what is oracle exadata

What Does oracle do when executing commit? COMMIT is a very fast operation. When we release the commit command, the really difficult action has been completed and the data changes have been executed in the database, therefore, 99% of the tasks have been completed. Www.2cto.com For example: The following operations have been generated: 1. the undo block has been g

) End as Zheng2numFrom (Select Du.duty_user,SUM (case time du.duty_schedule like ' early% ' then 1 end) as morning,SUM (case if du.duty_schedule like ' late% ' then 1 end) as night,SUM (case if du.duty_schedule like ' in% ' then 1 end) as noon,SUM (case when du.duty_schedule= ' others ' then 1 end) as other,SUM (case when du.duty_schedule= ' is 1 ' then 1 end) as Zheng1,SUM (case when du.duty_schedule= ' positive 2 ' then 1 end) as Zheng2From Crm_duty

What Oracle DBA should do on a daily, weekly, and monthly basis (I) Check alert on a daily basis. log ② check the environment ● check whether the database instance is working properly ▼ ps-ef | grep ora _ explain select status from v $ instance ● whether the listener is working properly ▼ lsnrctl status ● whether the t

Index | performance ORA FAQ Performance Tuning Series-- The Oracle (tm) Users ' co-operative FAQ Why would a reverse index to useful when the leading column of the "index is" generated from a sequence? When the first column of the index is generated by the sequence, what is

We all know that synonyms can be used in Oracle. The main function of synonyms is to hide the identity of the base table and reduce the complexity of SQL statements, because the user does not need to know which table is represented by the synonym, and thus does not need to specify the name of the table owner, what

\simple-jndi\jdbc.properties. Like what: ############ ORACLE ################ Ora/type=javax.sql.datasource Ora/driver=oracle.jdbc.driver.oracledriver Ora/url=jdbc:oracle:thin:@127.0.0.1:1521:orcl Ora/user=system Ora/password=system ############ MSSQL ################ Mssql/type=javax.sql.datasource Mssql/driver=net.sourceforge.jtds.jdbc.driver Mssql/url=jdbc:jtds:sqlserver://127.0.0.1:1433;databasename=tes

Tags: server start start RTU tab tables ERP error creatEach database has a Alert_A database alert file is a log file that lists messages in chronological order, such as: Any non-default initialization parameters used at startup All internal errors (ORA-600), block corruption errors (ORA-1578), deadlock errors (ORA-60) that have occurred Administrative operations, such as SQL statements create, ALTER, DROP DATABASE, and Tablespace, and Ente

What is XML? XML is the abbreviation for Extensible Markup language XML is a markup language similar to HTML XML is used to describe the data The markup for XML is not predefined in XML, you must define your own markup X

Go What to do if the swap partition is too small. [Oracle@flynet mail]$ Su-rootPassword:[Root@flynet ~]# Swapon-sFilename Type Size Used Priority/DEV/SDA2 Partition 409648 0-1[Root@flynet ~]# Df-hFileSystem Size Used Avail use% mounted on/dev/sda3 268G 49G 205G 20%//DEV/SDA1 99M 13M 81M 14%/bootNone 2.0G 0 2.0G 0%/dev/shm[Root@flynet ~]# Free-mTotal used free sha

); BEGIN V_date: = to_char (sysdate, 'yyyymmdd '); If substr (v_date, 7,2)> = 01 AND substr (v_date, 7,2) THEN ACCOUNT. PR_MERGE_QUERY_REPORT (to_char (SYSDATE, 'yyyymmd')-1, to_char (SYSDATE, 'yyyymmdd'), V_CODE, V_MSG, V_ERR ); ELSE ACCOUNT. PR_MERGE_QUERY_REPORT (to_char (SYSDATE, 'yyyymmd'), to_char (SYSDATE, 'yyyymmdd'), V_CODE, V_MSG, V_ERR ); End if; END; / Exit; ! B) crontab Use crontab-e to edit 30 22 ***/export/home/bss/pr_merge_query_report.sh>/export/home

: 8080 Take a look at what XE has installed in our system. Service Detail list: OracleservicexeThis is the actual database engine. OraclexetnslistenerThis service was responsible for listening incoming connections and passing successful connections to the database engine. Note, if this service is down, you won ' t being able to connect to the datab

A What is freelists this paper is to explore freelists and freelist Groups's role, access mechanism, contention for diagnostic and optimization methods, and the use of theory and testing to overturn some long-standing erroneous ideas. The reader of this article should have a deeper knowledge of Oracle, which may not b

Although the Oracle system has already provided several techniques for tuning system performance, if the database design itself is problematic, especially in terms of structure, what can you do if you have the power to do? Therefore, it is absolutely necessary for Oracle Dat

Oracle cold, stay at home and read the "Mastering Oracle SQL" 2nd, found that Oracle's function is still very strong, there are 200 optical functions, hsql is difficult to match. The next stubborn, it seems either to risk using Hibernate3.0 SQL mapping function, or to run the JDBC assembly VO. 1. Report Totals dedicate

What if Oracle archive logs are full (ora-00257)? oracleora-00257 Oracle Database error ORA-00257: archiver error. Connect internal only, until freed, how to solve it? This problem is located when the archiving logs are full. We will share with you the specific solutions below. Solution: SQL> select * from V $ FLASH_RE

Label:The classic problem with Oracle database snapshot too old what caused it Oracle Classic Error Solver: ORA-1555 error (Snapshot too old)-... The book says it's because the rollback image need for read consistency have prbably been overwriteten by an active transaction. I am surprised if a transaction occupies some rollback segments until it commits, the rol

This chapter analyzes the listener log file and describes what is recorded in the listener log file. This chapter includes the following topics: bull; listener log audit trail information bull; Monitoring This chapter analyzes the listener log file and describes what is recorded in the listener log file. This chapter i

A simple Web application architecture that:Presentation layer (Web browser or rendering engine) ——— > Logical layers (such as programming languages such as c#,asp,.net,php,jsp) ——— > Storage tiers (such as databases such as Microsoft SQL server,mysql,oracle)A complex Web application architecture:The presentation layer (Web browser or rendering engine) ——— > Logical layer (such as programming languages such as c#,asp,.net,php,jsp) ——— > Application lay

Customer deposit001 Nanshan District, $002 Luohu District $003 Baoan District $Implement a numbered join condition that joins two tables into a temporary table containing only numbers. Product name. Customer Name. Deposit. Total amount,Total Amount = deposit * number, temporary table placed in stored procedureThe code is as follows:Create proc Temp_saleAsSelect a. Product number, a. Product name, B. Customer's name, B. Customer's deposit, A. Customer

what is an ORM framework Object-relational mapping, the current database is relational database ORM is mainly to map the relational data in the database to the object in the program. The common ORM Framework is currently concentrated1 NhibernateReason: Use more, the data