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Unzip installation: directly decompress dmbmanager.zip (for example, decompress it to c: dmbmanager), Open c: dmbmanagerand execute setup.exe to save the configuration item, initialize the system, and obtain the key file, and then apply for the

ORA-16698 error: BANNERCON_ID invalid OracleDatabase12cEnterpriseEditionRelease12.1.0.2.0 when DGMGRL is configured for 12.1.0.2DataGuard ORA-16698 error: BANNER CON_ID failed ---------- Oracle Database 12c Enterprise Edition Release

Create multiple column indexes on the t_user table id, userName, and email fields to create multiple column indexes (this table only has this index): altertablet_useraddindexUSER_INDEX (id, userName, email ); select * fromt_userwhereid40; se Create

Today I met a server where the mysql user in the passwd file has a shell. [Varlibmysql] $ catetcpasswd | grepmysqlmysql: x: 27: 27: MySQLServer: varlibmysql, the home Directory of mysql is varlibmysql. Today I met a server where the mysql user in

The versions of Kafka vary greatly. The following is the 0.8.1 operation method. First, cd to the bin directory of kafaka, where all the tools used to operate kafka are located. If the kafka version cannot be found or the name is incorrect, the

Today, after installing ScalaIDE for eclipse in Ubuntu, I can only go to the installation directory and click the start icon to open the program. It is very uncomfortable. I remember the left menu bar that appears when some programs are opened, then

ParnassusDataRecoveryManager (PRM) forOracleDatabase is a powerful database recovery tool that has played a role in a large number of real recovery cases, its powerful recovery capabilities and easy-to-use graphical human-machine interface allow

Recently, some projects require heterogeneous migration. The source platform is windows64bit and needs to be migrated to linux64bit. The database platform is oracle10.2.0.464bit. The main migration method to be discussed here is the convertdatabase

During the patch analysis, I accidentally discovered this bug. After a rough look, it was still amazing. This bug almost exceeded all mainstream versions of the Oracle database. This reminds me of the previous problems with SolarisCrash. Later, I

1. keepAlived + Mysql uses KeepAlived to implement high-availability MYSQL_HA cluster environment. MYSQL is a master-master synchronous replication relationship to ensure data consistency on the MYSQL server. KeepAlived is used to provide virtual IP

WhileabignumberofusersuselargefarmsofRedisnodes, fromthepointofviewoftheprojectitselfcurrentlyRedisisamostlysingle-instancebusiness.Ivebigplansaboutgoingdistributedwiththeproject, totheextentthatIm While a big number of users use large farms of

Scalability, that is, Scalability t. experiences and Lessons from cnz8wbRUsReddit system expansion: 1. automation as much as possible, 2. there is no need to build a scalable architecture at the beginning. 3. do not build an SOA architecture at the

There are many common methods for Oracle-related optimization, as we all know, such as: select * is not recommended for use, and the efficiency is very poor. It is recommended to explicitly retrieve columns, even all fields should be listed. Count (*

This is an example of using scripts to update databases. the running environment is bashshell, the first parameter of shell is go, and the second parameter is a list of SQL files. the first parameter actually does not have any meaning, but it is

In addition to the common indexmerge case (IndexMergeUnionAccessAlgorithm) described earlier, there is also a rare and special indexmerge that performs intersection after multiple index scans, that is, IndexMergeIntersection. This type of execution

The count () function uses count (*) to return the number of rows to be retrieved, whether or not it contains NULL values. When SELECT is retrieved from a table, but no other columns are retrieved, and there is no WHERE clause, COUNT (*) is

I previously made an InnoDB sharing, mainly about the structure of B + Tree in InnoDB AND THE IMPLEMENTATION OF MVCC. PaperwritingservicesPPT :? Below BpTree_MVCC, I will sort out the PPT content a little. The first is B + Tree. The following

Since it is the query result of hive, We must modify the handler in hueapps to add the code: EXPORT_CHART_SETgb2312 on defdownload (handle, format, db): In defdownload (db) CSVformatter and CSVformatte Since it is the query result of hive, We must

1. the redis List is used as a queue, Which is lightweight and does not need to be introduced to other queue servers. The disadvantage is that data may be lost because its persistence scheme is redis's common aof or rdb method 2. put the sorted

If you want to make statistics on the data in hbase, such as the maximum value of a field, the number of records meeting certain conditions, and the characteristics of various records, and classify by record features (similar to SQL's groupby )~ The