Oracle computing continuous login/working days

Oracle computing continuous login/working days Now there is a report that calculates the number of working days of a user. It is found that the row_number analysis function can perfectly calculate this problem. This SQL statement can solve problems

ORA-12170: TNS: Connection timeout problem solved

ORA-12170: TNS: Connection timeout problem solved The virtual machine can access the database normally, but the physical machine connection to the database appeared "ORA-12170: TNS: Connection timeout", you can solve the problem with the following

New Features of Oracle 12C-Extended Data Types

New Features of Oracle 12C-Extended Data Types New Feature of Oracle 12C-extended data types. In 12c, compared with earlier versions, data types such as VARCHAR2, NAVARCHAR2, and RAW are extended from 4 K and 2 K bytes to 32 K bytes. As long as

New Features of Oracle 12C-online migration of table partitions or subpartitions

New Features of Oracle 12C-online migration of table partitions or subpartitions Oracle 12c: new feature-online migration of table partitions or subpartitions. It is no longer necessary to migrate table partitions or subpartitions to different

Connect to Sybase through Oracle transparent gateway

Connect to Sybase through Oracle transparent gateway The transparent gateway technology proposed by Oracle can be used to interconnect with other types of databases to establish connections between different types of data, which is convenient for

MySQL Character Set details

MySQL Character Set details Character garbled characters are common and frequently asked questions in the database. In view of the fact that at most my level can only be attributed to non-streaming and so on, I am very worried about misleading

Install and start MySQL in Linux

Install and start MySQL in LinuxI. Comparison of various MySQL installation methods In Linux, MySQL has three major installation methods: RPM installation, binary installation, and source code installation. The advantages and disadvantages of the

Configure auto-start for Oracle Database startup

Configure auto-start for Oracle Database startup Every time the database server is restarted, it is necessary to restart the database listening and instances, especially when the server is powered off and restarted and routinely maintained. Can I

MongoDB installation tutorial and simple operations in Ubuntu

MongoDB installation tutorial and simple operations in Ubuntu1 MongoDB First, let's start with a simple definition of MangoDB: MongoDB is a distributed file storage-based database. Written in C ++. It is designed to provide scalable,

Data Types in MySQL

Data Types in MySQL I. char and varchar types The char and varchar types are similar. They are used to store strings, but they are stored differently from the string retrieval method. Char is a fixed-length character type, and varchar is a

Oracle cold Backup Recovery Process memo

Oracle cold Backup Recovery Process memoI. Fault approaching At noon one day, the mains supply was accidentally interrupted, and the UPS Power Supply in the IDC did not take over the power supply due to heavy load. All servers were restarted

Use mysqldump to export a database (table)

Use mysqldump to export a database (table) Mysqldump is used to back up databases or migrate data between different databases. The backup content of mydqldump includes SQL statements used to create and load tables.I. How to Use mysqldump (1) Back up

Install MongoDB in Linux

Install MongoDB in Linux MongoDB provides 32-bit and 64-bit installation packages on Linux. You can download the installation packages from the official website. : Http://www.mongodb.org/downloads Download the installation package and decompress

Reading the return values of Oracle functions using Python

Reading the return values of Oracle functions using Python Create a function in Oracle to return an index table. When we thought that the text could also transmit information, we suddenly came to the inspiration and set the return value to the text

Oracle-ASM installation tutorial

Oracle-ASM installation tutorial The steps for installing the ASM database are a lot different from those for installing RAC. Therefore, we have successfully installed the database based on the ASM management by modifying the installation document

Usage and summary of Oracle Materialized View

Usage and summary of Oracle Materialized View What is a materialized view? Materialized View is a database object that contains query results. It is a local copy of remote data or used to generate a summary table based on the sum of data

Oracle Database File Management

Oracle Database File Management Database files include data files, log files, control files, password files, and parameter files. Management of these files can be seen as the process of adding, deleting, modifying, and querying. 1. Data File

MySQL 5.6.26 uses frm & amp; ibd to restore Data

MySQL 5.6.26 restores data through frm & ibd Create A database bkjia on serverRoot (yoon)> show create table bkjia \ G* *************************** 1. row ***************************Table: bkjiaCreate Table: create table 'bkjia '('Id' int (11)

Setting a large memory page on Linux solves the problem that the kswapd0 process consumes cpusys in transition.

Setting a large memory page on Linux solves the problem that the kswapd0 process consumes cpusys in transition. Environment: SLES11 SP4 + Oracle 11.2.0.4After a new test database was set up and ran for about two days, it was found that a process

Spring integrated MyBatis full instance (SHARE), springmybatis

Spring integrated MyBatis full instance (SHARE), springmybatis To sort out the content in Spring integration MyBatis (Maven + MySQL) 1 and Spring integration MyBatis (Maven + MySQL) 2, prepare a complete example to complete a simple library

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