Oracle

[Q] how to view database character sets[A] database server Character Set select * From nls_database_parameters, which is derived from props $ and indicates the character set of the database.Client Character Set environment select * From nls_instance_

Create an Oracle10g file in/etc/init. d/and edit the following content in the file #! /Bin/shcase "$1" instart) # Start tsnlisnter echo "Start tsnlisnter" Su-Oracle-c "LSNRCTL start" # Start database echo "Start Oracle database instance"

1. Different identifiers. The identifier of the function is function and the process is procedure.2. In a function, variable parameters are generally not used, and function values are directly returned using the function name. If a return value

In the past, I heard from others on the website that the open source version of QT cannot connect to the Oracle database. Normally, I can compile a driver to connect to the Oracle database. Today I want to say yes. First of all, we need to prepare

Proxool is an excellent open source connection pool. I have compared the three connection pools DBCP, c3p0, and proxool to read and analyze their code. In contrast, proxool uses cglib, and its source code is quite concise and elegant.But

Use the like operator in the where ConditionThe wildcard "%" is used to represent 0 or more characters, while "_" is used to represent a single character.Eg: Where ename like's % ';Use the in operator in the where ConditionEg: where Sal in );Use the

1. select an appropriate Oracle optimizerThere are three optimizer types in Oracle:A. Rule (Rule-based) B. Cost (cost-based) C. Choose (selectivity)Set the default optimizer. You can declare the optimizer_mode parameter in the init. ora file, such

Create Table T8 (grade number (8); insert into T8 values (100); insert into T8 values (45 ); insert into T8 values (65); insert into T8 values (85); insert into T8 values (90 ); insert into T8 values (60); insert into T8 values (13); commit;

I have read some related posts and articles on the Internet, which are basically the same, but there are some differences in some places. Here I will summarize the differences between the two.   1. Delete generates rollback and related lock

The following J2EE applications have been configured and can be accessed using the URLs listed below. The database configuration file has been installed in E:/Oracle/product/10.1.0, and other selected installation components have been installed in E:

1. Save images to the Oracle database The structure of the example Table news is: newsid number (10), title varchar2 (100), image (BLOB) Method 1: Use the oraclecommandbuilder class (this class is used to automatically generate single table commands

Recently, I attended the middleware product strategic communication meeting. This is the first time that Oracle has officially explained the new trend of its intermediate products in China after the acquisition of Bea. Oracle in China"Focus" Li

Note: organize to Network   24HoursHh24 Select to_char (sysdate, 'yyyy-mm-dd hh24: MI: ss') from dual; Select to_date ('1970-01-01 13:14:20 ', 'yyyy-mm-dd hh24: MI: ss') from dual;   To_date () function 1.Date Format ParametersDescription DDay of

3) cursor 1. The basic principle of the cursor processes data results one by one. Low execution efficiency and resource occupation. 2. Whether the cursor attribute % found % isopen opens % notfound % rowcount the cursor adds 1 to each row to be

Http://www.inthirties.com/thread-757-1-1.html   It is a great honor to be invited as an oracle instructor in the csdn learning base camp. A netizen sent a message to discuss how to learn about oracle. I will reply and discuss it with you.   First,

Next, the origin of checkpoints for Oracle learning with inthirties"   The last time we talked about the origin of the checkpoint, the significance of the checkpoint is not the operation of the database itself, but its real value is reflected in the

1. SQL statement 1: -- 1. view the table space name and size select T. tablespace_name, round (sum (Bytes/(1024*1024), 0) ts_size from dba_tablespaces T, dba_data_files d where T. tablespace_name = D. tablespace_name group by T. tablespace_name;

Oracle primary key auto-increment 1. Compared with the local primary key number type, the ID is the max (ID) to obtain the table each time the data is stored, followed by + 1, the time can be used as the primary key and is unique. 2. The official

 Today I wrote a stored procedure, which requires a single quotation mark before and after the string variable. It seems that simple things have left me alone for one afternoon. Finally, I understood Oracle's abnormal rules.  OracleString connection

Official Website description Owid: a globally unique address for a row in a database.   Rowid can be divided into extended rowid and restricted rowied.   1.1 restricted rowid Internally, the rowid is a structure that holds information that the