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  1.1access database

  Data model classification: a. Hierarchical model: disadvantage of organization chart: uncertainty. b. Mesh model: disadvantages: uncertainty. c. Relational model: a model that uses a two-dimensional table structure to represent the relationship between entities.

  2022-06-01 13:58:55 Views: 258
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  MySQL (3)-Integrity constraints for tables

  Table integrity constraints: common table constraints used to ensure data integrity are: PRIMARY KEY (contending primary key), FOREIGN KEY (FK foreign key), NOT NULL, UNIQUE KEY (unique key)

  2022-06-01 13:58:25 Views: 214
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  Tar, cpio package decompression. Shell script for,while,until loop. Rpm package Management, select Loop menu, function function,yum

  Tartar-cf path + file name followed by .tar + path to create archive compression tar cf / testdir/etc.tar / etc/tar cvf can view the decompression process tar tvf preview role tar xvf

  2022-06-01 13:58:17 Views: 267
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  Redis common commands

  1.redis batch operation cat insert_redis.txt | redis-cli-h 10.24.253.1-p 7389-- pipe

  2022-06-01 13:58:16 Views: 273
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  ORACLE 11.2.0.4 180116 PSU HP Anteng 11.31 installation

  27282436 = 27107360 (PSU) + 26925532 (OJVM) 0. To avoid conflicts with the system background job when installing the patch when running the data dictionary script, check AutoTask, and if there is an Enabled, Disa first

  2022-06-01 13:58:16 Views: 206
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  Invalid Listener in oracle

  When I was working today, I suddenly reported an error when I was operating to delete all the tables under the oracle user, and then I couldn't link with plsql. Tried all kinds of methods, but to no avail. Finally decided to restart the oracle service. I logged in to oracle's server through crt.

  2022-06-01 13:58:16 Views: 241
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  OPatch-Where Can I Find the Latest Version of OPatch

  Look up the opatch patch on mos and find the following document. I find it useful to post it. I hope it will be helpful to the family. Original document ID 224346.1APPLIES TO:Oracle Universal Installer-Vers

  2022-06-01 13:58:10 Views: 295
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  How to patch Oracle

  1. Current environment platform version mode Linux 32bitOracle 10.2.0.3 single instance 2, purpose repair CPU bug namely Patch 7369190: 3, download the patch, log on to the metalink website to find the corresponding patch 4, install

  2022-06-01 13:58:01 Views: 283
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  Integrate vsftp+pam+mysql- to centrally manage the virtual account of ftp

  First of all, the basic principles of integrating vsftp+pam+mysql- 's virtual account for centralized management of ftp are briefly introduced: there are three types of users in vsftp, namely, anonymous users, system users and virtual users. In a sense, anonymous users are also system users, only one of the system users.

  2022-06-01 13:58:00 Views: 213
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  Mongodb log slicing

  #! / bin/bashkillall-SIGUSR1 mongod# will automatically generate a file like / data/mongo/mongo/log/mongod.log.2016-01-28T06-06-59 and then repeat it

  2022-06-01 13:57:54 Views: 234
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  The service cannot be started after upgrading from SQL SERVER 2008 to SP4

  In order to improve the performance and security of SQL, No. 2 upgraded the SQL 2008 SP4 patch to the customer, and everything went smoothly during the upgrade process. However, after restarting the server, it was found that the SQL service could not be started, and the event log led to this error: due to the upgrade step 'sqlagent100_msdb_

  2022-06-01 13:57:54 Views: 206
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  Oracle Clusterware introduction

  Oracle Clusterware consists of two separate stacks: the Cluster Ready Service (CRS) daemon (crsd) and Oracle High Availability Service

  2022-06-01 13:57:36 Views: 271
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  Three-tier architecture

  The responsibility of 1.UI (User Interface) layer is to display and collect data, and the results of data collection are usually submitted to BL layer for processing by Entity object. Service Interface side

  2022-06-01 13:57:36 Views: 295
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  [actual combat of python project] BBS Forum (1) build project framework

  First, preparatory work: Windows7-64-bit python 2.7mysql version: 5.7.12django 1.9.5IDE development tools: pycharm 2.7.2.The design of the table structure mainly involves the following points: 1. ER of the table

  2022-06-01 13:57:24 Views: 257
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  Separation of read and write of MySQL by MyCAT

  Before the emergence of MySQL middleware, for the MySQL master-slave cluster, if you want to achieve its read-write separation, it is usually implemented on the program side, which brings a problem, that is, the coupling between the database and the program is too high. If the address of my database is changed, then the program side will have to fix it accordingly.

  2022-06-01 13:57:21 Views: 301
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  12c adg add data file error processing ORA-01111

  First, describe 12c ADGrhel 7.02. phenomenon, processing process 1. Add data files to the main library and report errors in the standby library. Beginning Standby Crash Recovery.Serial Media Recovery s

  2022-06-01 13:57:13 Views: 226
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  Talking about backup and restore of SQLServer Database

  In life, the database administrator is most worried about database paralysis, resulting in data loss, any data loss will cause very serious consequences, so we need to back up the data in order to protect and restore the data more effectively. Generally speaking, the loss of data mainly includes several categories: 1.

  2022-06-01 13:57:13 Views: 231
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  Linux installation Mongodb4.0 and remote configuration

  1. Download and install the official website address: https://www.mongodb.com/download-center?jmp=nav#community what you download here is the community version of linux 7: decompress tar zxvf m

  2022-06-01 13:57:10 Views: 287
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  Create unique unique constraints in the database

  For the requirements in the recent project, determine the only piece of data that seems to have been encountered, forgotten, and now record it. Implementing a unique constraint can also be a unique that is not a primary key. Unique constraints in oracle are used to ensure that a certain class in a table, or a certain class in a table, is not duplicated.

  2022-06-01 13:57:09 Views: 247
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  Problems encountered by 12c datagurad in creating temporary tablespaces

  1. Add temporary file SQL > create temporary tablespace temp_1 tempfile'+ datadg' size 10m to the main library Tablespace created.SQL

  2022-06-01 13:57:09 Views: 220