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Oracle sort paging query and MySQL database statements are not the same, here is a simple record. Sort by operation time 1 SELECT A.*, ROWNUM RN FROM (SELECT * FROM v_log) A ORDER BY operatetime DESC Result It can be found that it is sorted by time, but rownum is not from small to large, because oracle becomes rownum, and then it needs to que ...

Master Note: Troubleshooting guide for Automatic Undo Management (Doc ID 1579081.1) APPLIES TO: Oracle Database - Enterprise Edition - Version 9.2.0.1 to 12.1.0.1 [Release 9.2 to 12.1]Information in this document applies to any platform. PURPOSE This is a Master Note for troubleshooting the various issues reported on Undo Management. This docu ...

concept   Nonpartitioned tables can be moved as an online operation without blocking any concurrent DML operations. A table move operation now also supports automatic index maintenance as part of the move. Non partitioned tables can be moved as online operations without blocking any concurrent DML operations. A table move ope ...

   this article takes the initial EMP table of SCOTT users as a reference. The code can be used directly. The statement to query the structure of the EMP table is as follows, code 1: DESC EMP; The structure of EMP table is as follows: [result 1]: SQL> DESC EMP; //Is the name empty? Type -------------------------- ...

Phenomenon: the database service and monitoring run normally, but the function module is very slow to open;Process:I. check the database alert? Oaxx.log logLog switching is not high, no error is reported; database load is not large;II. Check database statusThe service and monitoring are running normally, sqlplus / as sysdba login is normal, an ...

Mirror version Search oracle on docker hub and find a xe 11 image. docker pull deepdiver/docker-oracle-xe-11g The image size is about 1G, and it is about 2.7GB after decompression. Function docker run -d -p 1522:22 -p 1521:1521 --name oracle deepdiver/docker-oracle-xe-11g Use the above command to run oracle. Wait about 1 minute, use ssh root ...

This time, a slight revision was made, and the algorithm and the English document were split. The specific content has been output in the previous two days'articles, so a summary of these two parts is made in this article. Of course, the technical aspects are output here first, then consider the rectification.Step by step, and break up the cont ...

insert all is used to write data in batch in oracle Now let's directly learn from the example, which is relatively simple and intuitive. The example comes from the book harvest, not only SQL optimization. Environmental preparation create table t as select object_name,rownum as object_id from dba_objects where rownum<=10; Create ...

The following Automatic Workload Repository is represented by AWR 12c is self managed most of the time. Maintenance tasks run automatically and diagnostic information is collected regularly. Diagnosing performance problems is time-consuming and requires skills. 12c has the Alert system and diagnostic ad ...

This article describes how to deploy a sharded database with adg function. 1. Environment introduction The roles and database versions of each node are shown in the following table:The instance name is named by the system itself. 2. Create Shard Catalog Database Here we use the silent method to create the directory database on odb01. [oracle@o ...