启动数据库时: SYS@orcl11gstartupORACLE instance started.Total System Global Area 417546240 bytesFixed Size 2213936 bytesVariable Size 327157712 bytesDatabase Buffers 83886080 bytesRedo Buffers 4288512 bytesDatabase mounted.ORA-03113: end-o
启动数据库时:SYS@orcl11g>startup ORACLE instance started. Total System Global Area 417546240 bytes Fixed Size 2213936 bytes Variable Size 327157712 bytes Database Buffers 83886080 bytes Redo Buffers 4288512 bytes Database mounted. ORA-03113: end-of-file on communication channel Process ID: 1935 Session ID: 1 Serial number: 5
利用10046 事件跟踪数据库打开过程:
SYS@orcl11g>startup mount ORACLE instance started. Total System Global Area 417546240 bytes Fixed Size 2213936 bytes Variable Size 327157712 bytes Database Buffers 83886080 bytes Redo Buffers 4288512 bytes Database mounted. SYS@orcl11g>oradebug setmypid Statement processed. SYS@orcl11g> SYS@orcl11g> SYS@orcl11g>oradebug event 10046 trace name context forever,level 12; Statement processed. SYS@orcl11g> SYS@orcl11g> SYS@orcl11g>oradebug tracefile_name /opt/oracle/diag/rdbms/orcl11g/orcl11g/trace/orcl11g_ora_1727.trc SYS@orcl11g>alter database open; alter database open * ERROR at line 1: ORA-03113: end-of-file on communication channel Process ID: 1727 Session ID: 1 Serial number: 5查看trace文件:
ORA-19815: WARNING: db_recovery_file_dest_size of 4070572032 bytes is 100.00% used, and has 0 remaining bytes available. ************************************************************************ You have following choices to free up space from recovery area: 1. Consider changing RMAN RETENTION POLICY. If you are using Data Guard, then consider changing RMAN ARCHIVELOG DELETION POLICY. 2. Back up files to tertiary device such as tape using RMAN BACKUP RECOVERY AREA command. 3. Add disk space and increase db_recovery_file_dest_size parameter to reflect the new space. 4. Delete unnecessary files using RMAN DELETE command. If an operating system command was used to delete files, then use RMAN CROSSCHECK and DELETE EXPIRED commands. ************************************************************************ ORA-19809: limit exceeded for recovery files ORA-19804: cannot reclaim 43927552 bytes disk space from 4070572032 limit *** 2014-11-15 21:20:56.648 4132 krsh.c ARCH: Error 19809 Creating archive log file to '/opt/oracle/flash_recovery_area/ORCL11G/archivelog/2014_11_15/o1_mf_1_52_%u_.arc' *** 2014-11-15 21:20:56.648 2747 krsi.c krsi_dst_fail: dest:1 err:19809 force:0 blast:1 WAIT #1: nam='log file sequential read' ela= 5 log#=0 block#=0 blocks=0 obj#=-1 tim=1416104456648722 WAIT #1: nam='Disk file operations I/O' ela= 15 FileOperation=5 fileno=0 filetype=3 obj#=-1 tim=1416104456648774 WAIT #1: nam='control file sequential read' ela= 14 file#=0 block#=1 blocks=1 obj#=-1 tim=1416104456648863 WAIT #1: nam='control file sequential read' ela= 11 file#=0 block#=15 blocks=1 obj#=-1 tim=1416104456648969 WAIT #1: nam='control file sequential read' ela= 10 file#=0 block#=17 blocks=1 obj#=-1 tim=1416104456649013 WAIT #1: nam='control file sequential read' ela= 10 file#=0 block#=22 blocks=1 obj#=-1 tim=1416104456649075 WAIT #1: nam='control file parallel write' ela= 4671 files=1 block#=21 requests=1 obj#=-1 tim=1416104456653795 WAIT #1: nam='control file parallel write' ela= 956 files=1 block#=18 requests=1 obj#=-1 tim=1416104456654862 WAIT #1: nam='control file parallel write' ela= 1817 files=1 block#=16 requests=1 obj#=-1 tim=1416104456656679 WAIT #1: nam='control file parallel write' ela= 1295 files=1 block#=1 requests=1 obj#=-1 tim=1416104456658021 WAIT #1: nam='control file sequential read' ela= 14 file#=0 block#=1 blocks=1 obj#=-1 tim=1416104456658082 WAIT #1: nam='control file sequential read' ela= 12 file#=0 block#=32 blocks=1 obj#=-1 tim=1416104456658162 DDE: Problem Key 'ORA 312' was flood controlled (0x1) (no incident) ORA-00312: online log 1 thread 1: '/opt/oracle/oradata/orcl11g/redo01.log' ORA-16038: log 1 sequence# 52 cannot be archived ORA-19809: limit exceeded for recovery files ORA-00312: online log 1 thread 1: '/opt/oracle/oradata/orcl11g/redo01.log' www.zbdba.com *** 2014-11-15 21:20:56.660 USER (ospid: 2247): terminating the instance due to error 16038原来是flash_recovery_area满了,无法进行归档。增加db_recovery_file_dest_size:
SYS@orcl11g>alter system set db_recovery_file_dest_size=8G scope=spfile; System altered. SYS@orcl11g>startup ORACLE instance started. Total System Global Area 417546240 bytes Fixed Size 2213936 bytes Variable Size 327157712 bytes Database Buffers 83886080 bytes Redo Buffers 4288512 bytes Database mounted. Database opened. SYS@orcl11g>show parameter recover NAME TYPE VALUE ------------------------------------ ---------------------- ------------------------------ db_recovery_file_dest string /opt/oracle/flash_recovery_are a db_recovery_file_dest_size big integer 8G recovery_parallelism integer 0
至此已经打开数据库,所以数据库启动失败,我们利用10046事件跟踪就能发现具体的原因。

