Oracle

After installing the iReport-3.7.3, connect to the Oracle 10g Database in JDBC mode, the following occurs:Java. Lang. classnotfoundexception: Oracle. JDBC. Driver. oracledriver Error   The reason is that ireport does not find the Oracle10g JDBC

A ORA-02778 error is reported when you manually create a database. ORA-02778: Name given for the log directory is invalid The reason is:: Some directories in $ oracle_base/admin/$ oracle_sid are not created, such as bdump, cdump, pfile, and udump.

I helped a friend with Oracle cross-database operations a few days ago and shared the specific operation process: 1. database with different IP addresses (dblink) Local Database IP address 10.56.7.26 Remote database IP address 233.215.219.8 1

Think of instr (), review: ========================================================== ==================== Instr (source string, target string, start position, matching serial number)Example: Select instr ('this is his book. ', 'is', 3, 1) from

Recently I want to optimize some SQL statements for full table scan. The first thing I think of is index creation. I checked the online information and said that if there is null or is not null in the WHERE clause, the index will not be used, but I

This section describes how to configure the connection pools of Oracle, SQL Server, Sybase, and MySQL databases under websphere, and provides examples of corresponding connection pools. Compared with WebLogic, the configuration of the WebSphere

This section describes how to configure the connection pools of Oracle, SQL Server, Sybase, and MySQL databases under websphere, and provides examples of corresponding connection pools. Compared with WebLogic, the configuration of the WebSphere

  The listener. ora, sqlnet. ora, and tnsnames. ora configuration files of the Oracle network are all stored in the $ ORACLE_HOME \ Network \ ADMIN directory. 1. sqlnet. ora ----- is similar to the nsswitch. conf file of Linux or other UNIX. It is

1. Execute immediate will not commit a DML transaction execution and should be committed explicitlyIf you use execute immediate to process DML commands,Before the execution is complete, you need to submit it explicitly or as part of execute

There are many methods to modify the/dev/Hello permission. Now I put it in ueventd. sun7i. RC under device/softwinner/Wing-xxxx/. Modify: Diff -- git a/ueventd. sun7i. rc B/ueventd. sun7i. RCIndex d79557e .. 0bb9fb0 100644--- A/ueventd. sun7i. RC++

Create a MyApp under/packages/apps/and use eclipse to create a project, so that you can use ADT to generate configuration files quickly, copy/packages/apps/MyApp/GEN/COM/example/MyApp/R. delete the classes defined in Java. Do not repeat them. The

When I checked the Stored Procedure Code of the old system, I found that the assignment operation was: Select 1234 into v_value from dual; This syntax. I used to develop SQL Server. in SQL Server, I also use the syntax select v_value = 1234 to

Note: Oracle is slow due to unknown reasons. Recently, it is found that the Oracle server is super slow, and the slow speed is not caused by application performance. Even running proc precompiled programs is very slow. It can be seen that the

Since last week, a problem occurred in the Oracle database on the server. In less than half a day, the maxsession (150) problem will be reported. It must be because the maximum number of database sessions has exceeded.Because the server runs a file

1. null Concept    There is an important concept in the database: null. Sometimes, in a table, some field values may be null because the data does not know the value or does not exist at all. 2. null value judgment    The null value is not equal to

From: http://space.itpub.net /? Uid-7656893-action-viewspace-itemid-664954 Step 1: Calculate the size of the entire block HeaderThe size of the data block header space is calculated by the following formula:Space after headers (hsize) =

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Configuration file: --> {Call p_test (?, : Vpostno )} Stored Procedure: Create or replace package testpackage Type test_cursor is ref cursor; End testpackage;   Create or replace procedure p_test (p_cursor out testpackage. test_cursor,Vpostno in

Oracle development often suffers from invalid stored procedures and functions from time to time, so I made up my mind to solve this problem. I found a good solution and modified it On the basis, I finally solved the problem. 1. Create a stored

User_xxx all_xxx dba_xxx -- the data dictionary stores Oracle system information. Analyze System user, table, and index information --------------------------------- select sum (bytes)/(1024*1024) as "size (m)" from user_segments where segment_name =