Oracle

When passing parameters, the array is the most efficient. If possible, use arrays more. In Oracle ProgramThe following conditions are required to use arrays in the package: . Net Oracle-oriented drivers, including oledb, Ms oracleclient, and

First Code Paste it here and explain it later, for fear of forgetting :) If any expert finds an error or is inappropriate, please point it out immediately. Thank you. Declare Type name_list Is   Table   Of   Varchar2 ( 40

Using System; Using System. Data; Namespace Com. CUC. Wu. Example { Public   Class Class1 {// For SQL Server, the isolation level of a connection-related transaction is // Repeatable read or serializable. For Oracle, use select

Generally, @ XXXXX. SQL is enough. Create a schema first. Here I understand that the solution in Oracle is actually equivalent to "Database" in other databases, because ifThere are no special requirements. In fact, you can create different

1. Calculate the size of the redo Block Lgwr writes redo data to the disk in blocks. The redo block size is Oracle. Source code Fixed in, related to the operating system. Generally, the operating system is 512 bytes, such as Solaris, Aix,

1. Show operation timeSet timing on; 2 nvl (Comm, 0). If comm is empty, 0 is displayed; otherwise, comm is used.3 when groupy, having, and order by exist at the same time, group by must appear first, and thenIs having, and order4 select * from

Earlier in February April, I received a subscription email from Oracle titled coming soon: fully managed ODP. Net beta, which said it would release pure hosting.CodeODP. Net (Oracle Data Provider), and introduces some features, which are directly

Use the database trigger to correspond to the startup event Create trigger log_routine after startup on Database Begin Exec yourproc; End; Appendix:High score for help: Why cannot I trigger the startup trigger?When I create a startup trigger, I

Source: http://www.cnblogs.com/zjrstar/archive/2006/08/31/491090.html For rownum, it is the number of the row returned from the query that is sequentially allocated by the Oracle system. The first row is allocated 1, and the second row is 2, this

An Oracle Database snapshot is a table that contains query results for one or more tables or views on a local or remote database. The following describes how to use a snapshot to accelerate the query speed in the 170 call reminder system of Xiangfan

Without the temptation of roommates, I installed Windows 7 OS on my computer in my spare time.   JDK installation for Windows 7 is unobstructed during eclipse installation. However, when installing Oracle, a problem occurs in the first step,

Method 1: Currently, most databases require distributed queries. The following describes how to configure cross-database access in Oracle. For example, there are two database servers and two databases are installed. Database Server A and B. Now,

If Oracle client x86 is installed, the system. invalidoperationexception error is returned when you access the Oracle database using. Net: badimageformatexception is thrown when you attempt to load the Oracle client database. This problem occurs

There is a new feature in 11g. When the table has no data, no segment is allocated to save space. Solution: 1. Insert a row and then roll back to generate a segment. This method inserts data into an empty table and then deletes it, resulting

Assume that, as shown in the following table, the number of rows corresponding to each I value is not fixed. SQL> select * from T; I a d---------------------------------------1 B 10:55:421 A 2008-03-27 10:55:461 D 10:55:302 Z 2008-03-27 10:55:552

Oracle's imp/exp component is a common tool. One of its operational principles is Backward compatibility . The following are the usage rules and related tests summarized as follows: Rule 1: earlier versions of exp/IMP can be connected to database

The following are common operations and basic commands in development: Start listeningLSNRCTL start Disable listeningLSNRCTL stop Start DatabaseSqlplus as sysdbaSQL> startup Stop DatabaseSQL> shutdown immediate Start the dbconsole ServiceEmctl

The Blob and base64 of Oracle are used in recent projects. The scenario is to put images in the Oracle AS blob,Then, in WS, It is encrypted with base64 and returned. . Net ,. . NET and then decode and restore it. Process summary: 1. It is

In Oracle, to query the first N records according to specific conditions, use rownum.Select * from EMP where rownum The book also tells you that you cannot use ">" for rownum, which means that if you want to useSelect * from EMP where rownum> 5It is

1. What is an execution plan? An explain plan is a representation of the access path that is taken when a query is executed within Oracle. Ii. How to access data At the physical level Oracle reads blocks of data. the smallest amount of data read is