深入分析关于Oracle数据库的备份策略
备份脚本应该对Log重定向并保存.以便在出错的查找有用信息. 与RMAN备份有关的优化 备份操作主要是完成以下三个步骤
备份脚本应该对Log重定向并保存.以便在出错的查找有用信息.
与RMAN备份有关的优化
备份操作主要是完成以下三个步骤
1、从磁盘上读取数据
2、在内存中处理数据块
3、写入数据到磁盘或磁带
以上的读写操作可以同步或异步的完成，在同步I/O操作中，一个时间只允许有一个IO操作，但是在异步I/O操作中，一个时间允许有多个IO操作。因此，备份与恢复的调优主要集中在以下几个方面：
1、提高同步或异步I/O操作能力
在支持异步操作的操作系统上，可以通过设置TAPE_AYSNCH_IO,DISK_ASYNCH_IO和BACKUP_TYPE_IO_SLAVES来支持异步操作，提高写的能力。
2、提高磁盘读能力
可以在backup命令后通过设置DISKRATIO来保证从多个磁盘上读取数据，保证连续的数据流。
3、正确设置缓冲区与参数值
设置LARGE_POOL_SIZE，使备份可以使用连续的缓冲池，通过设置DB_FIL_DIRECT_IO_COUNT可以提高缓冲区的利用。如果使用磁带备份，还可以设置BACKUP_TYPE_IO_SLAVES来提高磁带的写能力。
4、采用并行备份
开辟多个通道，可以实现并行备份与恢复
.备份RMAN数据库
RMAN自己的数据库也需要备份，但是本身很小，，而且不是经常发生变化，所以在每次RMAN备份完成后，都可以用如下脚本对RMAN数据库备份。
EXP pafile =exprman.sql
exprman.sql为
USERID=RMAN/RMAN
BUFFER=32768
OWNER=RMAN
FILE=RMAN.DMP
ROWS=Y
GRANTS=Y
COMPRESS=Y
CONSISTENT=Y
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
How long will Oracle database logs be kept?
May 10, 2024 am 03:27 AM
The retention period of Oracle database logs depends on the log type and configuration, including: Redo logs: determined by the maximum size configured with the "LOG_ARCHIVE_DEST" parameter. Archived redo logs: Determined by the maximum size configured by the "DB_RECOVERY_FILE_DEST_SIZE" parameter. Online redo logs: not archived, lost when the database is restarted, and the retention period is consistent with the instance running time. Audit log: Configured by the "AUDIT_TRAIL" parameter, retained for 30 days by default.
The order of the oracle database startup steps is
May 10, 2024 am 01:48 AM
The Oracle database startup sequence is: 1. Check the preconditions; 2. Start the listener; 3. Start the database instance; 4. Wait for the database to open; 5. Connect to the database; 6. Verify the database status; 7. Enable the service (if necessary ); 8. Test the connection.
How much memory does oracle require?
May 10, 2024 am 04:12 AM
The amount of memory required by Oracle depends on database size, activity level, and required performance level: for storing data buffers, index buffers, executing SQL statements, and managing the data dictionary cache. The exact amount is affected by database size, activity level, and required performance level. Best practices include setting the appropriate SGA size, sizing SGA components, using AMM, and monitoring memory usage.
How to see the number of occurrences of a certain character in Oracle
May 09, 2024 pm 09:33 PM
To find the number of occurrences of a character in Oracle, perform the following steps: Get the total length of a string; Get the length of the substring in which a character occurs; Count the number of occurrences of a character by subtracting the substring length from the total length.
Oracle database server hardware configuration requirements
May 10, 2024 am 04:00 AM
Oracle database server hardware configuration requirements: Processor: multi-core, with a main frequency of at least 2.5 GHz. For large databases, 32 cores or more are recommended. Memory: At least 8GB for small databases, 16-64GB for medium sizes, up to 512GB or more for large databases or heavy workloads. Storage: SSD or NVMe disks, RAID arrays for redundancy and performance. Network: High-speed network (10GbE or higher), dedicated network card, low-latency network. Others: Stable power supply, redundant components, compatible operating system and software, heat dissipation and cooling system.
70B model generates 1,000 tokens in seconds, code rewriting surpasses GPT-4o, from the Cursor team, a code artifact invested by OpenAI
Jun 13, 2024 pm 03:47 PM
70B model, 1000 tokens can be generated in seconds, which translates into nearly 4000 characters! The researchers fine-tuned Llama3 and introduced an acceleration algorithm. Compared with the native version, the speed is 13 times faster! Not only is it fast, its performance on code rewriting tasks even surpasses GPT-4o. This achievement comes from anysphere, the team behind the popular AI programming artifact Cursor, and OpenAI also participated in the investment. You must know that on Groq, a well-known fast inference acceleration framework, the inference speed of 70BLlama3 is only more than 300 tokens per second. With the speed of Cursor, it can be said that it achieves near-instant complete code file editing. Some people call it a good guy, if you put Curs
AI startups collectively switched jobs to OpenAI, and the security team regrouped after Ilya left!
Jun 08, 2024 pm 01:00 PM
Last week, amid the internal wave of resignations and external criticism, OpenAI was plagued by internal and external troubles: - The infringement of the widow sister sparked global heated discussions - Employees signing "overlord clauses" were exposed one after another - Netizens listed Ultraman's "seven deadly sins" Rumors refuting: According to leaked information and documents obtained by Vox, OpenAI’s senior leadership, including Altman, was well aware of these equity recovery provisions and signed off on them. In addition, there is a serious and urgent issue facing OpenAI - AI safety. The recent departures of five security-related employees, including two of its most prominent employees, and the dissolution of the "Super Alignment" team have once again put OpenAI's security issues in the spotlight. Fortune magazine reported that OpenA
Oracle scheduled tasks execute the creation step once a day
May 10, 2024 am 03:03 AM
To create a scheduled task in Oracle that executes once a day, you need to perform the following three steps: Create a job. Add a subjob to the job and set its schedule expression to "INTERVAL 1 DAY". Enable the job.
