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How to automatically back up oracle databases

How to automatically back up oracle databases

To enable automatic backup in Oracle, follow these steps: 1. Create a backup plan; 2. Enable a backup plan; 3. Schedule the backup window. Automatic backups automatically connect to the database, identify changes, create incremental backups, store backups and clean old backups, thereby reducing management burdens, improving data protection, providing version control, optimizing performance and supporting compliance.

Apr 11, 2025 pm 08:12 PM
oracle 数据丢失
How to get time in oracle

How to get time in oracle

There are the following methods to get time in Oracle: CURRENT_TIMESTAMP: Returns the current system time, accurate to seconds. SYSTIMESTAMP: More accurate than CURRENT_TIMESTAMP, to nanoseconds. SYSDATE: Returns the current system date, excluding the time part. TO_CHAR(SYSDATE, 'YYY-MM-DD HH24:MI:SS'): Converts the current system date and time to a specific format. EXTRACT: Extracts a specific part from a time value, such as a year, month, or hour.

Apr 11, 2025 pm 08:09 PM
oracle
How to import oracle database

How to import oracle database

Data import method: 1. Use the SQLLoader utility: prepare data files, create control files, and run SQLLoader; 2. Use the IMP/EXP tool: export data, import data. Tip: 1. Recommended SQL*Loader for big data sets; 2. The target table should exist and the column definition matches; 3. After importing, data integrity needs to be verified.

Apr 11, 2025 pm 08:06 PM
oracle
How to switch users from oracle

How to switch users from oracle

There are two ways to switch Oracle database users: ALTER SESSION: Use the ALTER SESSION syntax, for example: ALTER SESSION SET CURRENT_USER = 'hr'; CONNECT: Disconnect the current session and reconnect using the CONNECT syntax, for example: CONNECT hr/hr_password AS SYSDBA.

Apr 11, 2025 pm 08:03 PM
oracle
How to create a table in oracle

How to create a table in oracle

Creating an Oracle table involves the following steps: Use the CREATE TABLE syntax to specify table names, column names, data types, constraints, and default values. The table name should be concise and descriptive, and should not exceed 30 characters. The column name should be descriptive, and the data type specifies the data type stored in the column. The NOT NULL constraint ensures that null values ​​are not allowed in the column, and the DEFAULT clause specifies the default values ​​for the column. PRIMARY KEY Constraints to identify the unique record of the table. FOREIGN KEY constraint specifies that the column in the table refers to the primary key in another table. See the creation of the sample table students, which contains primary keys, unique constraints, and default values.

Apr 11, 2025 pm 08:00 PM
oracle
How to add conditions for oracle deduplication

How to add conditions for oracle deduplication

Oracle's methods to remove duplicate records are: DISTINCT: Remove all duplicate rows with the same column value. GROUP BY: Group rows of the same value and return only one representative row. ROW_NUMBER(): Assign a unique integer to each row to identify and delete duplicate rows. You can also add conditions to remove only duplicate rows that meet certain conditions, such as the salary value greater than 5000.

Apr 11, 2025 pm 07:57 PM
oracle
How to set the oracle time format

How to set the oracle time format

The time format in Oracle databases can be set through session-level or system-level settings. Session-level settings have higher priority than system-level settings. Oracle supports a variety of time formats, such as "YYYY-MM-DD HH24:MI:SS" and "DD-MON-YY HH:MI:SS AM/PM". Session-level settings can be performed by the ALTER SESSION command or the PL/SQL TO_CHAR function; system-level settings can be performed by setting the NLS_DATE_FORMAT parameter in the init.ora or spfile.ora file.

Apr 11, 2025 pm 07:54 PM
oracle
How to use oracle after installation

How to use oracle after installation

After Oracle is installed, you can use the following steps: Create a database instance. Connect to the database. Create a user. Create a table. Insert data. Query data. Export data. Import data.

Apr 11, 2025 pm 07:51 PM
oracle linux
How to backup and restore oracle database

How to backup and restore oracle database

Oracle database backup can be implemented through RMAN backup, export/import utility, and logical backup (Flashback). Restore principles vary according to the backup type, including: RMAN backup and restore, export/import export and restore, logical backup (Flashback) restore. The specific restore process involves starting the RMAN connection database, restoring the backup set using the RESTORE/RECOVER command, exporting/importing files, rebuilding and permissions, and using the Flashback command to restore to a specific point in time.

Apr 11, 2025 pm 07:48 PM
oracle
How to solve the oracle lock table

How to solve the oracle lock table

Oracle lock tables can be solved by viewing lock information and finding locked objects and sessions. Use the KILL command to terminate the idle locked session. Restart the database instance and release all locks. Use the ALTER SYSTEM KILL SESSION command to terminate a stubborn locked session. Use the DBMS_LOCK package for programmatic lock management. Optimize query to reduce lock frequency. Set lock compatibility level to reduce lock contention. Use concurrency control mechanisms to reduce locking requirements. Enable automatic deadlock detection, and the system will automatically roll back the deadlock session.

Apr 11, 2025 pm 07:45 PM
oracle 并发访问 数据丢失
How to create a tablespace in oracle

How to create a tablespace in oracle

Creating a tablespace in Oracle requires the following steps: Connect to the database; specify the tablespace name, data file location, and size using the CREATE TABLESPACE statement; set default storage properties, including initial size, next size, and minimum extension; enable or disable logging; set tablespace status (online or offline); submit changes; verify that the tablespace is created successfully.

Apr 11, 2025 pm 07:42 PM
oracle
How to view oracle running status

How to view oracle running status

View Oracle running status by using SQLPlus: Query the V$INSTANCE table; through the Overview tab of Oracle Enterprise Manager; through the Monitoring dashboard of Oracle Cloud Control; through the Summary section of Oracle Grid Control.

Apr 11, 2025 pm 07:39 PM
oracle
How to use oracle sequence

How to use oracle sequence

Oracle sequences are used to generate unique sequences of numbers, usually used as primary keys or identifiers. Creating a sequence requires specifying the sequence name, starting value, incremental value, maximum value, minimum value, cache size, and loop flags. When using a sequence, use the NEXTVAL keyword to get the next value of the sequence.

Apr 11, 2025 pm 07:36 PM
oracle
How to re-query oracle

How to re-query oracle

Oracle provides multiple deduplication query methods: The DISTINCT keyword returns a unique value for each column. The GROUP BY clause groups the results and returns a non-repetitive value for each group. The UNIQUE keyword is used to create an index containing only unique rows, and querying the index will automatically deduplicate. The ROW_NUMBER() function assigns unique numbers and filters out results that contain only line 1. The MIN() or MAX() function returns non-repetitive values ​​of a numeric column. The INTERSECT operator returns the common values ​​of the two result sets (no duplicates).

Apr 11, 2025 pm 07:33 PM
oracle

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