然而，目前还很少有人知道，如果使用Active Directory集成DNS，任何用户都可以默认查询所有DNS记录。
/* 为了避免被flashback table骚扰,关闭了recyclebin回收站功能 */ SQL> conn maclean/maclean Connected. SQL> col segment_name for a20 SQL> select segment_name,bytes/1024/1024/1024 "size in Gbytes" from user_segments where segment_name='TV'; SEGMENT_NAME size in Gbytes --- --- TV 547.25...
on tablename (entp_id,sell_date),结果悲剧了,把所有的DML语句都阻塞了,导致系统不能正常使用,还好是晚上10点,用户不是非常多,1个小时候,索引结束,阻塞解决;上网查了一下,如果加上 online参数后,就可以在线做索引,而不需要阻塞所有的DML语句,血的教训,拿出来与各位共勉,具体online与不加online区别如下: 1. ...
调整列大小使行大小 <= 65535。 代码语言:sql AI代码解释 CREATETABLEtb_test(row1VARCHAR(10000)DEFAULTNULL,row2VARCHAR(10)DEFAULTNULL,row3VARCHAR(10000)DEFAULTNULL)ENGINE=INNODBDEFAULTCHARSET=utf8;tb_test 行长度为:10000*3*2+10*3=60020字节<63335// 创建成功CREATETABLEtb_test(row1VARCHAR(10000)DEF...
SETGLOBALinnodb_file_format=Barracuda;SETGLOBALinnodb_file_per_table=ON;SETGLOBALinnodb_large_prefix=1; 1. 2. 3. 状态图 下面是本文所介绍的问题的状态图: Row_size_too_largeReduce_column_sizeChange_to_TEXT_or_BLOB_typeAdjust_InnoDB_configuration ...
You use in-memory Online Transaction Processing (OLTP) in Microsoft SQL Server 2017, 2016, and 2014. You execute a query on a memory-optimized table that contains a large index. In this scenario, if you use the large index du...
(my table is 230-255GB large). 2. Start a load of the employees sample database. 3. While 2. is executing, drop the table from 1. 4. Monitor in a third connection with SHOW ENGINE INNODB STATUS. The size of the table is not all that important. It just must be large enough ...
We moved from MS SQL to MySQL about 6 months ago; and up to now not a single regret. In that 6 months we have accumulated a database with close to 3 million records. In our application we need to be able to select chunks of rows in the middle of the table. ...
Input: natural language questions, such as "Query the relevant information of the table t_user, and the results are sorted in descending order by id, and only the first 10 data are kept." Output: SQL, such as "SELECT * FROM t_user ORDER BY id DESC LIMIT 10" ...
PostgreSQL Multi-table Inheritance SQLVersionResultAccuracyTime SELECT count(*) FROM small_table; -- 2037104 100.0000000% 4.900s SELECT quick_count('small_table'); v0.0.5 1988857 97.63158877% 0.048s SELECT quick_count('small_table'); v0.0.6 2036407 99.96578476% 0.050s SELECT count(*) FROM ...