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weejar zhang Each time your program performs a function call, information about the call is generated. That information includes the location of the call in your program, the arguments of the call, and the local variables ..
This script displays the top 50 longest idle times and list distribution of sessions on the instance..
高parse calls表示这些SQL不可以re-used 并且每次执行都要重新解析，理想的最佳状态是一次解析多次执行，你也知道频繁的解析会给library cache带来沉重的负担， 一个sql的执行必须先parse，解析过程包含sql 加载到shared pool, 语法检查…
When multiple connection created will insert a lot of rows in aud$ table, there may be contention in the segment header for the table. This contention can manifest itself as a buffer busy wait or a freelist wait.
top – 14:32:11 up 104 days, 20:27, 1 user, load average: 19.31, 19.10, 19.06 Tasks: 390 total, 19 running, 371 sleeping, 0 stopped, 0 zombie Cpu(s): 99.5%us, 0.1%sy, 0.0%ni, 0.4%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 8164276k total, 8111804k used, 52472k free, 403596k buffers Swap: 16386292k total, 224k used, 16386068k free, 5560532k cached [root@webxxx ~]# ps … Read more
alter system set memory_max_target=0 scope=spfile;
shutdown immediate
startup
SQL> show parameter target
…
memory_max_target big integer 3824M
Exception [type: SIGSEGV, Address not mapped to object] [ADDR:0x10] [PC:0x938E8C5, dbgtrReserveSpace()+99] [flags: 0x0, count: 1]
Errors in file /oracle/diag/rdbms/ora11g/ora11g/trace/ora11g_ora_13864.trc (incident=60801):
ORA-07445: exception encountered: core dump [dbgtrReserveSpace()+99] [SIGSEGV] [ADDR:0x10] [PC:0x938E8C5] [Address not mapped to object] []
Incident details in: /oracle/diag/rdbms/ora11g/ora11g/incident/incdir_60801/ora11g_ora_13864_i60801.trc
Use ADRCI or Support Workbench to package the incident.
shell统计linux系统中每个程序的内存使用情况，因为内存结构非常复杂，不一定100%精确，
scn(system change number) 结构主要维护 oracle数据库内部的数据一致性，SCN 有两部分组成: Base and wrap，wrap 是16bit的数字，base是32bit的数字,这样其实就可以算scn的有效范围，它的格式(redo dump trace)是wrap.base，当base超过了2的32次方,然后wrap 就会加1，其实用sql 很好验证。
Why SQL Test Case Builder? For most SQL problems, the single most important factor for a speedy bug resolution is to obtain a reproducible test case. However, this is normally the longest and most painful step for customers. The goal of the SQL Test Case Builder (TCB) is to automatically gather as much information as … Read more
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
DDE: Problem Key ‘ORA 312’ was flood controlled (0x5) (no incident)
ORA-00312: online log 2 thread 1: ‘/oracle/oradata/icme/redo02.log’
Error 19527 creating/clearing online redo logfile 2
ORA-24247: network access denied by access control list (ACL)
ORA-06512: at “SYS.UTL_TCP”, line 17
ORA-06512: at “SYS.UTL_TCP”, line 267
2013-09-29 10:03:15 ERROR OGG-01028 Oracle GoldenGate Capture for Oracle, eicmec.prm: Object with object number 81069 is compressed. Table compression is not supported.
DEMO 1,How to use oradebug to call OS commands via the database
DEMO 2,Disable sys audit
ORA-39083: Object type JOB failed to create with error:
ORA-00001: unique constraint (SYS.I_JOB_JOB) violated
map icme.test_s, target icme.test_t,
COLMAP(usedefaults,
create_date =@IF(@STREQ(@GETENV(“GGHEADER”,”OPTYPE”),”INSERT”),@DATENOW(),@COLSTAT(MISSING)),
last_update_date=@datenow()
昨天一朋友问如果用GOLDENGATE同步数据(ETL)，如果目标端比源端多出一个时间字段表示最后的修改日期，OGG可以实现么？可以的，下面是我step-by-step 的演示.耗时两天做个总结，在这特殊日子也祝 各位 库友中秋团圆！ source db sid:icme tablename:test_t ————- |id ,name | ————- target db sid:ggs tablename:test_t —————————————- |id ,name, create_date, last_update_date| —————————————– create_date 取记录的生成时间 last_update_date 取最后DML的时间 Source DB — 建立新表 icme@ICME>create table test_s(id int,name varchar2(20)); — ogg 的配置文件，这是我之前配置源和目标库表结构一样的环境，有启用DDL同步,后面我会陆续修改，OGG安装参考以前的文章 GGSCI (icme-db) 2> view params eicmec extract eicmec —————————————— — local extract for icme schema change … Read more
因安装数据库时启用了ASMM,过了几天发现分配不太理想想禁用ASMM，手动调整shared_pool_size, 这是一个动态参数，修改后立即生效无需重启数据库实例，但修改时遇到了比较奇怪的现象。
•What is zabbix ?
•What can it monitor?
•Structure of ZABBIX and Componentes
通过将主服务器上备份出来的transaction log 传送到辅助服务器上并进行恢复,实现主从库的同步，有些类似mysql 的主从和oracle 的OGG，不过sqlserver 的日志传输当主服务器宕机的时候，日志传送功能并不能实现从主服务器到辅助服务器的自动故障转移功能，需要手动将辅助服务器切换到联机状态，使得辅助服务器上数据库来提供服务，从而实现数据库的高可用性。 Parimary DB ——————– IP: 192.168.217.240 OS: windows 2003 x64 DB: Sql server 2008 ——————– Secondly DB ——————– IP: 192.168.217.240 OS: windows 2003 x32 DB: Sql server 2008 ——————– Transaction Log data flow ————————- primary db –>backup e:\db_backup –> shared e:\db_backup as \\192.168.217.240\db_bacup | |secondly copy \\192.168.217.240\db_bacup to local e:\db_restore … Read more