excel 列匹配公式
在Excel中有时有需求,需要像数据库一样,做两个sheet或文件的关联,把一个表中匹配Key的值更新到当前Key的某一列,不想让把excel那么多字段导入db,就可以利用伟大的excel 公式做到实现
About Columns Order(列先后顺序)
有时总是忽略在列的顺序带来的性能开销,还有列的null值字段的位置,想理解这个问题要首先程序列数据是如何在block上存储的,并且是如何定位的?
配置11Gr2 physical dataguard,11203 RAC 到single instance
primary db是2nodes 11203 RAC,physical standby是11203 的single instance,Primary db有用到ASM存储文件,Single instance只用local filesystem
impdp network_link 在11201中导入分区表时行记录为0 rows?
. . imported “WEEJAR”.”HASH_OBJ”:”SYS_P23″ 0 rows
. . imported “WEEJAR”.”HASH_OBJ”:”SYS_P24″ 0 rows
. . imported “WEEJAR”.”HASH_OBJ”:”SYS_P21″ 0 rows
. . imported “WEEJAR”.”HASH_OBJ”:”SYS_P22″ 0 rows
GoldenGate 小测试initial load,extract change
模拟一种主库不停机,做个备库并initial load,并同步改变数据
安装配置GOLDEN GATE
源机启用本地Extract 进程抽取变化生成本地trail文件
remove a node from 11g r2 rac on OEL5(删除节点)
[grid@znode1 bin]$ cluvfy stage -post nodedel -n racnode3 -verbose
Performing post-checks for node removal
Checking CRS integrity…
Clusterware version consistency passed
The Oracle Clusterware is healthy on node “znode2”
The Oracle Clusterware is healthy on node “znode1”
CRS integrity check passed
Result:
Node removal check passed
Post-check for node removal was successful.