欢迎进入Oracle社区论坛,与200万技术人员互动交流 >>进入 主要介绍了Oracle数据库管理员在工作环境下的具体职责,详细内容请参考下文: Oracle数据库管理员应按如下方式对Oracle数据库系统做定期监控: (1). 每天对Oracle数据库的运行状态 , 日志文件 , 备
欢迎进入Oracle社区论坛,与200万技术人员互动交流 >>进入
主要介绍了Oracle数据库管理员在工作环境下的具体职责,详细内容请参考下文:
Oracle数据库管理员应按如下方式对Oracle数据库系统做定期监控:
(1). 每天对Oracle数据库的运行状态 , 日志文件 , 备份情况 , 数据库的空间使用情况 , 系统资源的使用情况进行检查 , 发现并解决问题。
(2). 每周对数据库对象的空间扩展情况 , 数据的增长情况进行监控 , 对数据库做健康检查 , 对数据库对象的状态做检查。
(3). 每月对表和索引等进行 Analyze, 检查表空间碎片 , 寻找数据库性能调整的机会 , 进行数据库性能调整 , 提出下一步空间管理计划。对Oracle数据库状态进行一次全面检查。
每天的工作
(1). 确认所有的 INSTANCE 状态正常
登陆到所有数据库或例程 , 检测 ORACLE 后台进程 :
$ps ?ef|grep ora
(2). 检查文件系统的使用(剩余空间)。如果文件系统的剩余空间小于 20% ,需删除不用的文件以释放空间。
$df ?k
(3). 检查日志文件和 trace 文件记录 alert 和 trace 文件中的错误。
连接到每个需管理的系统
使用' telnet '
对每个数据库 ,cd 到 bdump 目录 , 通常是 $ORACLE_BASE//bdump
使用 Unix ‘tail' 命令来查看 alert_.log 文件
如果发现任何新的 ORA- 错误 , 记录并解决
(4). 检查数据库当日备份的有效性。
对 RMAN 备份方式 :
检查第三方备份工具的备份日志以确定备份是否成功
对 EXPORT 备份方式 :
检查 exp 日志文件以确定备份是否成功
对其他备份方式 :
检查相应的日志文件
(5). 检查数据文件的状态记录状态不是“ online” 的数据文件,并做恢复。
Select file_name from dba_data_files where status='OFFLINE'
(6). 检查表空间的使用情况
SELECT tablespace_name, max_m, count_blocks free_blk_cnt, sum_free_m,to_char(100*sum_free_m/sum_m, '99.99') || '%' AS pct_free
FROM ( SELECT tablespace_name,sum(bytes)/1024/1024 AS sum_m FROM dba_data_files GROUP BY tablespace_name),
( SELECT tablespace_name AS fs_ts_name, max(bytes)/1024/1024 AS max_m, count(blocks) AS count_blocks, sum(bytes/1024/1024) AS sum_free_m FROM dba_free_space GROUP BY tablespace_name )
WHERE tablespace_name = fs_ts_name
(7). 检查剩余表空间
SELECT tablespace_name, sum ( blocks ) as free_blk ,
trunc ( sum ( bytes ) /(1024*1024) ) as free_m,
max ( bytes ) / (1024) as big_chunk_k, count (*) as num_chunks
FROM dba_free_space GROUP BY tablespace_name;
(8). 监控数据库性能
运行 bstat/estat 生成系统报告
或者使用 statspack 收集统计数据
(9). 检查数据库性能,记录数据库的 cpu 使用、 IO 、 buffer 命中率等等
使用 vmstat,iostat,glance,top 等命令
(10). 日常出现问题的处理。
每周的工作
(1). 控数据库对象的空间扩展情况
根据本周每天的检查情况找到空间扩展很快的数据库对象 , 并采取相应的措施
-- 删除历史数据
--- 扩表空间
alter tablespace add datafile ‘' size
--- 调整数据对象的存储参数
next extent
pct_increase
(2). 监控数据量的增长情况
根据本周每天的检查情况找到记录数量增长很快的数据库对象 , 并采取相应的措施
-- 删除历史数据
--- 扩表空间
alter tablespace add datafile ‘' size
(3). 系统健康检查
检查以下内容 :
init.ora
controlfile
redo log file
archiving
sort area size
tablespace(system,temporary,tablespace fragment)
datafiles(autoextend,location)
object(number of extent,next extent,index)
rollback segment
logging &tracing(alert.log,max_dump_file_size,sqlnet)
(4). 检查无效的数据库对象
SELECT owner, object_name, object_type FROM dba_objects
WHERE status= ' INVALID '。
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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.

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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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