what is oracle vm virtualbox

I doctor became too big to forget the Oracle SYS user and system user password, and after several attempts to log on to system, the system is locked.After some attempt, finally solved. The process is as follows:First, rebuild the sys password file. The Reconstruction method is:1. Open cmd Command window;2, execute orap

Method Find Symcjit.dll, find two places, both JRE (Java Runtime Environment) Rename the two files to Symcjit_.dll and install them, which can be completely normal. Install hardware (already installed properly): Server:dell PowerEdge 2600 Dual Xeon 2.8G 1G Ram PC:P4 2.4GB 512M Memory Description A few days ago under the Win2000 installed two years ago, Oracle 8.1.7 ntee Release 1 (Enterprise Edition), found that after running the setup file, th

This article describes the maximum length that a table name can use in the Oralce database. This length is also the maximum length of the Oracle identifier, which is 30 characters. Small weave today, when an Oracle database table is being built, it

Tags: select process another business PST TPS definition VPS RelatedA trigger (trigger) is a special stored procedure whose execution is not invoked by the program or manually, but is triggered by an event, such as when an operation on a table (Insert,delete, update) activates it for execution. Triggers are often used to enforce data integrity constraints, busine

In oracle, what happens when a value in date time format is inserted into a field in varchar2 format ?, Oraclevarchar2 -- Create Table test1 Create table TEST1(ID VARCHAR2 (40) default sys_guid (),TDATE VARCHAR2 (200))Tablespace APP_TX_DATAPctfree 10Pctused 40Initrans 1Maxtrans 255Storage(Initial 64 KMinextents 1Maxextents unlimited); -- Insert date time format

Tags: delete save cannot dictionary create pre auto drop otherwiseThe Oracle database can also create temporary tables in addition to saving permanent tables. A temporary table is a nologging that is stored in a temporary table space and does not log.1. Temporary tables can create temporary indexes, views, triggers2. If you want to drop the session-level staging

OCI: to install the Oracle client, the portability is slightly poor, and theoretically the performance is better Thin: belongs to type4, which is implemented in pure Java and has good portability. Theoretically, the performance is slightly lower. Recommendation: it

If undo damage is unfortunately encountered in Oracle running, the best way is to recover it completely. However, if there is no backup, you can use an unconventional method (using Oracle's hidden parameters ),If undo contains uncommitted transactions at this time, it will cause a little data loss (generally tolerable)

If undo damage is unfortunately encountered in Oracle running, the best way is to recover it completely. However, if there is no backup, you can use an unconventional method (using Oracle's hidden parameters ), if undo contains uncommitted transactions at this time, it will cause a little data loss (generally tolerable

Tags: style blog http java color data Install the database client. This can be downloaded and installed on the Oracle website (download link) Install PL/SQL pl in download Configuring environment variables (This is more important, do not configure Plsql links to the database) The related environment variables that are configured are:variable Name: Oracle_sid variable Value: Ecampus (

MySQL stored procedures(1). FormatFormat created by the MySQL stored procedure: CREATE PROCEDURE procedure name ([process parameters [,...]])[Features ...] Process BodyCase Analysis:ParametersThe parameters of the MySQL stored procedure are used in the definition of stored procedure, there are three kinds of parameter types, in,out,inout, form such as:CREATE PROCEDURE ([[In | Out | INOUT] Parameter name Data class ...])In input parameter: The value that represents the parameter must be specified

Solution. You cannot create a new schema in an Oracle database. To create a schema, you can only create one user, but it is not used to create a schema). When creating a user, create a Schem with the same name as the user name and use it as the default shcema for the user. That is to say, the number of schemas is the

Run the same statement selectcode_idcode on both databases, locate -- here the error with quotation marks is okorderbycode_id a normal, but the other reports an error ORA-01722, the same field type, the same database version, after Run the select code_id code Statement on both databases, code_value name from code_value_t t where code_id like '0 _ 'and class_code = 22 -- if an error is added here, OK order

Execute the same statement on two databases Select code_id code,code_value Name From code_value_t t where code_id like ' 0_ ' and Class_code = ORDER BY code_id A normal, another but the error ORA-01722, the same field type, the same database version, and later found in where the type conversion, if you add single quotes, do not complain, in the error of the database to find data, found that a data is a string type,

Index indexes are generally divided into two types: 1) b-tree (balance-tree), typically used for OLTP (online transaction processing) 2) bitmap, generally used in OLAP (online analysis processing) The following example is used to learn the structure of index: 1. First set up a test table, the index on the test table Sql> CREATE TABLE Test_index as SELECT * from Dba_objects; Table created. Sql> CREATE index T_idx on Test_index (object_id); Index crea

Now explain what "high water level" is: Logical storage structure of Oracle: Tablespace--> segment--> Area--> block Block: is the smallest storage unit, now the standard block size is 8k,oracle every I/O operation

What is the difference between Oracle functions and stored procedures1. The difference between the return value, the function has 1 return values, and the stored procedure is returned by the parameter, can have more or No 2. The difference between the calls, the function can be called directly in the query statement, T

RAM2), when RAM is 2-16GB, swap size is recommended equal to RAM size3), Ram greater than 16GB, swap size recommended 16GB4, large memory environment swap size configuration recommendationsDue to the rapid decline in memory prices, the current production system server memory 256GB, 512GB is no surprise, the author recommends 16-64gb physical memory, swap and phy

been performed. 6, Master table reorganization. 7, materialized view registration failed at the master site. 8. Incorrect conversion of a materialized view log from ROWID to primary key. 9. Manual deletion of sys.slog$ entry for the materialized view. Third, the solution 1. Full volume refresh materialized view exec Dbms_mview.refresh (' SCOTT. User_table ', ' C '); exec Dbms_mview.refresh (' SCOTT. User_table '); 2. Adjust the content of fast and comfortable log SELECT * FROM sys.slog$SELECT

Label:What is the acronym for Oracle's TNS?Transparent Network substrate (transparent net bottom, that is, regardless of the underlying network layer with what protocol for the upper layer of application is transparent, that is,The application layer on the upper level does n