Oracle

How to trace from a child node to a parent node in Oracle. For example, there is a table: GUID Parentguid 1 0 2 1 3 1 4 2 5 2 6 5 7 5 8 7 We can detect all the child nodes under the GUID from the GUID 1 according to the parentguid

Scenario: There is a database encoded as UTF8 on the server, and then the local is ZHS16GBK. I directly with the EXP command to guide down, found that the database is garbled. Resolution process: Because the code on the server is not easy to change,

 --1 on the migration target machine newCreate tablespace tzsb datafile ' I:\app\Administrator\oradata\orcl\tzsb01.dbf ' size 500mCreate user WGM_TZSB identified by pwd123 default tablespace tzsb temporary tablespace temp Quota unlimited on TZSB

Due to field application needs, the newly configured Oracle RAC environment needs to be added with 2 Scanip addresses, 10.138.129.106 and 10.138.129.107. Pre-configuration scenario: [grid@db1 ~]$ srvctl config scan----View configuration information

Today the program works locally and can be posted to the server The Times a ORA-00911 invalid character error This error is due to a problem with the SQL statement, check the SQL did not see any problems, the results were taken to the library inside

Installing oracle11g on Centos6.4 does not set the character set, using the operating system default character set: we8mswin1252, which modifies the character set to: Al32utf8. Sql> Select Userenv (' language ') from dual; Simplified Chinese_china.

Each group of queries can get its result set, if the need to combine multiple query results into a result set, can be implemented by the set operation. such as union, and set, and do not remove duplicate rows (unoin all), intersections (INTERSECT),

method One: Control Panel-> management Tools-> Service-> Oracl ...   Database name ... Method Two: Run Services.msc Open service, put the inside of the Oracleservice. Just wait for the service to start. Method Three: Linux, it's got

Reason Oracle Httpserver takes up 8080 ports Solution 1. Find the Server.xml under the Conf folder under the Tomcat directory Modify maxthreads= "minsparethreads=" maxsparethreads= "75"Enablelookups= "false" redirectport= "8443" acceptcount=

* This import export method is fully applicable to the partition table * prepare before exporting, importing Note: Use System user actions such as SYS, systems, and so on.1) Create directory objects CREATE DIRECTORY exp_dir as '/oracle/db/zone ';

INSERT INTO Jwxt.jy_zyxx A (a.jxjhh, A.SSXQDM, A.nj, A.ZYDM, A.XKLBDM, a.rs, A.bjs, A.ZSKCS, A.ZDBYXF, a . GGBXXF, A.GGXXXF, A.XKBXXF, A.XKXXXF, A.ZYBXXF, A.zyxxxf1, A.zyxxxf2, A.SJKXF, A.FSSJXF, A.JQSJXF, a. YYFJXF, A.KWXF, A.TSBXXF, A.TSXXXF, A.

For some reason, Oracle on the old computer is often disconnected, and the newly bought computer is normal, and all three-party software that connects to Oracle is disconnected, like pl/sql. So, I wonder what the cause is. 1, here to cite a

1 Build partition Table --Create TABLE CREATE TABLE partition_table ( field1 INTEGER, field2 VARCHAR2), Field3 INTEGER, ) partition by Range (field3) interval (86400) (partition P1 values less than ( 1431964800)) nologging tablespace

Oracle has a number of views built into the SYS user scenario that we can use to easily view system-related information. We can call these views without schema, and here are some Summary of views about user, role, and permission information: (1) all_

A stored procedure is a program block stored in a data dictionary that can be shared among different users and applications, and enables optimization and reuse of programs. First, the creation and execution of stored procedures 1. Create stored

Performance optimization for Oracle databases Mainly from internal storage structure, logical partitioning, table structure paradigm, SQL statement optimization. Hibernate at higher levels, mainly from caching, and the use of SQL statements For

--View Oracle database Character set: Select Userenv (' language ') from dual; Query results: 　 Simplified Chinese_china.　　Al32utf8 --modifies the Oracle database character set: (In SQL Plus) sql> conn/as sysdba; sql> shutdown

2.TRUNC (for number) The TRUNC function returns the processed value, which works very much like the round function, except that the function does not round the specified decimal number before or after the appropriate rounding selection. Its specific

@SequenceGenerator (name= "Sqecagegory", sequencename= "Categorydb", allocationsize=1) Import javax.persistence.Entity; Import Javax.persistence.GeneratedValue; Import Javax.persistence.GenerationType; Import Javax.persistence.Id; Import

Oracle 11g introduces snapshot Standby, which allows Standby database to be opened in Read-write mode. When switching back to standby mode, all modifications in the Read-write mode are lost. It is implemented through the flashback database, but