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  Introduction to postgresql-- Mathematical function

  1. Mathematical functions are mainly used to deal with numerical data, the main mathematical functions are: absolute value function, trigonometric function (including sine function, tangent function, cotangent function, etc.), logarithmic function, random number function and so on. When an error occurs, the mathematical function returns a null value of null. 1.1. Absolutely

  2022-06-01 06:17:11 Views: 282
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  [Mongo] Mongodump and mongorestore backup and restore mongo

  The mongoexport tool in 1.mongoexport Export and mongoimport Import Mongodb can export a collection to a file in JSON format or CSV format. You can specify the exported data items through parameters

  2022-06-01 06:17:11 Views: 289
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  Technology Life Series the Story of me and the data Center-- the first issue

  The name "Xiao y" is a pseudonym that the author thought of temporarily. In fact, it doesn't have any special meaning. Let's just use it to represent a group of unknown IT people who dedicate their youth to various data centers. What Xiao y wants to share with you today is the process of analyzing difficult and complicated diseases. If you are patient,

  2022-06-01 06:17:11 Views: 266
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  Resource limits for profile and limit for resource planning resource_manager_plan

  Profile uses the parameter RESOURCE_LIMITRESOURCE_LIMIT determines whether resource limits are enforced in database

  2022-06-01 06:17:10 Views: 240
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  Separate use of AlwaysOn Service IP and High availability IP (2)

  Scheme 1: the active and standby source IP is used for business access, and the new Nic is bound to IP for AG communication test environment description: AG role hostname network adapter IP address main library TEST-GS-ZHXT1Ethernet010.198.197.167Etherne

  2022-06-01 06:17:06 Views: 292
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  Online education: different genes lead to different destinies

  When the tide comes and goes, online education is immersed in the carnival of capital games; when the tide is gone, many online educators are lost in the "way of money". As a result, the song of ice and fire also began to play in the field of online education. On one side, the elimination of the small and medium-sized online education platform; on the other hand, the size of the head platform.

  2022-06-01 06:17:03 Views: 258
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  Accidents caused by Redis Cluster outage

  Guide: Redis officially claims to support concurrent 110000 read operations and 80 000 write operations. Because of its excellent performance and convenient operation, it is believed that many people have used Redis in their projects. In order to prevent applications from relying too much on Redis services, Redis is only used to enhance applications.

  2022-06-01 06:16:55 Views: 229
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  Mysqldump+mysqlbinlog performs backup and restore

  The server's binary log file consists of events that describe changes to the contents of the database. The server writes these files in binary. To display this content in text format, you can use the mysqlbinlog tool. You can also use mysqlbinlog to display in replication

  2022-06-01 06:16:55 Views: 302
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  UDEV mounts EMC multipath disk

  My storage is EMC. After installing multipath software, [root@chnap-itd64 rules.d] # fdisk-lWARNING: GPT (GUID Partition Table) detected

  2022-06-01 06:16:54 Views: 238
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  The case of Oracle Study-- DBMS_METADATA Package Application

  The case of Oracle Study-- DBMS_METADATA Package Application of DBMS_METADATA:The DBMS_METADATA package provides a way for y

  2022-06-01 06:16:54 Views: 260
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  The most detailed MySQL global lock and table lock in history

  According to the scope of locking, the locks in MySQL can be roughly divided into global locks, table-level locks, and row locks. This article is mainly about MySQL

  2022-06-01 06:16:51 Views: 203
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  Detailed explanation of the output result of MySQL show status command

  Number of connections Aborted_clients terminated because the client did not close the connection correctly. Aborted_connects attempted to connect to the MySQL server and failed Binlog_cache_disk_us.

  2022-06-01 06:16:50 Views: 224
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  Re-indexing of SQL Server 2014

  For the index of a table, if the index size of the table is very large, it is recommended that the index of the table be re-indexed separately. Re-index the entire table: alter index all on Table rebuild with (

  2022-06-01 06:16:50 Views: 237
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  Two new features of Oracle 12c

  1. ALTER DATABASE MOVE DATAFILE can migrate data files to a new path online, and system tablespaces can also be move. SYS@czh29c > alter database move data

  2022-06-01 06:16:50 Views: 270
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  Mysql data is imported into redis cache

  Suppose the table structure is as follows: CREATE TABLE sas_sys_app (user_id varchar (38) DEFAULT NULL,app_id int (11) DEFAULT NULL) ENGIN

  2022-06-01 06:16:50 Views: 301
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  Regular backup of MySQL database under Linux platform

  Write a MySQL backup script according to the requirements, which are as follows: make a daily backup of the specified database and save the backup files for one week, and automatically delete the files beyond one week. 1. Create shell script [root@server18 mysql] $mkdir-p /

  2022-06-01 06:16:49 Views: 224
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  Create statements that automatically list missing indexes on tmstamp

  SELECT o. Name username (o.uid), 'ALTER TABLE [dbo].' +'['+ object_name (co.id) / * tbname*/+']'+ 'ADD CONS

  2022-06-01 06:16:49 Views: 220
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  MySQL 5.7MGR single Master method for determining Master Node

  Our bank MGR will be online at the end of the year. We have to look at the official documents every day to study, do tests, and insist on writing a small knowledge point every day. Do you want to study together? MySQL 5.7 MGR single master determines which master node is. We can judge by the member ID, and then combine with read_onl.

  2022-06-01 06:16:49 Views: 223
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  Efficiency comparison between merge into and update

  The efficiency comparison between merge into and update used to consider that merge into is only convenient to use in certain situations, but today it has been found that merge into has such a big improvement over update in updating data.

  2022-06-01 06:16:49 Views: 214
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  Mysql architecture

  I. MySQL hierarchical architecture 1. The link layer deals with network links and network authentication of links. -View link permissions Click (here) to collapse or open mysql > select user,host from mysql.user\ Ghost 2

  2022-06-01 06:16:44 Views: 259