Database Administrator

[Translated from mos] When the parallel transaction recovery process is running, disable the parallel transaction recovery method. When the parallel transaction recovery process is running, disable the parallel transaction recovery method.How to

PHP operations on memcache and phpmemcache class myMemcache {private $ memcache; /*** it is generally recommended that these two values be made into constants */public function _ construct ($ host = '2017. 102.1.8 ', $ port = 6379) {$ this->

Create advanced connections for MySQL and mysql connections SQL allows an alias for a table. The two main reasons for doing so are: Shorten SQL statements; The same table can be used multiple times in a single SELECT statement; We use aliases to

Common pl/SQL judgment statements and plsql statements Statement 1: IF-THEN IF condition THEN Execution statement End if;   Statement 2: IF-THEN-ELSE IF condition THEN Execution statement ELSE Execute other statements End if;   Statement 3:

Atitit. hbnt orm db new update best practices o7, atitit. hbntorm Atitit. hbnt orm db new update best practices o7   1. merge and save. 1 2. The POJO object is in the free, persistent, and hosted state. Use of merge. 1 3. @ DynamicInsert @

Automatically generates AWR1 (SQL) and awr1sql Currently, two reliable automatic AWR generation methods have been found on the Internet. Method 1: Reference SQL link: http://www.oracle-base.com/dba/10g/generate_multiple_awr_reports. SQL -- ----------

When Mysql is installed and running, there is no mysql or performance_schema database, performanceschema Mysql ERROR 1045 (28000): Access denied for user 'root' @ 'localhost' (using password: YES)No Mysql and performance_schema databases are

Oracle is a simple method for importing big data and migrating data between databases. There are many ways to import data from oracle: This article mainly introduces two simple methods (using existing tools to import data ). 1. Import .csv data

MySQL master-slave replication (1), mysql master-slave Replication mysql replication has the following advantages: (generally, "add, delete, and modify" is handed over to the primary database, "query" depends on the database.) 1. If a problem

Relationship between OracleServiceXXX and Oracle instances in windows, oracleservicexe In fact, oracle in windows is completely dependent on OracleServiceXXX in the window service when the oracle instance is started. This XXX is the oracle Instance

Mongodb allows you to query a specific column in a relational database. Recently in tornado \ mongodb \ ansible The find () method in mongodb is awesome. You can upload all the tables in the set. class

Mysql is a strange thing. I have a table in my database. I suddenly cannot open it today .. In phpmyadmin, click the table prompt "Unknown column 'operator' in 'where clause order'", which means there is no operator field. Although this table cannot

Mysql generates table files, truncate, Load, and mysqltruncate SELECT -- ' select * from `',TABLE_SCHEMA,'`.`',TABLE_NAME,'` into outfile ''/work/opdir/repair'''-- concat('union all -- select count(1) as count_, ''`',TABLE_SCHEMA,'`.`',TABLE_NAME, '

Thoughts on SQL/NoSQL database search/query, sqlnosql Reprinted with the source: jiq •'s technical Blog Hbase features: Recently, we have been studying Hbase. Hbase has created an index based on Xingjian, and the query speed is very fast and

Chapter 1 Securing Your Server and Network (3): Use the managed service account, chaptersecuringSource: Workshop Without the consent of the author, no one shall be published in the form of "original" or used for commercial purposes. I am not

Images and raster of 2014Esri global user conference, 4esri raster1. Now Esri has used images as part of the GIS solution. What is its specific strategic deployment? Over the past decade, Esri has planned to manage and develop image and raster

Delete the selected row of the DataGridView and update the database. The previous article published the DataGridView control to display data. DataGridView often appears when dealing with databases and is also very useful. Using the DataGridView to

Alter constaints, alterconstaints 1. Create a federated primary key Alter table name add constraints end name primary key (column name, column name ..); 2. New Characters Alter table name ADD (column datatype [default value] [NULL/not null]);

C # "like" is used in the program to query access database queries that are empty, Today, we found a particularly strange problem during the development process: the like query in access is executed in the Access database and the query results can

Retired Note 1 # MySQL = lambda SQL: SQL + 'source Code 4 Explain Plan ', The Mysql query execution process is roughly divided into four stages: Syntax analysis (SQL _parse.cc ) > SQL _resolver.cc # JOIN. prepare Generate logical query plan (SQL