Last year, banks are doing the project, processing of data management are very big, so very concerned about the efficiency of insert, here and share with you I usually do a lot of data in the insert of some experience. 1. insert into tab1 select * fr ...
Read a few interviews Title: Some employees table empinfo ( Fempno varchar2 (10) not null pk, Fempname varchar2 (20) not null, Fage number not null, Fsalary number not null ); If the amount of data is about 10 million; to write a What do you think th ...
Oracle in the extent raison d'être: to improve management efficiency extents of the features: 1: an extent by the connected component of multiple blocks, multiple extents to form a segment, 2: oracle allocate space for the segment is based on ext ...
http://dev.csdn.net/author/Rayfly/b850da865b3b4cc89008a2004dad56fc.html Man / Ray To do the project when a colleague when the guide data is not accidentally all the data in a table engage in heavier, that is, all the records in this table have a repe ...
1, by creating a temporary table Data can be imported into a temporary table, then delete the original data table, and then guided back to the original data table, SQL statement is as follows: Demand can be achieved this way, but it is clear that 10 ...
1. Form Guide Division a, the size of the table partition table for large, would be beneficial to the operation of a great performance and a great deal of data maintenance. Typically, when the size of the table more than 1.5GB-2GB, or for the OLTP sy ...
oracle-fast delete duplicate records Text / Ray When do the project, guided data when a colleague is not accidentally all the data in a table out heavier, that is, the table has a record of all duplicated. The data in this table is 10 million, and th ...
rn dba trouble Terminator Road rnrn Perhaps you tired towards the development of five nights six and began test ocp; maybe you just out of the ivory tower, determined to make a big fight in the database management? After over the pages of its efforts ...
In the 10 million people have already met you, fate ah. . . . . . Great summary of commonly used commands oracle (1) [2005-03-04 09:29] [] [] first chapter house software: Log Management 1.forcing log switches sql> alter system switch logfile; 2.f ...
