Oracle

1. The LONG data type stores variable-length strings with a maximum length limit of 2 GB. 2. For text that exceeds a certain length, the LONG type can only be used for storage. Many objects in the data dictionary are defined as LONG.1. The LONG

1. in oracle, the data table alias cannot be added with as, for example: Select a. appname from appinfo a; -- correct Select a. appname from appinfo as a; -- Error Maybe you are afraid of conflicts with the keyword as in the oracle stored procedure.

1. Install JDK Create a Temporary Folder under/tmp [Root @ lsjlinux root] # cd/tmp [Root @ lsjlinux root] # mkdir javacn [Root @ lsjlinux tmp] # cd javacn 　　 Download the j2sdk-1_4_2_02-linux-i586.bin from the sun website and save it to/tmp/javacn 　

@ Echo offREM ####################################### ####################REM # Windows Server 2008 Oracle Database automatic backup batch processing scriptREM ####################################### ####################REM obtains the current

Here is a question about csdn. Correct the error. The image function requires statistics on the data in a table.Table definition (Omitted fields not used)LB01_PURRECEIVEBOOK(Purreceivedate date, -- format: 2009/11/01RECEIVEAMT NUMBER)① In annual

Select upper (F. TABLESPACE_NAME) "tablespace name ",D. TOT_GROOTTE_MB "tablespace size (M )",D. TOT_GROOTTE_MB-F. TOTAL_BYTES "used space (M )",TO_CHAR (ROUND (D. TOT_GROOTTE_MB-F. TOTAL_BYTES)/D. TOT_GROOTTE_MB * 100,2 ),990.99) "usage ratio ",F.

  WorkloadWorkload is also referred to as Active Time. workload is a measurement of the Oracle instance's net processing time, measured in seconds. workload is calculated by aggregating the net activity (non-idle time) for all Oracle processes.

Duplicate Database example In the following example of active database duplication, a connection is established to three database instances, all through the use of net service names: RMAN> CONNECT TARGET SYS/sysdba@prod; # source

[Oracle] using a trigger to restrict user logon to Oracle is not as convenient as MySQL, and IP restrictions can be directly imposed on users. Oracle must implement user-level IP restrictions, you can use a trigger to achieve this. The following is

Several minor issues with Oracle Automatic Memory Management (1) after automatic memory management is enabled, what if the pool value is set to a non-0 value? For example, if sga_target = 10G is set, but java_pool_size is set to 10 m, 10 m will be

IOT (Index Organized Table) We know that normal tables are Organized in the form of heap, which is a disordered organization. Oracle also provides an ordered table, which is an index organization table (IOT table. The IOT table must have a primary

Oracle Auto-increment mode 1. Maintain auto-increment mode by using the oracle feature sequence Create sequence emp_sequence increment by 1 -- add several start with 1 each time -- count NOMAXVALUE from 1 -- do not set the maximum value NOCYCLE --

Oracle Installation Question 1. note: before installing oracle, make sure that your IP address and host (Computer) name are not modified. 1. download the package and place it in the English Directory d: \ tools (do not have any Chinese characters) 2.

Convert ORACLE lowercase to uppercase Create Or Replace Function Money2Chinese (Money In Number) Return Varchar2 Is strYuan Varchar2 (150); strYuanFen Varchar2 (152); numLenYuan Number; numLenYuanFen Number; strRstYuan Varchar2 (600 ); strRstFen

Oracle Logminer Performance Test 1 test Introduction 1.1 The purpose of the test is to simulate the running status of LogMiner parsing online/archive log files in different environments and analyze the data obtained through the test, verify the

SQL Optimization-the role of hint currently, oracle uses the CBR optimizer, so in some cases, the machine will execute the SQL as needed, of course, oracle makes decisions based on some of its own information, such as statistical information.

Binding Oracle Database to ActiveReport can interact with multiple data sources, including OLEDB, SQL, XML, and collection objects. This article describes how to bind an Oracle database to ActiveReport. This is an easy task. The following describes

Oracle Stored Procedure paging code [Html]/********* Stored Procedure paging code **********/-- Baotou create or replace package pck_my is type c_my is ref cursor; procedure page_moed (v_table in varchar2, -- table name current_page in out number, --

ORACLE string buffer is too small solution today we encounter a problem where the string buffer is too small because we use the ORACLE aggregate concatenation function WM_CONCAT. The error message is as follows: 1 ### Error querying database. cause:

SHUTDOWN: Active processes prevent shutdown operation: When shutdown immediate is used to shut down the database, hang is used to view the alert Log, and SHUTDOWN: Active processes prevent shutdown operation is encountered. That is to say, some