Author: mac
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MMON Slave日志[KDL_TRIM]: NEWLEN: MESSAGES
有网友反映windows 2003 上的10.2.0.4数据库,MMON的Slave后台进程报带有NEWLEN: MESSAGES的相关日志,如: *** ACTION NAME:(Auto ADDM Slave Action) 2011-09-09 18:00:12.053 *** MODULE NAME:(MMON_SLAVE) 2011-09-09 18:00:12.053 *** SERVICE NAME:(SYS$BACKGROUND) 2011-09-09 18:00:12.053 *** SESSION ID:(797.606) 2011-09-09 18:00:12.053 [kdl_trim]: newlen: 0 [kdl_trim]: newlen: 0 [kdl_trim]: newlen: 0 [kdl_trim]: newlen: 0 [kdl_trim]: newlen: 0 [kdl_trim]: newlen: 0 [kdl_trim]: newlen: 0 [kdl_trim]: newlen: 0 [kdl_trim]: newlen: 0 [kdl_trim]:…
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了解高水位与truncate
什么是High Water Mark 高水位? “The high water mark starts at the first block of a newly created table. Ads data is inserted, the high water mark rises. And the HWM will remain at that level in spite of delete operations. The HWM matters since Oracle will scan all blocks below the HWM even when they…
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数据仓库:Oracle Exadata和Netezza的比较
虽然都是王婆卖瓜,但胜在他山之石可以攻玉,了解一下Exadata 之外的 一体机选择。
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Exadata用户的困境
当然这是Oracle-Sun Exadata V2 数据库一体机的竞争者,Netezza公司制作的一个小视频,但并非空穴来风! 很多人告诉我有了Exadata这么智能的一体机后都可以不需要dba了,那么这是事实吗? 就我个人的体验,部署了Exadata之后DBA花在管理上的时间更多了。 Exadata上复杂的数据库升级步骤: Infiniband Switch – > Exadata Storage Software – > Exadata Host Minimal Patch -> Grid Infrastructure – > Database 客户视角的Exadata 详细升级过程: Exadata Cells from 11.2.1.3.1 to 11.2.2.2.0 Exadata database nodes from 11.2.1.3.1 to 11.2.2.2.0 Applying a number of pre and post patching fixes (addendums…
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LIBCLNTSH.SO: WRONG ELF CLASS: ELFCLASS32错误一例
某套数据库以dba组用户登录正常,但以非dba组用户登录时出现LIBCLNTSH.SO: WRONG ELF CLASS: ELFCLASS32错误,如下例子: su – maclean sqlplus ld.so.1: sqlplus: fatal: /s01/orabase/product/10.2.0/dbhome_1/lib32/libclntsh.so.10.1 : wrong ELF class: ELFCLASS32 这里可以看到引起wrong ELF class的库文件(libclntsh.so.10.1)位于lib32目录下,说明该库文件是32位的。 一般来说只有安装了64位oracle软件时会同时出现lib和lib32 这2个存放库文件的目录, 当安装了32位oracle软件时则只会显示lib一个目录。 这也是判断所安装的Oracle数据库软件是64 bit 还是 32 bit的一种方法。 以上问题一般是由于设置了不正确的LD_LIBRARY_PATH 环境变量 , 或者 lib 目录、libclntsh.so.10.1权限不正确引起的。 建议通过以下步骤排查问题: 1. 检查 sqlplus 命令相关的so共享库文件 [oracle@vrh1 ~]$ ldd `which sqlplus` linux-vdso.so.1 => (0x00007fff0bbfd000) libsqlplus.so => /s01/orabase/product/10.2.0/dbhome_1/lib/libsqlplus.so (0x00002b450f6b4000) libclntsh.so.10.1 => /s01/orabase/product/10.2.0/dbhome_1/lib/libclntsh.so.10.1…
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Slide:了解Oracle critical patch update
了解Oracle critical patch update View more documents from Maclean Liu
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Slide:Upgrade 11.2.0.1 GI/CRS to 11.2.0.2 in Linux
Upgrade 11.2.0.1 gi crs to 11.2.0.2 in linux View more documents from Maclean Liu
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Booting Exadata!
Booting Exadata! It’s a joke here!.
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dbms_logmnr Unsupported SQLREDO
Question: Try Testing Oracle Logminer SQL> create table maclean (t1 varchar2(100)) tablespace users; Table created. SQL> insert into maclean values (‘MACLEAN’); 1 row created. SQL> commit; Commit complete. after start logmnr: sql> …add log file …. sql> exec dbms_logmnr.start_logmnr(options=>dbms_logmnr.dict_from_online_catalog + dbms_logmnr.committed_data_only); sql> select sql_redo from v$logmnr_contents; create table maclean (t1 varchar2(100)) tablespace users; Unsupported…
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Know more about RAC statistics and wait event
以下列出了RAC中的主要统计信息和等待事件: 1. Statistics: 1.1 V$SYSSTAT, V$SESSTAT (join to V$STATNAME) gc cr blocks served gc cr block build time gc cr block flush time gc cr block send time gc current blocks served gc current block pin time gc current block flush time gc current block send time gc cr blocks received gc cr block…