5.混合SQL操作:Miscellaneous SQL operations Some examples are GROUP BY, NOT IN, SELECT DISTINCT, UNION, UNION ALL, CUBE, and ROLLUP, as well as aggregate and table functions. 6.Parallel query 如select, DDL或者DML操作含有select语句的情况 7.SQL*Loader,这个应当重视。用于数据多的导入,如 sqlldr U...
SQL>show parameter statistics_level;NAMETYPEVALUE---statistics_level stringTYPICALSQL>show parameter control_management_pack_access;NAMETYPEVALUE---control_management_pack_access stringDIAGNOSTIC+TUNINGSQL>select'Leshami'Author,'http://blog.csdn.net/leshami'Blog,2'645746311'QQfrom dual;AUTHORBLOGQQ---...
SQL> EXEC DBMS_SQLTUNE.execute_tuning_task(task_name => '1k659753fzcxn_awr_tuning_task'); PL/SQL 过程已成功完成。 SQL> SET LONG 999999; SQL> SET PAGESIZE 1000 SQL> SET LINESIZE 200 --查看Tuning advice: SQL> SELECT DBMS_SQLTUNE.report_tuning_task('1k659753fzcxn_awr_tuning_task') A...
SQL> show parameter audit; NAME TYPE VALUE --- --- --- audit_file_dest string /oracle/admin/orcl/adump audit_sys_operations boolean TRUE audit_syslog_level string audit_trail string NONE 修改参数的语句格式为: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 alter system 参数=值scope=spfi...
audit_file_dest string C:\ORACLE\ADMIN\ORCL\ADUMP audit_sys_operations boolean FALSE audit_trail string DB 查看系统当前时间,避免因时间有误导致日志记录时间不准确 select sysdate from dual; 1、查看普通审计 (1)查看审计的启用情况 show parameter audit_trail; ...
SQL> insert into test(id, name) values(1, null); 1 row created. SQL> insert into test(id, name) values(2, ''); 1 row created. SQL> insert into test(id, name) values(3, ' '); --符号中' '有一个空格 1 row created.
The following paragraphs below describe the intersect, union, and minus operations in greater detail. Intersect Union Minus SQL Commands The correct commands for the scenarios are: INTERSECT:Find out which employee has updated at least one record in the PRODUCT table and added at least one record...
server-id = 1 2 确认binlog_format ---确认格式为row show variables like 'binlog_format'; 3 确认sql_mode ---确认包含STRICT_TRANS_TABLES show variables like 'sql_mode'; 4 确认版本 ---确认版本,5.7.10之后才支持部分DDL (CREATE TABLE, ALTER TABLE, and DROP TABLE operations are supported...
In a SQL record system, a soft delete is a technique where, instead of physically removing a record from a database, you mark it as "deleted" by setting a specific flag or column. This allows the record to remain in the database, but is logically excluded from most operations. To dele...
comparisons so that their lengths match before comparing them. The padding directly affects the semantics of WHERE and HAVING clause predicates and other Transact-SQL string comparisons. For example, Transact-SQL considers the strings 'abc' and 'abc ' to be equivalent for most comparison operations...