Oracle

The status and usage of the undo segments and zones of the undo series learn only one thing about the undo tablespace: Save the old values. In AUM, segments are automatically generated, zones are automatically allocated and recycled, and they are

The following describes the steps to manually create a database in Oracle: 1. Confirm the new database name and Instance name; 2. Confirm the authentication method of the database administrator; 3. Create an initialization parameter file;

Full Learning Guide for pl/SQL 3 large loops 1 loop overview each loop consists of two parts: the loop boundary and the loop body. The cyclic boundary consists of pl/SQL reserved words. Code located outside the loop body should not know the internal

Today, I happened to find an oracle client graphical management and development tool. When I saw this interface, I found this tool online, after reading Baidu encyclopedia, I was surprised to find that this product was fully supported by many

Oracle note (5) single-row functions although each database supports SQL statements, each database also has the operation functions supported by each database. These are single-row functions, if you want to develop a database, you need to learn more

A function wmsys in oracle 10g and 11g. wmsys. the function of wm_concat is to merge multiple rows into one row. For example, if A person buys three stocks A, B, and C, we will record three data records normally, now we want to display the stock of

The Association of SQL tuning and shared pool structures introduces three types of computer resources that affect performance: Memory, CPU, and I/O. By adjusting SGA and PGA to make full use of physical MEMORY, making full use of CPU through

What should I do if oracle forgets the password of sys/system/scott? I. Forget the login password of a user other than SYS and SYSTEM. Log On with SYS (or SYSTEM) USER: conn sys/PASS_WORD as sysdba; use the following statement to modify the USER's

Oracle job description 1. set the initialization parameter job_queue_processes SQL> alter system set job_queue_processes = n; (n> 0) job_queue_processes. The maximum value is 1000. view the SQL> select name of the job queue background process,

Step 1: Try to delete a process in sqlplus by running the SQL command. If the process can be deleted successfully, everything is fine! However, if you want to delete a session with a deadlock through a command line or using an oracle management tool,

When debugging the Oracle EM service on the local machine, the following interface is often displayed: "the security certificate of this website is faulty ". You often directly click "continue to browse this website (not recommended)" to enter the

The difference between user_tab_columns and user_tab_cols in oracle depends on the oracle metadata create or replace view sys. user_tab_columns asselect TABLE_NAME, COLUMN_NAME, DATA_TYPE, direction, direction, DATA_LENGTH, DATA_PRECISION,

Oracle Regular Expression functions: regexp_like, regexp_substr, regexp_instr, regexp_replace SQL code Oracle can't do without these four functions: 1. Regexp_like 2. Regexp_substr 3. Regexp_instr 4. Regexp_replace www.2cto.com can be used to guess

The solution for physically deleting the DBF File causes the database to fail to work properly. Because the space on the E disk where the local oracle installation is located is insufficient, the unused data file E is: \ ORACLE \ PRODUCT \ 10.2.0 \

A solution that prompts "ORA-01788: This query block requires a connect by clause" when creating a remote materialized view on Oracle 11g maps a table on the remote server to a local materialized view, use the following statement: www.2cto.com ----

How to Understand the latch and enqueue lock problems in Oracle databases. Everyone may have different ideas and different starting points, what is the cause of lock & latch. Then explain the nature of lock & latch from different perspectives.

TSPITR (Recovery of Tablespace Based on TIme points) TSPITR (Tablespace Point-In-TIme Recovery) Introduction to www.2cto.com TSPITR (Recovery of Tablespace TIme points) it is used to restore one or more tablespaces to a previous time point, while

When analyzing the event enq TX row lock contention Analysis in the Oracle database performance report AWRRPT, it is found that the top 5 tasks waiting for the event first are enq: TX-row lock contention. Www.2cto.com Rpt code Top 5 Timed Events

TABLESPACE is read only, and DML and DDL operations can be performed (some examples) create a test table space create tablespace tablespacereadonly datafile '/u02/oradata/orcl/tablespacereadonly01.dbf' size 1 m autoextend on next 1 m maxsize

Oracle dblink creation error: ORA-01017, ORA-02063 solution 1, create dblink original statement: www.2cto.com create public database link db_lsxyconnect to lsxy identified by lsxyusing '(DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)