Why do drop tablespace completes the space is not available as free yet in ASM Diskgroup?（删除tablesapce后, ASM空闲空间没变）
前天有套库发现表空间分了很大但是使用的非常少，想收回多余浪费的空间放回ASM，删了两个表空间应该可以释放1T左右的空间，但是ASM DISKGROUP的free space时，并没有增长， 也就是删除的空间没有释放， 开始以为遇到了BUG， 其实原因很简单， 只是在这简单记录这个问题的提个醒。
Sessions remains and increase cumulatively never close if you use DEDICATED with XA transaction + shared dblink.
A web application using Tuxedo always keep 50 long connection to local database which then issues a SELECT from local db to remote db over shared db link(it’s created last weekend). But to run for a period of time after the found the remote db sessions become full(ora-18)
Troubleshooting ORA 600 [ktspfmdb:objdchk_kcbnew_3] 案例
前段时间数据库出现了几次ORA 600 [ktspfmdb:objdchk_kcbnew_3]错误，引起该错误的是一条insert sql.
Troubleshooting these are too many scheduler jobs(owner sys) name like KWQICPOSTMSGDEL_nn in DB 11g
I faced a very interesting question today, An oracle database 11.2.0.3 RAC database ON hpux one had to many scheduler jobs , And the job’s owner is sys, All jobs name all like ‘KWQICPOSTMSGDEL_’, All these jobs has no start date as well no interval.
How to estimate the cost if partition table missing partition level statistics ?（缺失分区表级统计信息如何计算多分区扫描的COST）
首先查看表的统计信息，分区表的统计信息分global stats(DBA_TABLE)和partition stats(DBA_TAB_PARTITION),发现该分区表是global stats 有，partition stats全为空， 查看该SQL发现有两个子游标有不同的执行计划
Troubleshooting ORA-600 [k2srec: should be another instance]
Problem Key: ORA 600 [k2srec: should be another instance]
Error: ORA-600 [k2srec: should be another instance] [2] [] [] [] [] [] [] [] [] [] [][00]
with the following stack :k2srec <- k2serv <- opiodr <- ttcpip
The Oracle Listener ofen restart and ora.net1.network check fails on HPUX (监听频繁重启)
上个月有套库的listener总是自动stop， 因为是crs的资源又被agent重新拉起，前几次的监听故障中都提到过listener依赖于network资源， 以前也处理过网络打嗝可能会导致监听频繁重启的案例，本次参照该案例修改弱依赖的方式无法避免该问题
The FG(server process) and remote node LMSn process communication over the interconnect?(用户进程会和另一节点的LMS进程直接通信么?)
应该存在local SERVER process和remote LMS process通信， 原厂的工程师给我看了他们的白皮书来证明应该只有LMS和LMS通信，究竟是什么情况， LMS会不会直接和远程的SERVER进程通信？
如果listener.log 不可写会怎样？ DBGRL Error: SLERC_OERC, 48180
listener会记录通过监听访问数据库的信息在listener.log，包括tnsping 监听的，但是如果listener.log不可写，监听会不会挂？ 前几天清理目录发现了这个有个目录增长比较快，在listener的trace 目录下(11g的 ADR目录diag/tnslsnr/anbob1/listener/trace)生成了一些奇怪的trace文件如下
‘latch: cache buffers chains’ & Don’t underestimate the rownum = 1
CPU + Wait for CPU CPU 21.64 41.99
log file sync Commit 21.63 41.97
enq: TX – row lock contention Application 19.71 38.23
buffer busy waits Concurrency 5.86 11.36
latch: cache buffers chains Concurrency 5.30 10.29
Performance tuning ‘wait for a undo record’ event
前几日一个数据库的负载非常高，查看数据库的活动会话发现大部分session在等待’wait for a undo record’的事件， 该事件通常发生在fast-start parallel rollback, 该特性通常是在SMON进程发现存在一个长时间的事务需要回滚，或遇到PARALLE DML需要回滚时，超过一定量的回滚任务时自动启动多个server process的并行回滚
Troubleshooting Instance crash after ora-7445[opiaba],ora-600 [kgh_heap_sizes:ds], ora-600 [17147]
ORA-00600: 内部错误代码, 参数: [kgh_heap_sizes:ds], [0x700000E82B30018], [], [], [], [], [], [], [], [], [], []
ORA-07445: 出现异常错误: 核心转储 [opiaba()+788] [SIGSEGV] [ADDR:0xF00000E161B7CD2] [PC:0x10662AFD4] [Address not mapped to object] []
Listener no register service& INTERMEDIATE status with “Not All Endpoints Registered” in 11gR2 RAC
是一套11GR2 的RAC 环境， CRSCTL CHECK CRS检查CRS 服务已无法通讯，当时也让他查询了crsd.bin 进程确认不存在了， 当时通知重启CRS便可以解决，但是后来通知客户端依旧有个节点无法连接，检查LISTNER 并没有注册任何SERVICE，而且当时也只监听在PUBLIC IP， 检查DB PARAMETER LOCAL_LISTENER 是绑定VIP，
Troubleshooting ora-7445 [kkqteParseSqlForPG()+1840] in 11g r2, Table expansion transformation
Exception [type: SIGSEGV, Invalid permissions for mapped object] [ADDR:0x63] [PC:0x107C00D30, kkqteParseSqlForPG()+1840] [flags: 0x0, count: 1]
Errors in file /u01/app/oracle/diag/rdbms/anbob/anbob1/trace/anbob1_ora_22283288.trc (incident=253347):
ORA-07445: 出现异常错误: 核心转储 [kkqteParseSqlForPG()+1840] [SIGSEGV] [ADDR:0x63] [PC:0x107C00D30] [Invalid permissions for mapped object] []
Troubleshooting ora-07445 [__lwp_kill()+48] [SIGIOT] error and instance crash
Exception [type: SIGIOT, unknown code] [ADDR:0x6CA9] [PC:0xC0000000003125F0, __lwp_kill()+48] [exception issued by pid: 27817, uid: 1024] [flags: 0x0, count: 1]
Errors in file /oracle/app/oracle/diag/rdbms/anbob/anbob1/trace/anbob1_lms3_27817.trc (incident=704134):
ORA-07445: exception encountered: core dump [__lwp_kill()+48] [SIGIOT] [ADDR:0x6CA9] [PC:0xC0000000003125F0] [unknown code] []
After OS reboot, Ohasd(cssd) start fail is due to OLR corrupted
前几天帮助同事处理了个案例， 主机意外重启后数据库无法启动， 环境是11.2.0.3 standalone o […]
Troubleshooting Instance crash when modify db_cache_size, ora-600 [kmgs_pre_process_request_6]
ORA-00600: internal error code, arguments: [kmgs_pre_process_request_6], [6], [895], [0], [3], [0x459C1F3D8], [], []
Mon Dec 22 22:40:43 2014
MMAN: terminating instance due to error 822
Instance terminated by MMAN, pid = 31205
Troubleshooting ORA-12012&ORA-29283&ORA-06512 issue
ORA-12012: error on auto execute of job “ORACLE_OCM”.”MGMT_CONFIG_JOB_2_2″
ORA-29283: invalid file operation
ORA-06512: at “SYS.UTL_FILE”, line 536
ORA-29283: invalid file operation
ORA-06512: at “ORACLE_OCM.MGMT_DB_LL_METRICS”, line 2436
ORA-06512: at line 1
Oracle Database History
In 1977 Larry Ellison saw a IBM Journal of Research and Development, discovered a research paper that described a working prototype for a relational database management system (RDBMS). Showing it to coworkers Bob Miner and Ed Oates at Ampex .