InnoDBBufferPool通過緩存數據和索引頁來減少磁盤I/O,提升數據庫性能。其工作原理包括:1.數據讀取:從BufferPool中讀取數據;2.數據寫入:修改數據後寫入BufferPool並定期刷新到磁盤;3.緩存管理:使用LRU算法管理緩存頁;4.預讀機制:提前加載相鄰數據頁。通過調整BufferPool大小和使用多個實例,可以優化數據庫性能。

MySQL与其他编程语言相比,主要用于存储和管理数据,而其他语言如Python、Java、C 则用于逻辑处理和应用开发。MySQL以其高性能、可扩展性和跨平台支持著称,适合数据管理需求,而其他语言在各自领域如数据分析、企业应用和系统编程中各有优势。

MySQL值得學習,因為它是強大的開源數據庫管理系統,適用於數據存儲、管理和分析。 1)MySQL是關係型數據庫,使用SQL操作數據,適合結構化數據管理。 2)SQL語言是與MySQL交互的關鍵,支持CRUD操作。 3)MySQL的工作原理包括客戶端/服務器架構、存儲引擎和查詢優化器。 4)基本用法包括創建數據庫和表,高級用法涉及使用JOIN連接表。 5)常見錯誤包括語法錯誤和權限問題,調試技巧包括檢查語法和使用EXPLAIN命令。 6)性能優化涉及使用索引、優化SQL語句和定期維護數據庫。

MySQL適合初學者學習數據庫技能。 1.安裝MySQL服務器和客戶端工具。 2.理解基本SQL查詢,如SELECT。 3.掌握數據操作:創建表、插入、更新、刪除數據。 4.學習高級技巧:子查詢和窗口函數。 5.調試和優化:檢查語法、使用索引、避免SELECT*,並使用LIMIT。

MySQL通過表結構和SQL查詢高效管理結構化數據,並通過外鍵實現表間關係。 1.創建表時定義數據格式和類型。 2.使用外鍵建立表間關係。 3.通過索引和查詢優化提高性能。 4.定期備份和監控數據庫確保數據安全和性能優化。

MySQL是一個開源的關係型數據庫管理系統,廣泛應用於Web開發。它的關鍵特性包括:1.支持多種存儲引擎,如InnoDB和MyISAM,適用於不同場景;2.提供主從復制功能,利於負載均衡和數據備份;3.通過查詢優化和索引使用提高查詢效率。

SQL用於與MySQL數據庫交互,實現數據的增、刪、改、查及數據庫設計。 1)SQL通過SELECT、INSERT、UPDATE、DELETE語句進行數據操作;2)使用CREATE、ALTER、DROP語句進行數據庫設計和管理;3)複雜查詢和數據分析通過SQL實現,提升業務決策效率。

MySQL的基本操作包括創建數據庫、表格,及使用SQL進行數據的CRUD操作。 1.創建數據庫:CREATEDATABASEmy_first_db;2.創建表格:CREATETABLEbooks(idINTAUTO_INCREMENTPRIMARYKEY,titleVARCHAR(100)NOTNULL,authorVARCHAR(100)NOTNULL,published_yearINT);3.插入數據:INSERTINTObooks(title,author,published_year)VA


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