Database Administrator

Basic Information Database Version: Oracle 10.2.0.4 Number of nodes: 2 1. Stop all processes related to oracle, including databases, asm, node application, and crs.1.1 close all processes, Crs_stop-all 2.2 shut down the crs background process and

To export some data from Oracle to a text file (flatfile), due to the large data table, the export fails when toad is used. In fact, the memory overflow occurs. It seems that we should use Oracle's own command to complete it. First, prepare the

I have never seen such writing before, such Select * from t_spolicy d, V_POLICYEMPLOYEE g where d. policyno = g. policyno (+) Only by checking relevant information can we find that this method is another form of external connection, which is

The process is as follows: SQL> show user;USER is "SYS"SQL> create user test identified by test; User created. SQL> create table test. t (id int );Create table test. t (id int)*ERROR at line 1:ORA-01950: no privileges on tablespace 'users' Cause:

Requirements: Match the mobile phone number. The first digit can be "+", but not "+". The following digits are all numbers, for example: + 861359415665 8613659558555 1356856455 Are valid.   + Aa156945555 Aa1359556666 Aaddssdfdfsd Are

If the not null restriction is added when VARRAY is defined, the element of this VARRAY cannot be NULL. Definition: Create or replace type integer_varrayAs varray (5) of integer not null;/ Then there is a PLSQL block as follows: DECLARE -- Declare

1. Create ASM FRA DGSelect PATH, MOUNT_STATUS, HEADER_STATUS, MODE_STATUS, STATE from V $ ASM_DISK;Create diskgroup fra external redundancy disk '/dev/mapper/mpath50p1 ';If you use asmlib to manage disks, use ORCL: FRADATA02 Create diskgroup fra2

Set echo on ------- set whether to display the statement when running the command Set feedback on ------- set "XX rows selected" Set colsep | ------- set the delimiter between a column and a column Set pagesize 10 ------- set the number of rows

31. Which two statements are true regarding the database in ARCHIVELOG mode? (Choose two .) A) You have to shut down the database to perform the backups. B) Archiving information is written to the data files and redo log files. C) You can perform

You do not need to add content in server. xml or web. xml.First:Create a file context. xml under the project META-INFJava code "Jdbc/myOracle"Auth ="Container" Type ="Oracle. jdbc. pool. OracleDataSource"Factory ="Oracle. jdbc. pool.

The most basic method is to create one master node and one or more slave nodes. Each slave node must know the address of the master node.Start the master server:Java code Mongod -- master Start the slave server, where master_address is the

In the project test, the tester finds that when the query result list is displayed on multiple pages, some data is repeatedly displayed on several pages, and some are not displayed at one time. After analyzing the SQL, the original problem lies in

NoSQL has many advantages, Just 1. store any objects, images, files, and so on. 2. The same object storage is not restricted. That's enough for me to hug. So, go to ruby and check that there is a feeling that the consumer ID will gradually replace

Statement for querying deadlock information in Oracle: Select a. owner, A. object_name, B. xidusn, B. xidslot, B. xidsqn, B. session_id, B. oracle_username, B. OS _user_name, B. process, B. locked_mode, C. machine, C. status, C. server,

Recently, I was working on a Linux system. Based on portability considerations (MySQL, 0 racle, and DB may be used in the system database), I used ODBC to connect to the database. Test Database: MySQL Garbled characters occur when data is

Oracle does not have a field type similar to the field type Automatically numbered in Acces. Therefore, it is quite troublesome to use a field to automatically add value in oracle. Here we provide you with a method to use the sequence, the following

1. view the data in the first three rows. If the column alias does not existASClause. The derived column is named 2, which indicates that it is the second column in The result set. Db2 => select name, salary + comm from staff fetch first 3 rows

Common sqlplus commandsWhen an SQL statement is entered, the SQL statement is in the cache of SQLPLUS. The cache is small and only one SQL statement is allowed. When the next SQL statement is entered, the previous SQL statement is overwritten.To

Union/union all operation: combines query results into one result. union all does not filter duplicates. SELECTProduct_idFROMOrder_items UNION SELECTProduct_idFROMInventories; SELECTLocation_idFROMLocations UNION ALL

When I read the Mysql manual again today, I see a function concatenation field that is ignored at ordinary times. In fact, it is simple to use mysql functions to process strings. The calculated field is usually used, but the spliced field is ignored.