【DB笔试面试774】在Oracle中,闪回恢复区(Fast Recovery Area,FRA)是什么?如何监控FRA? DB_RECOVERY_FILE_DEST指定了快速恢复区的位置,这个位置可以指向磁盘,也可以指向ASM磁盘组;DB_RECOVERY_FILE_DEST_SIZE参数定义了快速恢复区的大小。...快速恢复区至少应为数据库大小的两倍,以便可保留一个备份和若干归档...
ERROR:53100: couldnotcreatefile "base/16392/166691646":Nospace leftondevice CONTEXT:SQLstatement"create table test43(id int primary key, c1 int unique, c2 int unique)" PL/pgSQLfunctioninline_code_blockline5atEXECUTEstatementLOCATION: mdcreate, md.c:304 报错的PG源码文件如下 /* * mdcreate() ...
我有一个类似这样的查询: select * from employee where (employee_id in (SELECT DISTINCT BlockSubTable.id IN ( 398 ) ))) 现在,我的employee_id是10位数,子查询的输出是我尝试使用left('',10)来匹配子查询输出,但在misplaced left function<e 浏览106提问于2020-08-13得票数 1 回答已采纳 1回答 Pos...
0 Oracle SQL error ORA-00907: missing right parenthesis 29 ORA-00907: missing right parenthesis 1 ORA-00906: "missing left parenthesis" 0 ORA-00906:"missing left parenthesis" in sql developer 2 Getting 'ORA-00907: missing right parenthesis', cannot find error 1 SQL : ORA-00906: miss...
LEFT_SHIFT Function The left bit function moves bits to the left. Let’s cover the syntax first to understand how it works: LEFT_SHIFT(value,shift number) We have two arguments: The value or expression is the value we want to move bits. This value can be an integer or binary value. ...
it can be converted in different ways. In that example, when the GROUP BY clause is not used in aggregation, the result of the CROSS APPLY is the same as OUTER APPLY as the MAX() function still returns a row (NULL) if the condition does not match. In contrast, when GROUP BY is u...
The build-in Oracle function (STATS_CROSSTAB) can give us the value of Chi-squared (CHISQ_OBS) , the degree of freedom (CHISQ_DF), and the statistical significance (CHISQ_SIG). What we are interested in is the statistical significance. A number less that 0.05 indicates that the data is...
apply cross apply function on condition Arabic question mark Arduino and SQL Server Are there any Bitmap(ped) indexes in SQL Server? Are there MIN(A,B) or MAX(A,B) functions in SQL? Argument data type datetime is invalid for argument 3 of json_modify function Argument data type sql_vari...
% of what I need it for, but there will still be edge cases. For these edge cases, we always have the more code intensive options available to us. This is why PowerShell is so great, there’s always another way, whether it’s writing more detailed code or using a community function...
() should behave like the corresponting version of SUBSTR() LEFT('MYSQL',2) == SUBSTR('MYSQL',1,2) and LEFT('MYSQL',NULL) should return NULL like SUBSTR(MYSQL',1,NULL) does b) SUBSTR('MYSQL',-10,1) retuns '' empty string other DMBS (Oracle) return NULL in this case. IMHO ...