Notes on common Oracle commands and common oracle commands

Notes on common Oracle commands and common oracle commands Login without a password: sys as sysdba View all current databases: select */name from v $ database; View the current database connection user: show user View All Tables of the

Java Redis and javaredis

Java Redis and javaredis The related concepts of Redis are not introduced. You can also understand Memcached first, and then compare the differences between the two, so you will have an overall impression. The server usually chooses Linux, and

ORA-01591: lock held by in-doubt distributed transaction troubleshooting, ora-01591in-doubt

ORA-01591: lock held by in-doubt distributed transaction troubleshooting, ora-01591in-doubt Oracle errors occurred when running the batch data program yesterday: $ Tail-f INDB_ERROR_8.LOG[Time] 2014-12-01 04: 10: 31: activeAccountDeposit in oracle

[Practice] sphinx starts to close the management script and sphinx script

[Practice] sphinx starts to close the management script and sphinx script #! /Bin/sh #/usr/local/sphinx/bin/# ocpyang@126.comsphinx _ pidfile =/usr/local/sphfile/var/log/searchd. pidif [-e "$ {sphinx_pidfile}"]; thensphinx_active = 1 # runing # echo

SQL and SQL tutorials

SQL and SQL tutorials /* To create a foreign key in a new table */create table Sales. tempSalesReason (TempID int not null, Name nvarchar (50), CONSTRAINT PK_TempSales primary key nonclustered (TempID), CONSTRAINT FK_TempSales_SalesReason foreign

Use pt-heartbeat to monitor master-slave replication latency and pt-heartbeat master-slave

Use pt-heartbeat to monitor master-slave replication latency and pt-heartbeat master-slave MySQL master-slave replication is an important part of the MySQL high-availability architecture. It can be used to achieve load balancing, high availability

Common Redis commands-INFO, MONITOR, SLOWLOG, and redisslowlog

Common Redis commands-INFO, MONITOR, SLOWLOG, and redisslowlog Author: zhanhailiang Date: 2014-12-02 1. INFO The info command returns information about the server, including: Server: General information about the Redis server Clients: Client

SQL table join diagram, SQL table diagram

SQL table join diagram, SQL table diagram You can see through the figure below Multi-table queries are classified into internal and external connections. Outer join is divided into left join or left outer join, right join or right outer join, and

How to Use navicat for mysql to connect to a local database and import data files

How to Use navicat for mysql to connect to a local database and import data files How to Use navicat for mysql to connect to a local database and import data files1. Introduction Navicat for mysql is a database management tool designed to simplify,

Transact-SQL programming, transactsql

Transact-SQL programming, transactsqlTransact-SQL programmingTransact-SQL(1) Data Definition Language (DDL)Create tabl/* create Table */Alter table/* Modify table */Drop table/* Delete table */(2) data manipulation language (DML)Select/* retrieve

SQLite summary, sqlite

SQLite summary, sqliteZookeeper Generally, the static data type is fixed, while SQLite uses the dynamic data type, which is automatically determined based on the stored value. SQLite has the following five data types: 1. NULL: NULL.2. INTEGER: A

JDBC database programming and jdbc programming books

JDBC database programming and jdbc programming books **************************************** ****************************************************** Original works, from the "Xiaofeng residual month xj" blog, welcome to reprint, reprint please be

Mysql batch imports text data into the database C language (c api), mysqlapi

Mysql batch imports text data into the database C language (c api), mysqlapi In fact, the principle is very simple. I think everyone should have read the article I wrote (a code learns to operate databases in C) on linux, the basic student

The obsolete maintenance command crs _ *, 12ccrs _ in Oracle 12c RAC _

The obsolete maintenance command crs _ *, 12ccrs _ in Oracle 12c RAC _   Crs_stat is commonly used in Oracle 10g and 11g RAC to monitor the running status of RAC. However, the crs_stat display is incomplete, so we will perform a secondary

Installation manual for a single Oracle 12c instance and 12c installation manual for linux 6.4

Installation manual for a single Oracle 12c instance and 12c installation manual for linux 6.4  I. Preparations  1.1 install the required RPM package   Binutils-2.20.51.0.2-5.11.el6 (x86_64) Glibc-2.12-1.7.el6 (x86_64) Libgcc-4.4.4-13.el6

Oracle unlocked and blocked accounts

Oracle unlocked and blocked accounts (1) We have a management account in the last step when installing Oracle, which can unlock the account we need, but many people sometimes do not unlock it, Next, we will study how to use the command line to

The JDBC Insert statement is inserted into the Oracle database and the primary key of the returned data is jdbcoracle.

The JDBC Insert statement is inserted into the Oracle database and the primary key of the returned data is jdbcoracle. Table Structure: create table test( id varchar2(32) primary key, name varchar2(32)); Import java. SQL. connection; import

Add, delete, modify, and query objects and Methods

Add, delete, modify, and query objects and Methods Recently, I have been working with my friends on data centers. I am responsible for layer D. When I re-write sqlhelper, I found that the query operation uses the SqlDataAdapter object. I remember

Mongodb 1 quick start deployment

Mongodb 1 quick start deployment Quick Start deployment of Mongodb 1. Download mongdb and unzip vue I downloaded the windows zip package here.     2. decompress the package Rename mongodb     3. Create data, log, and repair files in the

Optimization of SQL statements in hybrid MySQL, effectivemysql

Optimization of SQL statements in hybrid MySQL, effectivemysqlWe recommend that you optimize SQL statements in objective MySQL.This article mainly explains how to analyze SQL Performance, indexing principles, how to create appropriate indexes, and

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