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  RocketMQ

  RocketMQ this document is mainly for rocketmq actual code use, common words introduction, etc. View other documents download http://rocketmq.apache.org/release_notes/release-notes

  2022-06-01 12:23:12 Views: 269
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  Introduction and installation of MongoDB

  Introduction to MongoDB MongoDB is a high-performance, open source, schemalless document database, which is a popular one in the current NoSql database. It can be used to replace the traditional relational database or key / value storage in many scenarios. Mongo uses C++

  2022-06-01 12:23:11 Views: 296
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  Oracle Study-AIX6.1 to build Oracle 11gR2 RAC (1)

  Oracle Study-AIX6.1 to build Oracle 11gR2 RAC (1) Environment: operating system: AIX 6100-09 (SP3) Cluster: HACMP6.1 Cluster Software: GI 11.2.0.1

  2022-06-01 12:23:11 Views: 204
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  PostgreSQL initiates recovery through the checkpoint open wal file

  StartupLOG::- > record = ReadCheckpointRecord (xlogreader, ControlFile- > checkPoint, 1, true)-> record =

  2022-06-01 12:23:11 Views: 253
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  Oracle12C single instance dataguard configuration

  Oracle user environment variable configuration: ORACLE_BASE=/orcl/app/oracleORACLE_HOME=$ORACLE_BASE/product/12.2.0/db_1ORACLE_SID=or

  2022-06-01 12:23:11 Views: 254
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  Implementation of memcached + keepalived High availability Cluster under Centos7

  Memcached + keepalived High availability Cluster memcached Memcached is an open source high performance distributed memory object caching system that stores all data in memory because a large

  2022-06-01 12:23:10 Views: 201
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  About "INS-40922 Invalid Scan Name-Unresolvable to IP address"

  Today, I encountered an error "INS-40922 Invalid Scan Name-Unresolvable to IP address" when installing rac11.2.0.4 on a virtual machine. In fact, this problem should not be very common, and

  2022-06-01 12:23:07 Views: 251
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  In the case of high concurrency and high load, how to add fields to the table and set the DEFAULT value?

  In the case of high concurrency and high load, how to add fields to the table and set the DEFAULT value? Before Oracle 12c, when the Oracle table had hundreds of millions of data, execute "ALTER TABLE XXX ADD COLUMN_XX VAR" on the table

  2022-06-01 12:23:00 Views: 204
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  PostgreSQL Database role (5)

  Use the concept of roles to manage database access. Roles can be database users and a group of database users, and can have database objects. -1. The database role is independent of the operating system user. Create a role: create role name

  2022-06-01 12:22:59 Views: 296
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  57-4 Database slicing concept and implementation of mongodb sharding

  04 the concept of database fragmentation and the implementation and configuration environment of mongodb sharding: node1: 192.168.1.121 CentOS release 6.7node2: 192.168.1.122 Cent

  2022-06-01 12:22:59 Views: 229
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  Out of sync will occur at some point in master-slave.

  Recently found that there are two servers, master-slave will be out of sync at some point, and then quickly restore. It should be caused by binlog logging. Modify the following parameters: key_buffer_size=512Mbulk_insert_buffe

  2022-06-01 12:22:29 Views: 209
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  MySql Learning Notes (9): index invalidation

  Data preparation: CREATE TABLE `tblog` (`id` int (11) NOT NULL auto_increment, `title` varchar (50) default NUL

  2022-06-01 12:22:29 Views: 203
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  Installation and configuration of php oracle extension OCI8 under linux system

  Installation and configuration of php oracle extension OCI8 under linux system PHP program visits oracle DB time: September 02, 2014 author: Liu Qunying (qunyingliu) Environment description: apache version, PHP version

  2022-06-01 12:22:28 Views: 261
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  PMON (ospid: 2853): terminating the instance due to error

  It was found that the oracle database was down this morning, and it was normal to restart the database. After querying the alter log, it was found that PMON (ospid: 2853): terminating the instance due to e appeared at 23:00.

  2022-06-01 12:22:25 Views: 261
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  Foolish installation of ORACLE

  When you first learn ORACLE, you will encounter some trouble when installing ORACLE in the LINUX environment. Preface: especially those who do not have the foundation of LINUX will have no idea how to install it. Baidu installs ORACLE, and the installation steps are also quite troublesome. Here I will introduce to you.

  2022-06-01 12:22:02 Views: 247
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  Mysql5.6.42-- compilation and installation

  1. Installation environment Centos6.5 64-bit 2. Prepare to uninstall the old version before compilation and installation: # rpm-qa | grep-I mysql#rpm-ev-- nodeps mysql-libs-5.1.73-8.el6

  2022-06-01 12:21:50 Views: 210
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  Percona5.7 TokuBackup supports TokuDB hot backup

  Percona5.7 TokuBackup supports TokuDB hot backup. 1. Install tokudb engine. Execute the following script to install tokudb automatically. # bin/ps-admin-defaults-file=/etc/my

  2022-06-01 12:21:50 Views: 293
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  ORA-01012: not logged on

  Modify the parsing in the host file, resulting in sqlplus login error ORA_01012 error, modify back, use shutdown abort to close the database, and then restart the database 10.10.64.35 aix172.

  2022-06-01 12:21:50 Views: 284
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  Mysql5.7-mmm high availability cluster under Centos7

  Introduction to mysql5.7-mmm High availability Cluster MMM under Centos7 MMM (Master- Master replication manager for MYSQL, MYSQL Master replication Manager) is a set of

  2022-06-01 12:21:50 Views: 294
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  Mysql string concatenation + set null value

  # string concatenation concat (s1Magol S2); concatenate the strings in last_name and first_name in the table select concat (last_name,first_name) as name from

  2022-06-01 12:21:49 Views: 207