Database Administrator

1. About openrowset and opendatasourceMaybe this technique has already been used, that is, to use openrowset to send local commands. Generally, our usage is (including the MSDN columns) as follows:Select * from openrowset ('sqloledb', 'myserver';

1. To optimize the query, try to avoid full table scanning. First, consider creating an index on the columns involved in where and order.2. Try to avoid null value determination on the field in the where clause. Otherwise, the engine will discard

Su-mysql-c "mysqld_safe-skip-name-resolve-open-files-limit = 4096 &"Cd/usr/local/mysql/bin/Mysqldump-u username-p password-databases Database Name>/backdata/ddd07-11-15. SQLMysqldump-databases zt>/data/ok1.

1 syntax GREATEST (expr_1, expr_2,... expr_n)2 Description The GREATEST (expr_1, expr_2,... expr_n) function returns the maximum number from the expressions (columns, constants, and calculation values) expr_1, expr_2,... expr_n, and so on. During

 Add and Update price list lines-- Purpose: to add row information based on the existing price list Header-- Restriction: this api has some problems. If the header information is forcibly added, there will be many problems. Therefore, this example

MySQL backup methods I have been wanting to write some blogs recently, but I don't know what to write. I feel that my recent knowledge has not increased. Today I think of a blog that can be written. I used to back up MySQL based on the data folder,

12. You need to produce a report where each customer's credit limit has been incremented by $1000. InThe output, the customer's last name shoshould have the heading Name and the incremented credit limitShocould be labeled New Credit Limit. The

There are two types of Standby databases:1, Physical standby databaseBlock-for-block basisThe physically identical with the primary databaseUser recovery technology2. Logical standby databaseShares the same schema definition withe the primary

Virtual Machine: VMware 9.0 OS: Window Server 2003 Enterprise (32 Bit) Clusterware: 10.2.0.1-> 10.2.0.4 Database: 10.2.0.1-> 10.2.0.5 I used to get used to building rac in the Linu environment. I tried to play it on Windows for the first time

Practical Functions DECODE Syntax: DECODE (value, if1, then1, if2, then2, if3, then3,... else) Value represents any column of any type in a table or any result obtained through computation. When each value is tested, if the value is if1, the result

PostgreSQL supports arrays, but does not have a function to sort internal data elements. Today I wrote one with PLPGSQL and PLPYTHONU respectively.Example Table Structure: t_girl=# \d test_array; Table "ytt.test_array"

 1: Obtain the start time and end time of the week. Start Time of the week, starting from Monday. SQL> SELECT TRUNC (TO_DATE ('2017-11-25 10:31:11 ', 'yyyy-MM-DD HH24: MI: ss'), 'D') + 1 ASA FROM DUAL; A -----------   End Time of the week,

Today is. the following error occurs when copying data: RMAN-05537: DUPLICATE without TARGET connection when auxiliary instance is started with spfile cannot use SPFILE clause The procedure is as follows: [oracle@dg1 dbs]$ rman target sys/root@dg1

DataGridViewControls are highly configurable and scalable. It provides a large number of attributes, methods, and events that can be used to customize the appearance and behavior of the control. The following example shows how to add, delete, modify,

I recently used statspack on a 8i production database of the customer and found that alert has an error: Mon Jun 16 13:17:52 2014Errors in file/oracle/8.1.7/admin/prod/bdump/snp0_96626_prod.trc:ORA-12012: error on auto execute of job 304ORA-01631:

Master xinju database-summer public welfare experience course 1. Do not miss out on DBAs (students) 1. the largest and most professional ORACLE software service provider in China: the organizer of this event, Shanghai xinju Network Technology Co.,

More and more problems have been found recently. Both in self-learning and software problems have made me feel that there are still many problems that need our efforts, in the near future, we can better solve the problem. Now let me talk about the

I. Overview In Oracle block programming (begin series), because it does not support the form of select... from... returned result set, results can only be returned in the form of output parameters. As a structure that encapsulates the result set

Oracle ASM (Automatic Storage Management System) is a database file storage management system officially provided by oracle. Compared with other file storage systems, AMS has specific advantages in load balancing, performance optimization, and

Step 1: connect to the database Development Environment: Ubuntu Modify settings. py DATABASES = {'Default ':{'Engine': 'django. db. backends. mysql', & nbsp;'Name': 'blog ', & nbsp;& Nbsp;'User': 'root ','Password': 'root ','Host': '2017. 0.0.1 ', &