Learning notes for five types of Redis objects and five learning notes for redis

Learning notes for five types of Redis objects and five learning notes for redis When using Redis, we directly access String, List, Hash, and Set objects ), sortedSet. Basic commands include String (get set) List (lpush rpush lpop rpop lrange) Hash (

Forcibly obtain the next value of the sequence/current value (oracle function), oracle Function

Forcibly obtain the next value of the sequence/current value (oracle function), oracle Function Http://blog.csdn.net/qq525099302/article/details/47146393-For more information about how to use a function to obtain the sequence value, see here. --

High Table space usage in SYSAUX

High Table space usage in SYSAUX The SYSAUX tablespace is an auxiliary tablespace of the system tablespace. It mainly stores EM-related content and table statistics, AWR snapshots, and audit information, if SYSAUX tablespace is not configured by

Data row-to-column instance and data column instance

Data row-to-column instance and data column instance During system development, data statistics are often performed and data rows are converted into columns, for example, the table representation. However, the data presented in the database is often

Redis synchronization fails because of redis synchronization failure.

Redis synchronization fails because of redis synchronization failure. Today, I got the Redis master-slave synchronization. The setting method is actually very simple, but the crash is caused by an inexplicable problem that cannot be synchronized

Oracle Data Accesses other Oracle databases.

Oracle Data Accesses other Oracle databases. Create a database link in the local oracle databaseDrop database link mydblink;Create database link mydblink connect to zszq identified by "zszq" using '192. 168.0.175: 192/orcl '; SQL> DROP DATABASE LINK

Modify the table name and field name in an SQL statement.

Modify the table name and field name in an SQL statement.   Today, we have a temporary task to modify the database table name and field name in the production environment. In the past, the field names of the table names to be modified were all in

Generic + polymorphism, Polymorphism

Generic + polymorphism, Polymorphism Q: Generic T is usually a placeholder for a class. But what mechanism does this "T" use to get the correct results? A: generics blossom on polymorphism. To give a simple example, the average height of men and

Fault case: slave latency is high, and slave latency is

Fault case: slave latency is high, and slave latency is Case 1: lvm model. After the slave database is created, the qps of the master database is 2 w and the slave database is more than 6 K. The latency increases slowly from a certain point in time

Mybatis + Oracle batch processing, mybatisoracle

Mybatis + Oracle batch processing, mybatisoracle 1. Batch insert In many cases, data insertion is involved. The MySQL dynamic SQL statement can solve this problem well. Of course, oracle has provided the batch insert statement: insert into students

String is split into multiple rows of data (oracle function), multiple rows of oracle

String is split into multiple rows of data (oracle function), multiple rows of oracle Address-http://blog.csdn.net/qq525099302/article/details/47146537 -- Create a split type (used in the function) create or replace type strsplit_type as table of

MySQL database operation commands and mysql commands

MySQL database operation commands and mysql commands Note: MySQL databases are case-insensitive. 1. Create a database:Create database Thinkgamer; 2. delete a database:Drop database Thinkgamer; 3. Select a database:Use Thinkgamer; 4. Create a data

How to ignore the title of the first row of an oracle External table?

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In windows, mysql5.6.20 uses mysqldumpslow. pl To analyze slow logs and mysqldumpslow

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Qt implements cascading deletion of sqlite3 and qt implements sqlite3

Qt implements cascading deletion of sqlite3 and qt implements sqlite31. there are two required tables: the barcode table and the product details table. The rfid in the barcode table is the rfid foreign key in the product table, you must delete the

Redis configuration cluster, redis Cluster

Redis configuration cluster, redis ClusterConfigure the cluster configuration environment in redis Environment centos 6.6 redis 3.0.2 For convenience, copy three copies of the redis environment under a folder, with the suffix representing the

Hive count distinct, hivedistinct

Hive count distinct, hivedistinct Select count (distinct user_id) from dm_user where ds = 20150701; With the disticnt function, all data is shuffled to only one CER, causing serious data skew of reducer. After optimization Set mapred. reduce.

Configure master-slave replication for redis, and configure master-slave for redis

Configure master-slave replication for redis, and configure master-slave for redisConfigure master-slave replication for redis master-slave Replication ./Redis-server command. If no parameter is appended, it starts the redis service according to the

Create/delete a PostgreSQL database.

Create/delete a PostgreSQL database.Method 1-system commandsSudo su-postgres # Switch to postgres user (system user)Createdb weichen # create a databasePsql # access the database directly (access to the local ipvs database by default)\ L -- view the

Ubuntu mysql cannot be started for simple troubleshooting. tumysql

Ubuntu mysql cannot be started for simple troubleshooting. tumysql My website has not been on for a long time. I want to open it and find that it cannot be opened, so I found a series of reasons. After a simple investigation, my vps service was

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