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- What is the default port number of oracle database
- The default listening port number for Oracle Database is 1521, which is used to identify a specific application or service and receive connection requests. To change the default port number, you can use the Oracle Net Configuration Assistant or manually modify the configuration file.
- Oracle 735 2024-04-02 11:12:13
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- what does oracle mean
- Oracle is a database management system (DBMS) developed by Oracle Corporation primarily for managing and organizing large data sets. Oracle has the characteristics of high reliability, high performance, scalability, security, and customizability. It is widely used in fields such as ERP, CRM, business intelligence, data warehouse, and OLTP. It is an industry-leading DBMS with a rich ecosystem. and extensive support options, with ongoing innovation and feature updates.
- Oracle 932 2024-04-02 11:09:18
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- What are the Oracle index types?
- Oracle index types include: 1. B-Tree index; 2. Bitmap index; 3. Function index; 4. Hash index; 5. Reverse key index; 6. Local index; 7. Global index; 8. Domain index ; 9. Bitmap connection index; 10. Composite index. Detailed introduction: 1. B-Tree index is a self-balancing tree data structure that can efficiently support concurrent operations. In Oracle database, B-Tree index is the most commonly used index type; 2. Bit Graph index is an index type based on bitmap algorithm and so on.
- Oracle 2346 2023-11-16 09:59:19
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- Introduction to the usage of RAC in Oracle
- The usage of RAC in Oracle: 1. Provide high availability by running database instances on multiple servers; 2. Allow the number of nodes to be increased or reduced when needed; 3. Achieve load balancing by distributing the workload to multiple nodes; 4. Use shared storage to achieve data sharing between multiple nodes; 5. Allow multiple nodes to process database requests at the same time, thereby achieving parallel processing; 6. Provide a transparent failover function; 7. Use some technologies to ensure that data Consistency; 8. Provides management tools to simplify the management and maintenance of the RAC environment.
- Oracle 1242 2023-09-19 11:26:15
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- How to view the operation history of an Oracle database
- Methods to view operation history: 1. Use Oracle's built-in audit function to record various operations that occur in the database, including logins, DDL statements, DML statements, etc.; 2. Use Oracle log files, which contain operations that occur in the database. For various operations, you can obtain the operation history by viewing log files; 3. Use Oracle's Flashback function to view the operation history of the database at a certain point in time; 4. Use third-party tools, etc.
- Oracle 8420 2023-09-19 11:13:37
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- How to implement paging in oracle
- Steps to implement paging: 1. Use ROWNUM for paging query; 2. Set paging parameters before executing the query; 3. Use the "COUNT(*)" function to obtain the total number of rows, and use the "CEIL" function to round up the calculation. Total number of pages; 4. Use the "WHERE" clause in the external query to filter out a specific row number range to implement paging query.
- Oracle 3439 2023-09-18 13:16:57
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- What is the usage of Oracle's decode function?
- The usage of Oracle's decode function is: 1. Basic usage, simple conditional judgment based on a conditional field; 2. Multi-conditional judgment, returning different results based on multiple conditions; 3. Nested DECODE function, nesting the DECODE function Use it to achieve more complex conditional judgment and result return; 4. Use it in combination with other SQL statements: Use the DECODE function in combination with other SQL statements (such as WHERE clause) to achieve more flexible data query and processing, etc.
- Oracle 14392 2023-09-07 14:08:05
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- What are the usages of case when in Oracle?
- The usage of case when in Oracle is: 1. Used in WHERE clause, CASE WHEN can be used to implement more complex filtering conditions, can be used to nest other conditional expressions, and use logical operators (AND, OR, NOT) to combine conditions; 2. Used in the SELECT column list, CASE WHEN can be used to add additional columns to the query results. Different values can be returned based on the results of a condition and displayed as new columns in the result set.
- Oracle 12139 2023-09-07 14:01:05
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- What is the difference between oracle stored procedures and functions
- The differences between Oracle stored procedures and functions include functional differences, calling methods, return values, transaction processing, and usage scenarios. Detailed introduction: 1. Functional differences. A stored procedure is a set of SQL statements and logical operations. It is used to perform specific tasks or operations. Stored procedures can contain control structures, can accept parameters, and can return results. Stored procedures usually Used to perform complex business logic, such as data processing and transaction management, a function is a piece of executable code that accepts input parameters and returns a value, etc.
- Oracle 1514 2023-08-28 13:57:44
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- How oracle marks peak values
- Oracle's method of marking peak values: 1. Monitoring tools can help administrators monitor the performance indicators of the database in real time and generate detailed reports; 2. Performance monitors can monitor all aspects of the database by setting appropriate monitor items and thresholds. , can capture the peak load and resource usage of the database; 3. SQL tracking, by turning on SQL tracking, can capture the SQL statements and related performance indicators executed by the database during peak load; 4. Load testing, which can simulate simultaneous access by multiple users database, and record the performance indicators of the database, etc.
- Oracle 1580 2023-08-25 14:40:24
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- How to modify the name of a table in oracle
- Steps for Oracle to modify the name of a table: 1. Open the Oracle database management system and connect to the target database; 2. Ensure that you have sufficient permissions to modify the name of the table; 3. Use the "ALTER TABLE current_table_name RENAME TO new_table_name" syntax to modify the table name; 4. Execute the command and Oracle will modify the name of the table; 5. You can use the SELECT statement to verify whether the name of the table has been modified successfully.
- Oracle 3263 2023-08-25 14:35:27
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- What does the oracle password mean?
- The oracle password refers to the user password used to access the Oracle database. Each user has a unique username and corresponding password, which are used to verify the user's identity and authorize the user to operate the database. Oracle password settings usually need to meet certain complexity requirements to ensure password security. These requirements may include password length, combination of uppercase and lowercase letters, numbers, and special characters, etc. By setting complex passwords, you can reduce the risk of being cracked and improve database security.
- Oracle 1553 2023-08-24 14:29:50
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- How to write addition, subtraction, multiplication and division in oracle
- How to write addition, subtraction, multiplication and division in Oracle: 1. For addition operations, you can use the plus sign "+" to implement the code "Column Name 1 + Column Name 2 AS sum"; 2. For subtraction operations, you can use the minus sign "-" to implement the code. "Column name 1 - column name 2 AS difference"; 3. For multiplication operation, you can use the multiplication sign "*", the code is "column name 1*column name 2 AS product"; 4. For division operation, you can use the division sign " /" to achieve, the code "column name 1/column name 2 AS quotient".
- Oracle 3154 2023-08-24 14:25:14
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- How to convert string to date in oracle
- You can use the "TO_DATE" function to convert Oracle strings to dates. Use the syntax "TO_DATE(char, format)" of the TO_DATE function to complete the conversion, where char represents the string to be converted to a date, and format represents the date format of the string. It should be noted that if the string does not match the specified date format, the TO_DATE function will throw an error. Therefore, make sure to specify the correct date format when using the TO_DATE function for date conversion.
- Oracle 9209 2023-08-22 14:48:44
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- How to clear table data in oracle
- How to clear table data in Oracle: 1. Use the TRUNCATE TABLE statement to delete all rows in the table, but retain the table structure, indexes, constraints, etc.; 2. Use the DELETE statement to delete rows in the table, and you can Conditionally select rows to be deleted; 3. Use the DROP TABLE statement to delete the entire table, including table structure, indexes, constraints, etc.
- Oracle 8222 2023-08-16 11:52:04
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