Oracle

AUTOTRACE for Oracle performance analysis tools is one of the most common performance analysis tools. It is used to view the execution process and resource consumption of SQL statements. The SP2-0618: The session identifier cannot be found. Enable

Use sum to convert rows and columns. The original table www.2cto.com is expected to display each IDX_CODE column in the table in the query results. The result table is as follows: create table test (IDX_DATA_ID NUMBER (12) not null, org_no NUMBER (2)

PL/SQL attribute type description PL/SQL two attribute types Description: www.2cto.com % type reference the type of a variable or database column to declare the variable % rowtype to indicate the record type of a row in the table. The www.2cto.com

Periodically execute Oracle job tasks to create a data table and create a process so that the process runs once a minute. 1) create a table. SQL> create table test (mydate date); Table created. (2) create a custom process. Www.2cto.com SQL> create

Oracle: bitmap index and deadlock-1 B-tree index are more suitable for indexing the OLTP environment of Dynamic tables, while bitmap index is more suitable for using complex query data warehouse environments in Large static tables. Bitmap index

In-depth understanding of Oracle Table (3): three major table join Methods: Nested loop join and Sort merge join in-depth understanding of Oracle table (1): ORDERED and USE_NL http://www.bkjia.com/database/201301/186604.html In-depth understanding

Oracle has the following requirements to obtain the date after a certain interval: 1) display the time after the current 1.5 days. 2) display the time six hours later. 3) display the time six months later. 4) display the time after the current 10

The non-update principle in Oracle Database Design when adding data, if the new logic involves the original information, try not to update the data. Www.2cto.com. What kind of situation will there be such a problem? For example, a user places an

When Oracle PL/SQL compares the two fields to determine whether they are the same in Oracle PL/SQL to determine whether the two fields are equal or not, it often appears that the field values are obviously not equal (a blank, is not null), but TRUE

In linux, emca re-build EM in oracle. If you change the machine name, you can re-create EM. Generally, you do not need to re-configure emca to re-create EM [oracle @ dev ~]. $ Cd/u01/app/oracle/product/11.2.0/dbhome_1/bin www.2cto.com recreate an EM

A Method of dynamically initializing numbers often needs to initialize some data, and some regular numbers need to be filled according to the actual situation, such as fixed length and several parts, the most common example is the first digit,

For some very useful Oracle SQL prerequisites, open the windows command line window. 1. Open SQLPLUSC> sqlplus/nolog2. Connect to www.2cto.com SQL> connect user/password @ SID or SQL> connect user/password @ localhost (IP Address): 1521/SID3. Query

Transaction locks in Oracle (locked tables and locked sessions) Today I learned another trick to view the transaction locks caused by abnormal session exits in Oracle Database: 1. view the locked table SELECT B. owner, B. object_name,. session_id,.

Explain the following example of an Oracle execution plan: www.2cto.com [html] SQL> explain plan for 2 select. name, B. name 3 from t1 a, t2 B 4 where. id = B. id 5 and. id = '1'; Explained. SQL> set lines 200 SQL> set pagesize 0 SQL> select * from

1. create and manage database user accounts 1. Each database user account has the following items: (1) Unique User name: it cannot exceed 30 bytes and cannot contain special Pearl letters, it must start with a letter. (2) Verification Method:

The Oracle log file is accidentally deleted to solve the problem of the Directory www.2cto.com 1... 2 1.1 accidentally deleting the log file... 2 1.2 Oracle cannot connect... 2. General solution... 2 2.1 SYS log on to the database... 2. 2.2 shut

[Oracle learning] The UTL_FILE package analysis package of ORACLE UTL_FIle is used to read and write files in the operating system, provided that the Directory object and authorization are created first. Then you can use the types, procedures, and

Precautions for oracle Import and Export: The oracle Import and Export solution is the main melody of backup and reply, not dba. There is not much research on data import and export, and there is only a little bit of experience in the use process,

For the stored procedure of displaying the execution plan in the Oracle index access mode, see http://www.bkjia.com/database/201303/192688.html (1) unique index scan of index unique scan. A single match is performed for a unique index. In a unique

Several result set operation commands that are well known for the operation information of oracle result set are tested in detail today. Some problems are found and the test preparation is recorded. Www.2cto.com suppose we have a table Student,