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weejar zhang when a long, running transaction has been rolled back, How Much Longer completion time of the rollback process? The questions are justified, because the transaction holds the locks and normal processing often suffers as the rollback progresses.
We use to import a dump file into a database today. impdp process was hang When the archive log destination disk space becomes full,I found this and drop older archivelog files from OS immediately. but disk space would be full as soon as I drop some files.and db was hang,I decided to terminate the impdp … Read more
有时需要清除schema里的所有对象，但又没有dba权限,不可以drop user xxx cascade; re-create user;可以写个plsql，循环删除所有对象，注意有些对象存在依赖关系，如外键、index 和table..,这里建个procedure，方便在开发库一堆有schema中运行。
如果primary db 丢失或不再需要的physical standby ，想把这些库(standby)利用起来，logical standby 本来就可以write open，11g ADG也可以APPLY LOG时open,但是read only，下面演示如果把off-line standby 转为primary,open read/write mode.
自定义生成一些报表，曲线数据从AWR 数据表。
CBO优化器的内部有两个重要的标准：selectivity and cardinality，cardinality 就CBO在处理完后返回的行数，selectivity是返回数据范围百分比，cardinality = (number of input rows)* selectivity,所以selectivity 的直接影响了CBO表访问路径
我是习惯在sqlplus中做一些操作，在linux中安装rlwrap 支持方向键，但如果多个用户在同一台机器上登录，每个人常用的命令不同，方向键查找起来很麻烦，so.那就把我们经常用的操作分类或以用户分类，设立独立的历史操作记录log
Hint提示是优化SQL的一种手段，但不应该放在首位，记的国外有位大师说过顺序应该是学写SQL，写更好SQL，学写ORACLE SQL，写更好的ORACLE SQL，在了解原理且CBO没有走理想路线的情况下再去指引CBO。
有时需要参考一些隐藏参数值了解ORACLE内部的限制,在sqlplus 中使用show parameter 显示隐藏参数..
Session cursor caching does not mean that server process caches the whole SQL area in the PGA.It just means that Oracle does not release the cursor object when the same statement was executed more than 2 times in the same process…
今天看到一个案例，从10G升级到11GR2后cpu负载迅速上升，很快达到100%,通过OWI显示出现大量“Cursor: mutex S”事件，mutex S是发生在cursor cache上的序列化mutex
Oracle Management Agent 12c communicates only with Oracle Management Service 12c and not with any earlier release of Enterprise Manager
EM 12c在安装时和11EM相似，只是增加了Plug-ins 的选择，Plug-ins 和 Connectors做为GRID CONTROLE的扩展并增加了一些非oracle的产品整合为”Cloud”云管理包含DATABASE,Middleware,VM server
GGSCI (ggsdb) 1> alter replicat ricme, extrba 84510103
REPLICAT altered.
GGSCI (ggsdb) 3> start ricme
the cause:
bug,related to name resolution issues, bind buffer length, fine grained access control, cursor invalidation, or any of the other common structural or coding reasons for multiple child cursors
DB_FILE_MULTIBLOCK_READ_COUNT is one of the parameters you can use to minimize I/O during table scans. It specifies the maximum number of blocks read in one I/O operation during
When he tried deleting archivelog manually with RMAN on primary db host, he got following warning:
“归档日志未删除, 因为备用或上游捕获进程需要它”
除了linux中长用的vmstat,iostat,top,sar等工具外有两组轻量的工具也值的推荐，
一个就是经典的IBM 的nmon+nmonanalyser
另一个是Collectl+Graphite
Memory Notification: Library Cache Object loaded into SGA
Heap size 106084K exceeds notification threshold (51200K)
KGL object name …
When job execution fails, the SNP processes attempts to rerun the job one minute later. If this run fails, another attempt is made in two minutes and another in four minutes. The job queue doubles the retry interval until it exceeds the normal execution interval..