本文为原创,转载请注明出处。 说明: /u02/ggs/dirdat/sb为源头抽取进程形成的trail文件名 /u02/ggs/dirdat/tb为源头传输进程往目的端传输,在目的端形成的trail文件名。 2014-08-01 13:51:11 INFO OGG-01026 Rolling over remote file /u02/ggs/dirdat/tb0
本文为原创,转载请注明出处。
说明:
/u02/ggs/dirdat/sb为源头抽取进程形成的trail文件名
/u02/ggs/dirdat/tb为源头传输进程往目的端传输,在目的端形成的trail文件名。
2014-08-01 13:51:11 INFO OGG-01026 Rolling over remote file /u02/ggs/dirdat/tb001540.--->这个Rolling over 就是传输进程正在向目的端传输trail文件,在目的端形成的trail文件名为tb001540(当然,熟悉OGG的人都知道,在目的端上还有server进程,负责在目的端写入源头传输进程传输过来的trail文件。这里不描述server进程) Switching to next trail file /u02/ggs/dirdat/sb005614 at 2014-08-01 13:58:01 due to EOF, with current RBA 49999629 Opened trail file /u02/ggs/dirdat/sb005614 at 2014-08-01 13:58:01 Switching to next trail file /u02/ggs/dirdat/sb005615 at 2014-08-01 14:04:37 due to EOF, with current RBA 49999885 Opened trail file /u02/ggs/dirdat/sb005615 at 2014-08-01 14:04:37 Switching to next trail file /u02/ggs/dirdat/sb005616 at 2014-08-01 14:11:10 due to EOF, with current RBA 49999729 Opened trail file /u02/ggs/dirdat/sb005616 at 2014-08-01 14:11:10 Switching to next trail file /u02/ggs/dirdat/sb005617 at 2014-08-01 14:18:09 due to EOF, with current RBA 49999971 Opened trail file /u02/ggs/dirdat/sb005617 at 2014-08-01 14:18:09 --->以上四组Switching to next trail file 就是传输进程在检索源头trail文件(sb005614到sb005617)。也许有人会问,还要检索干啥,其实,OGG灵活就灵活在这里,用一句话来概括:抽取的table未必都传输,传输的table未必都应用。
2014-08-01 14:24:46 INFO OGG-01026 Rolling over remote file /u02/ggs/dirdat/tb001541. Switching to next trail file /u02/ggs/dirdat/sb005618 at 2014-08-01 14:25:42 due to EOF, with current RBA 49999853 Opened trail file /u02/ggs/dirdat/sb005618 at 2014-08-01 14:25:42

InnoDBBufferPool reduces disk I/O by caching data and indexing pages, improving database performance. Its working principle includes: 1. Data reading: Read data from BufferPool; 2. Data writing: After modifying the data, write to BufferPool and refresh it to disk regularly; 3. Cache management: Use the LRU algorithm to manage cache pages; 4. Reading mechanism: Load adjacent data pages in advance. By sizing the BufferPool and using multiple instances, database performance can be optimized.

Compared with other programming languages, MySQL is mainly used to store and manage data, while other languages such as Python, Java, and C are used for logical processing and application development. MySQL is known for its high performance, scalability and cross-platform support, suitable for data management needs, while other languages have advantages in their respective fields such as data analytics, enterprise applications, and system programming.

MySQL is worth learning because it is a powerful open source database management system suitable for data storage, management and analysis. 1) MySQL is a relational database that uses SQL to operate data and is suitable for structured data management. 2) The SQL language is the key to interacting with MySQL and supports CRUD operations. 3) The working principle of MySQL includes client/server architecture, storage engine and query optimizer. 4) Basic usage includes creating databases and tables, and advanced usage involves joining tables using JOIN. 5) Common errors include syntax errors and permission issues, and debugging skills include checking syntax and using EXPLAIN commands. 6) Performance optimization involves the use of indexes, optimization of SQL statements and regular maintenance of databases.

MySQL is suitable for beginners to learn database skills. 1. Install MySQL server and client tools. 2. Understand basic SQL queries, such as SELECT. 3. Master data operations: create tables, insert, update, and delete data. 4. Learn advanced skills: subquery and window functions. 5. Debugging and optimization: Check syntax, use indexes, avoid SELECT*, and use LIMIT.

MySQL efficiently manages structured data through table structure and SQL query, and implements inter-table relationships through foreign keys. 1. Define the data format and type when creating a table. 2. Use foreign keys to establish relationships between tables. 3. Improve performance through indexing and query optimization. 4. Regularly backup and monitor databases to ensure data security and performance optimization.

MySQL is an open source relational database management system that is widely used in Web development. Its key features include: 1. Supports multiple storage engines, such as InnoDB and MyISAM, suitable for different scenarios; 2. Provides master-slave replication functions to facilitate load balancing and data backup; 3. Improve query efficiency through query optimization and index use.

SQL is used to interact with MySQL database to realize data addition, deletion, modification, inspection and database design. 1) SQL performs data operations through SELECT, INSERT, UPDATE, DELETE statements; 2) Use CREATE, ALTER, DROP statements for database design and management; 3) Complex queries and data analysis are implemented through SQL to improve business decision-making efficiency.

The basic operations of MySQL include creating databases, tables, and using SQL to perform CRUD operations on data. 1. Create a database: CREATEDATABASEmy_first_db; 2. Create a table: CREATETABLEbooks(idINTAUTO_INCREMENTPRIMARYKEY, titleVARCHAR(100)NOTNULL, authorVARCHAR(100)NOTNULL, published_yearINT); 3. Insert data: INSERTINTObooks(title, author, published_year)VA


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