开发人员让我把一个oracle 11g的sga设置的稍微大一点。于是按照之前对oracle 10g的记忆操作。
开发人员让我把一个Oracle 11g的sga设置的稍微大一点。于是按照之前对oracle 10g的记忆操作。
[oracle@localhost db_1]$ sqlplus /nolog
SQL*Plus: Release 11.2.0.1.0 Production on 星期六 6月 30 13:42:07 2012
Copyright (c) 1982, 2009, Oracle. All rights reserved.
SQL> conn /as sysdba
已连接。
SQL> show parameter sga;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
lock_sga boolean FALSE
pre_page_sga boolean FALSE
sga_max_size big integer 4800M
sga_target big integer 0
SQL> create pfile='/tmp/pfile.ora' from spfile;
文件已创建。
SQL> host
[oracle@localhost db_1]$ cd /tmp
[oracle@localhost tmp]$ ls
mapping-root pfile.ora scim-panel-socket:0-root
[oracle@localhost tmp]$ mor pfile.ora
bash: mor: command not found
[oracle@localhost tmp]$ more pfile.ora
intopay.__db_cache_size=1610612736
intopay.__java_pool_size=67108864
intopay.__large_pool_size=67108864
intopay.__oracle_base='/u01'#ORACLE_BASE set from environment
intopay.__pga_aggregate_target=2013265920
intopay.__sga_target=3019898880
intopay.__shared_io_pool_size=0
intopay.__shared_pool_size=1207959552
intopay.__streams_pool_size=0
*.audit_file_dest='/u01/admin/intopay/adump'
*.audit_trail='db'
*.compatible='11.2.0.0.0'
*.control_files='/u01/oradata/intopay/control01.ctl','/u01/flash_recovery_area/intopay/control02.ctl'
*.db_block_size=8192
*.db_domain=''
*.db_name='intopay'
*.db_recovery_file_dest='/u01/flash_recovery_area'
*.db_recovery_file_dest_size=10737418240
*.diagnostic_dest='/u01'
*.dispatchers='(PROTOCOL=TCP) (SERVICE=intopayXDB)'
*.memory_target=5033164800
*.nls_language='SIMPLIFIED CHINESE'
*.nls_territory='CHINA'
*.open_cursors=300
*.processes=1500
*.remote_login_passwordfile='EXCLUSIVE'
*.sessions=1655
*.undo_tablespace='UNDOTBS1'
[oracle@localhost tmp]$ exit
exit
SQL> shutdown immediate
数据库已经关闭。
已经卸载数据库。
ORACLE 例程已经关闭。
SQL> startup mount
ORACLE 例程已经启动。
Total System Global Area 5010685952 bytes
Fixed Size 2212936 bytes
Variable Size 3355446200 bytes
Database Buffers 1610612736 bytes
Redo Buffers 42414080 bytes
数据库装载完毕。
SQL> ALTER SYSTEM SET sga_max_size = 6442450944 COMMENT=’internally adjusted’ SCOPE=SPFILE SID=’INTOPAY′;
ALTER SYSTEM SET sga_max_size = 6442450944 COMMENT=’internally adjusted’ SCOPE=SPFILE SID=’INTOPAY′
*
第 1 行出现错误:
ORA-01756: 引号内的字符串没有正确结束
SQL> ALTER SYSTEM SET sga_max_size = 6442450944 COMMENT='internally adjusted’ SCOPE=SPFILE SID='INTOPAY′;
ALTER SYSTEM SET sga_max_size = 6442450944 COMMENT='internally adjusted’ SCOPE=SPFILE SID='INTOPAY′
*
第 1 行出现错误:
ORA-02095: 无法修改指定的初始化参数
SQL> alter system set sga_max_size=6442450944 scope=spfile ;
系统已更改。
SQL> show parameter sga;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
lock_sga boolean FALSE
pre_page_sga boolean FALSE
sga_max_size big integer 4800M
sga_target big integer 0
SQL> ALTER SYSTEM SET sga_target = 6442450944 SCOPE=SPFILE;
系统已更改。

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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