indexes and tables and other objects were pointed out as the reason for creating large numbers of tablespaces, but with the types of disk management used today in most places, where Logical Volume Managers stripe operating system files over several disk spindles, traditional tablespace-creation rules don t apply. You re better off using a very small number of tablespaces perhaps just four or five to hold all your data.
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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 6, 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 in Oracle Database 10g the database itself sends 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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CHAPTER 5 SCHEMA MANAGEMENT
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When you upgrade to Oracle Database 10g, 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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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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