Oracle

Round (x [, y]) [Function] returns the rounded value.[Parameter] x, y, numeric expression. If y is not an integer, the y integer is truncated. If y is greater than 0, the rounding is y decimal, if y is less than 0, it is rounded to the y place to

Problem description:Some of my friends often encounter the problem that I entered the correct Chinese. Why is there a garbled code in my queries on another computer? In fact, this problem occurs when the database performs Character Set

When you use start with connect by nocycle priorWhen performing recursive data search, the performance of the following two sections of code must be significantly different. For more information, please note that the code can be directly summarized

After finishing the project yesterday, I asked the test to test it. The test said that paging query does not seem to work. After Turning to page 4th, the data results will be the same.At that time, I was puzzled. It was impossible. The paging

How does one return table variables in Oracle functions?It's too late, so I won't talk about it if I have too much theoretical knowledge. Let's talk about implementation in a simple way !..1. Create a table object type.To return table objects in

Principle 1: Pay attention to the connection sequence in the WHERE clause:ORACLE uses the bottom-up sequence to parse the WHERE clause. According to this principle, the join between tables must be written before other WHERE conditions. The

This article will introduce some interesting functions that trisi often uses in daily life, or which are rarely used. There are two types of introduction:Famous functions-frequently used functionsNon-famous functions-although rarely used, they are

Copy codeThe Code is as follows:Create table T_NEWS(Id number,N_TYPE VARCHAR2 (20 ),N_TITLE VARCHAR2 (30 ),N_COUNT NUMBER)Prompt Disabling triggers for T_NEWS...Alter table T_NEWS disable all triggers;Prompt Loading T_NEWS...Insert into T_NEWS (ID,

1. su-oracle is not required. It is suitable for use without a DBA password. You do not need a password to enter the sqlplus interface.2. sqlplus/nolog, sqlplus system/manager, or./sqlplus system/manager @ ora9i;3. SQL> connect/as sysdba; (as

Write a circular deletion process.Create or replace procedure delBigTab (p_TableName in varchar2, p_Condition in varchar2, p_Count in varchar2)AsPragma autonomous_transaction;N_delete number: = 0;BeginWhile 1 = 1 loopEXECUTE IMMEDIATE'Delete from' |

The ORACLE tutorial is: Oracle acquires TimesTen to improve database software performance. Oracle announced in June 9 that it had agreed to acquire TimesTen, a private software company whose products can improve the performance of database

The ORACLE tutorial is: Analysis and Solution 2 of common ORACLE error codes.--------------------------------------------------------------------------------P align = "JUSTIFY"> ORA-01578: Oracle data block upted (file # num, block # num)Cause: When

The ORACLE Tutorial we are reading is: Experience in Oracle Database System 6. 1. having clause usageThe having clause controls the row groups determined by the group by clause. The having clause conditions allow only constants, clustering functions,

The ORACLE tutorial is: Use of Oracle Database snapshots. An oracle Database snapshot is a table that contains query results for one or more tables or views on a local or remote database. Because snapshots are a subset of a master table, using

1. view the currently unlocked object Example: Execute select * from aa for update to lock the table aa;Method 1: query by SQLSelect 'alter system kill session ', ''' | trim (t2.sid) |', '| trim (t2.serial #) | ''';'From v $ locked_object t1, v $

DBAs often encounter unlocking Oracle users in their daily work. This article describes how to unlock Oracle users using the command line, you can use several simple unlock statements to complete this task. The specific process is as follows: Scott

During the past two weeks, I have been busy with the migration of databases. When I did not do it, I felt it was very easy, but I was dumpfounded when I did it. This tangle,Here we will first talk about the problem:1. Database Table Structure

It is as follows: Control File: A file used to control the behavior of Data imports (the most important file ). Parameter file (optional) Data File: a flat file for storing source data Error file: when loading data, put the data that cannot be

Because:1) improve performance:Try to store the table and index tablespaces on different disks, and split the two types of data with different IO properties, which can improve the overall I/O performance of the disk; 2) Ease of management:If the

1. log on to the server and create rman to automatically delete the archived log script two days ago.[Oracle @ 108 ~] $ Cat> del_ora_log.rman Crosscheck archivelog all;Delete noprompt expired archivelog all;Delete noprompt force archivelog until