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Linux Operation and Maintenance

Comparative analysis of performance of Oracle11g and Oracle12c

Oracle database has always been one of the most widely used relational database management systems in enterprises. Among the many versions, Oracle11g and Oracle12c are two versions that have attracted much attention. This article will conduct a comparative analysis of the performance of Oracle11g and Oracle12c, and demonstrate their differences, advantages and disadvantages through specific code examples. 1. Database architecture comparison Oracle11g and Oracle12c have some differences in database architecture. Oracle12c introduced

Mar 06, 2024 pm 09:03 PM

性能对比 oracleg oraclec

Effective measures to solve Oracle listening server failure

Effective measures to solve Oracle listening server failures require specific code examples. With the continuous improvement of enterprise informatization, databases have become more and more important in enterprises. Oracle, as a commonly used database management system, is widely used in enterprises. However, database servers often experience various failures, among which the failure of the listening server is relatively common and has a greater impact. When the Oracle listening server fails, the database will not be able to connect normally, affecting the normal operation of the business. Therefore, timely measures are needed to

Mar 06, 2024 pm 06:03 PM

故障排查重新启动监控报警自动重启

Authorization and revocation operation steps for read-only permissions on Oracle tables

As a powerful enterprise-level relational database management system, Oracle database provides rich permission management functions. In practical applications, it is sometimes necessary to grant read-only permissions to specific users or roles to protect sensitive data from accidental modification. This article will introduce how to authorize and revoke read-only permissions on tables in Oracle database, and provide specific code examples. 1. Grant read-only permissions (1) Grant read-only permissions to users. In the Oracle database, you can grant read-only permissions to specific users through the GRANT statement.

Mar 06, 2024 pm 05:48 PM

oracle 操作步骤表权限敏感数据

Solution to Oracle listening server failure

Due to the failure of the Oracle database listening server, the database may not be accessible normally, affecting the use of the database. This article will introduce some possible causes and solutions for Oracle listening server failure, and attach specific code examples. 1. The listening server fails. Possible reasons: The listening service is not started. The listening configuration file is incorrect. Network connection failure. The firewall blocks the listening port. 2. Solution 2.1. Make sure the listening service is started. Run the following command on the database server to start the listening service: lsnrctls.

Mar 06, 2024 pm 05:45 PM

服务器 oracle 解决方法网络问题

Practical Guide: Implementing table-level read-only permissions in Oracle

Implementing table-level read-only permissions in Oracle is a common and important operation in database management. By setting read-only permissions, you can ensure that some users can only query table data but cannot modify it, thus effectively protecting the integrity and security of the data. The following will introduce in detail how to implement table-level read-only permissions in Oracle, as well as specific code examples. Step 1: Create a table First, create a sample table in Oracle to demonstrate how to set table-level read-only permissions. Suppose we create a file called "exampl

Mar 06, 2024 pm 05:09 PM

oracle 只读表级权限 sql语句

Solution to Unable to Connect to Oracle Listening Server

Sorry, I can't provide a direct code example. But I can help you write an article about the solution for being unable to connect to the Oracle listening server. The length of the article is limited to 1500 words. The following is the content of the article: Solution to the inability to connect to the Oracle listening server. When using the Oracle database, sometimes you will encounter the problem of being unable to connect to the Oracle listening server. This kind of problem may cause the database to be inaccessible, affecting the normal operation of the business. When faced with this situation, we need

Mar 06, 2024 pm 05:03 PM

oracle 处理监听

Sharing the steps to modify the time format in Oracle

Title: Step sharing and specific code examples for modifying the time format in Oracle database. In Oracle database, the display of time format is crucial for data analysis and report output. The correct time format can make the data more intuitive and clear, and improve the efficiency of data processing. In practical applications, sometimes we need to modify the time field in the database to a specific format, which requires time format conversion. Next, this article will share the specific steps to modify the time format in the Oracle database, and provide code examples to

Mar 06, 2024 pm 04:18 PM

oracle 时间格式修改 sql语句

How to set read-only permissions on a table in Oracle database?

In the Oracle database, setting read-only permissions on tables is a very important operation, which can protect data security and prevent misoperations. The following will introduce how to set read-only permissions on tables in an Oracle database and provide specific code examples. First, we need to understand that in the Oracle database, users obtain permissions on tables through authorization. Table permissions include SELECT (query), INSERT (insert), UPDATE (update) and DELETE (delete) operations. Here we will introduce

Mar 06, 2024 pm 03:03 PM

oracle 表只读

How does Oracle modify the time format?

Modification of the time format in Oracle database is very common in actual development. This article will introduce how to modify the time format in Oracle database and provide specific code examples. In Oracle database, there are two main time data types: DATE and TIMESTAMP. The DATE type stores date and time, while the TIMESTAMP type can store higher-precision time information. When modifying the time format, you can use the TO_CHAR function. Next we

Mar 06, 2024 pm 03:00 PM

oracle 时间格式修改

Tips for modifying Oracle time display mode

"Techniques for modifying Oracle time display mode, specific code examples are required" In Oracle database, time display is one of the common operational requirements. By default, the display format of time in Oracle database is fixed, but sometimes we need to format the display according to our own needs. This article will introduce how to modify the time display mode in Oracle database and provide specific code examples. Modification time display format In Oracle database, the data type of the time field is usually DAT

Mar 06, 2024 pm 12:51 PM

时间显示调整 sql语句

How to use Oracle to query whether a table is locked?

Title: How to use Oracle to query whether a table is locked? In Oracle database, table lock means that when a transaction is performing a write operation on the table, other transactions will be blocked when they want to perform write operations on the table or make structural changes to the table (such as adding columns, deleting rows, etc.). In the actual development process, we often need to query whether the table is locked in order to better troubleshoot and deal with related problems. This article will introduce how to use Oracle statements to query whether a table is locked, and give specific code examples. To check whether the table is locked, we

Mar 06, 2024 am 11:54 AM

查询 oracle 锁

Detailed explanation of Oracle time format modification method

Detailed explanation of Oracle time format modification method In Oracle database, time format plays a vital role in data query, data insertion and data display. Proper time formatting makes data clearer, easier to read, and aids in data analysis. This article will introduce in detail how to modify the time format in Oracle database and provide specific code examples. 1. Modify the format of the time field in the data table. In the Oracle database, you can use the ALTERTABLE statement to modify the format of the time field in the data table.

Mar 06, 2024 am 11:39 AM

详解修改方法

How to restrict user operations on tables to read-only in Oracle database?

In Oracle database, you can restrict user operations on tables to read-only by granting read-only permissions. The following will introduce in detail how to implement this function in Oracle database and provide specific code examples. Create a new read-only role: CREATEROLEreadonly_role; Set the role to read-only permissions: GRANTSELECTONTOreadonly_role; here

Mar 06, 2024 am 11:36 AM

权限控制表操作限制只读权限

What is the linux scheduled shutdown command?

In Linux, the scheduled shutdown command is the shutdown command. This command allows administrators to shut down the system at a specified time. Commonly used scheduled shutdown commands: 1. shutdown -h +60: indicates shutdown after 60 minutes; 2. shutdown -h 22:00: indicates shutdown at 10 pm; 3. shutdown -r +30: indicates shutdown after 30 minutes Restart the system; 4. shutdown -r 08:00: means restarting the system at 8 o'clock in the morning, etc.

Mar 04, 2024 pm 03:29 PM

linux 定时关机命令