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This article is about how to use Oracle tablespace design to improve database performance. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Typical application 1: control the quota of tablespace occupied by users

In some large database applications, we need to control the disk space occupied by a user or a group of users. This is like in a file server, you need to set a disk quota for each user to prevent hard disk space from running out. Therefore, in the database, we also need to limit the amount of disk space that users can use. To achieve this, we can do it through tablespaces.

We can create different tablespaces in the Oracle database, set the maximum storage capacity for them, and then assign users to this tablespace. In this case, the storage capacity of this user is limited by the size of the tablespace.

Typical application 2: controlling the disk space occupied by the database

Sometimes, in an Oracle database server, more than one service may be running. In addition to the database server, there may be application servers such as mail servers. To this end, it is necessary to make a plan for the disk space of the Oracle database, otherwise, when the disk space occupied by multiple application services increases infinitely, each service may eventually stop because of the depletion of hard disk space. Therefore, when using multiple application services on the same server, we often need to plan and allocate disk space to them first. None of the services can exceed the maximum amount we have assigned to him, or remind us in time after the limit is exceeded. Only in this way can we avoid the collapse of various application services caused by the exhaustion of disk space.

Typical application 3: flexibly place the table space to improve the input and output performance of the database

Database administrators can also put different types of data into different tablespaces, which can significantly improve the performance of database input and output, which is conducive to data backup and recovery and other management work. Because we database administrators can back up data by tablespace when backing up or restoring data. For example, when designing a background database of a large distribution system, we can set up tablespaces by province. The data files related to Zhejiang Province are placed in the tablespace of Zhejiang Province, while the business records occurring in Beijing are recorded in the tablespace of Beijing. In this way, when there is an error in the business data of Zhejiang Province, you can directly restore the tablespace of Zhejiang Province. Obviously, this design avoids the impact on other tablespaces when there is an error in the data in one tablespace that needs to be recovered.

In addition, tablespaces can be backed up independently. When the database capacity is relatively large, if the entire database is backed up at once, it will obviously take up more time. Although the Oracle database supports hot backup, it will occupy more system resources during the backup period, resulting in a decline in database performance. For this reason, when the database capacity is relatively large, we need to set up multiple table spaces, and then plan the backup time of each table space, so as to improve the backup efficiency of the whole database and reduce the impact of backup on the normal operation of the database.

Typical application 4: sort operation of large table

As we all know, when there are more records in the table, it is slower to query them. After the first query is successful, it still takes so much time to reorder it a second time. For this reason, when we design the database, for this kind of table object with large capacity, we often put it in a separate table space to improve the performance of the database.

Typical application 5: separate log files from data files to improve database security

By default, log files are stored in the same tablespace as data files. However, this is not very good for database security. Therefore, in the process of database design, we often like to put log files, especially redo log files, in a separate tablespace, and then store it on another hard disk. In this way, when the hard disk that stores the data files fails, the database can be repaired immediately through the redo log files stored in another table space, so as to reduce the loss caused by data loss.

Of course, the advantages of table space are not only these, the higher the performance requirements of the database, or the larger the database capacity, the greater the advantage of table space.

Next, let's take a specific look at the handling of tablespaces in Oracle databases to see if they have sufficient advantages to compete with SQL Server databases in terms of performance and security.

When designing the database, we recommend that the database administrator set the tablespaces in the following order.

Step 1: create a tablespace.

When designing a database, you first need to design the tablespace. We need to consider whether to create only one table space or multiple table spaces, as well as the location of each table space, disk limits, and so on.

In the end, how many table spaces are reasonable, there is no unified statement, which is mainly based on the actual needs of the enterprise to judge. If the enterprise needs to control the disk quota of users, it needs to set the tablespace according to the number of users. When the data capacity of an enterprise is relatively large, and it has relatively high requirements for the performance of the database, it is necessary to set up different table spaces according to different types of data in order to improve its input and output performance.

Step 2: create the user and establish the user's default tablespace.

When creating a user, we recommend that the database administrator specify the user's default tablespace. Because when we use the create statement to create database objects, such as database tables, they are stored in the current default space of the database by default. If you do not specify the user default tablespace, the user has to specify the tablespace every time they create a database object, which is obviously not very reasonable.

Also note that different tablespaces have different permission controls. Users have full control over tablespace A, and may only have query permissions for tablespace B, or even join permissions. Therefore, reasonably configuring the access rights of tablespaces for users is also a way to improve database security.

Thank you for reading! On "how to use Oracle tablespace design to improve database performance" this article is shared here, I hope the above content can be of some help to you, so that you can learn more knowledge, if you think the article is good, you can share it out for more people to see it!

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