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--- SELECT * FROM (SELECTDISTINCTcolumn1FROMtable1) Explain ssapply (SELECTcolumn2 (SELECT [*] column2FROMtable1WHEREcolumn1A. column1FORXMLPATH (), TYPE ). value (, nvarchar (20) B ---- SELECT * FROM (SELEC --- First SELECT * FROM (select distinct

Introduction: expimpexpimp, a logical import and export tool in oracle, is the oldest two command line backup tools survived by oracle. Introduction to the logical import and export tool exp/impexp/imp in oracle: exp/imp is the oldest two command

Mysql5.6 gtid (GlobalTransactionIDs) introduced in MySQL5.6 Based on GTID master-slave replication and mysql-proxy read/write separation makes the configuration, monitoring and management of its replication function easier to implement and more

1. Install mysql1 in windows. Set the system environment variable and create a new system variable named MYSQL_HOME in the system environment variable. The value of the variable is: mysql installation Path. Add one Path to the Path: % MYSQL_HOME % \

In linux, use mysqldump to back up A mysql database into an SQL file. Phase 1: create A full backup mysqldump-hip address-uusername-ppassword-~ Name. SQL exports the entire database (structure and data) to the slave database in this case. In linux,

System Environment: centos6.264-bit kernel version: 2.6.32-220. el6.x86 _ 64mysql version: 5.1.62 if you like this blog post, please give a thumbs up. For more blog posts, visit the linux open source technology blog 1, MySQL many System Environment:

Case: to reduce the burden on the core database, we use the logical STANDBY technology to separate the impact of physical reading on the core database. However, a report application uses a large number of intermediate tables. Case: to reduce the

I. Basic classes required by database transactions (1 ). sqlConnection is used to connect to the database; (2 ). sqlCommand is the execution of SQL statement commands; (3 ). sqlTransaction is the start of a transaction. 2. transactions are

This problem was encountered by a friend who made an SSIS program to import data to txt. Then, use Oracle tools to import data to Oracle. However, when performing the variable step in SSIS, we can find the output column name and the queried column

For more blog posts, please note: Children without umbrellas must work hard (www.xuchanggang.cn) 1. install the dependent package required by mpm: [for the sake of security, the agent also installs the following dependent package] [root @ client141 ~

Copy directory of MySQL database backup: 1. mySQL replication Overview 2. advantages and ideas of MySQL replication 3. master server settings in the Data Replication environment 4. slave server setting for Data Replication environment 5. create a

SupplementalLog is a complementary type of log. It is mainly used for technologies such as logical Standby Database Synchronization, LogMiner, Streams, and Flashback. For logical Stand Supplemental Log is a complementary type of Log. It is mainly

Implementation of auto-expanding partitions in Oracle (use interval partition after 11 GB) Implementation of auto-expanding partitions in Oracle (use interval partition after 11 GB) Create error table: Create sequence seq_error_log_id;Create

Phenomenon: GG do initdataload report error OGG-00869OGG-001992013-11-1115: 54: 18INFOOGG-03501OracleGoldenGateDeliveryforOracl Phenomenon: GG do init data load report error OGG-00869 OGG-001992013-11-11 15:54:18 INFO OGG-03501 Oracle GoldenGate

DG cannot automatically mount causes the database to fail to start properly: ORA-01157, ORA-01110, ORA-17503, ORA-15001, ORA-15001 phenomenon: after each restart of the entire CRS, D DG cannot automatically mount causes the database to fail to start

The experiment found that oracle11gR2 was used to create tables, indexes, and other objects without data. In order to save space, oracle did not allocate segment, but allocated only when there was a dml operation. The experiment found that

When using RMAN to copy a physical standby database, it is prone to errors and the error is very strange. I have summarized the issues below. 1. RMAN-04006ORA-12528, boot slave database to nomoun When using RMAN to copy a physical standby database,

The temporary table of Oracle only exists in a session or transaction lifecycle. The data in the temporary table is only visible to the current session. When the session exits or the user submits a commit The temporary table of Oracle only exists in

Autocommit {0 | 1} sets whether MySQL transactions are automatically committed. 1 indicates immediate commit, and 0 indicates explicit commit. The role is global or session and can be used in the configuration file (but not in versions earlier than 5

In Oracle, to improve SQL Execution efficiency, You need to reduce hard parsing to achieve sharedcursor sharing. The most common method is to bind variables. In Oracle, to improve SQL Execution efficiency, You need to reduce hard parsing to achieve