Oracle

gets the execution plan6kind of Method1. explain plan for acquisition;2. set autotrace on ;3. Statistics_level=all;4. Direct Access via dbms_xplan.display_cursor input sql_id parameters5. 10046 trace trace6. Awrsqrpt.sqlApplicable occasions Analysis1

64-bit win7 with PL/SQL, often meet "Could not load" ... \bin\oci.dll "" This error, I checked the information because PL/SQL only supports 32-bit OS, The workaround is to load an additional Oci.dll file with the following actions:STEP1: Download

Login without password: sqlplus/as sysdbaView all current databases: select name from V$database;View current database connection User: Show userView all tables for the current user: Select table_name from All_tables;View table structure: DESC table

has been using MySQL, has recently switched to Oracle, Oracle's first step is the JDBC connectionThe first step: Download the jar package, I use the oracle11g is Oracle6.jarStep two: Load the jar packageThen find the downloaded Jar location.Step

1. Physical structure (composed of control files, data files, redo log files, parameter files, archive files, password files)Control files: Contains necessary information to maintain and verify database integrity, for example, control files are used

What we will learn in this chapter are: How to use Set operators, which combine the rows returned by two or more queries Using the Translate function 1. Using the SET operator Operator Description

Design of the databaseThe process of software development:Project--Requirements analysis--design, detailed design----implementation---maintenance[including database design]Through demand analysis, we can extract the "entity classes" in the key

1. Check the status of the main library:Sql> SELECT switchover_status from V$database;Switchover_status--------------------To STANDBY2. Set the main library to standby roleALTER DATABASE commit to switchover to physical standby;Shutdown

In many cases, we will need to insert a large amount of data into a table, and hope to complete the work in as short a time as possible, here, and share with you some of my usual experience in doing a lot of data insert.Premise: Before making the

1.Create userSql>--For example, create a user named Xiaoming with a password of A123sql> Create user xiaomingidentified by A123;The user has created.Sql> Show UserUSER is "SYS"2.granting permissions to usersSql>--grant permissions to User

Oracle database is the world's most powerful database management software, the functional system is particularly large. It is necessary for us to learn about every part of it, and then to effectively grasp it from a global perspective. We will focus

Both of these methods can be used in Sqlplus:EXEC pro_name (parameter 1:);Call Pro_name (parameter 1:);Difference:1. But exec is a sqlplus command and can only be used in sqlplus; call is a SQL command with no restrictions.2. When the stored

drop table if exists sequence;CREATE TABLE Sequence (Seq_name VARCHAR () not NULL,Current_val INT not NULL,Increment_val INT not NULL DEFAULT 1,PRIMARY KEY (Seq_name));Drop function if exists currval;Create function Currval (V_seq_name VARCHAR

Ora-01033:oracle initialization or shutdown in progress practical processing method, this problem is usually due to abnormal computer shutdown, we can use the following method to find out that the file is corrupted, and then repair the file.Sql*plus:

ObjectiveUnder the IoE wave, many of the big companies ' antique-grade systems are still using the IOE device. New owners some years of systems are using Oracle database, in order to save time, the new architecture of the business directly through

A lot of people must be like me. Due to work needs, the development environment needs to be foreign languageNext, I'll talk to you about my handling of Oracle garbled.My Windows environment is the processing order of Japanese1. Modifying environment

today, at dinner, my friend's database has a problem, CPU occupancy is 97%, when I see this problem, I think of the SQL is probably the cause of this problem, because can't help eating, temporarily did not help him to see this problem, this is my

Sql> Select COUNT (*) from V$session #连接数Sql> Select Count (*) from v$session where status= ' ACTIVE ' #并发连接数Sql> Show parameter Processes #最大连接Process: This parameter limits the number of operating system processes that can connect to the SGA (or

This article mainly describes the Oracle delete table, the field before the Judge table, the field is related to the existence of data, the need for friends can refer to the followingIn Oracle, if you delete a nonexistent table, such as "DROP table

Features of temporary tables:(1). Oracle allocates storage space for users only when they add data to the table. (2). allocate space for temporary tables from temporary table spaces , avoiding storage space with data from persistent objects;