Oracle

Oracle Decode () Functions and CASE statements are often used. What are their differences? The following is a detailed introduction The difference between the Oracle Decode () function and the CASE statement is for your reference. First, let's give

Oracle metric index usageOracle provides a monitoring index method to determine whether an index is used. If indexes are not used, you can delete them to reduce unnecessary statement overhead. Because a large number of unnecessary indexes on a table

1: differences between char and varchar2: Varchar2: variable-length variable length Char: fixed-length fixed length Memory is allocated when char is defined, while varchar2 dynamically allocates memory. The following example clearly illustrates the

The following is a detailed analysis of the similarities and differences between Lock and Latch in Oracle. For more information, see First, let's talk about what they have in common:They are essentially an exclusive lock on resources and are all

Oracle has three table connection technologies: Nested connection, merge connection, and hash connection. 1. nested loop Join) Nested connection divides the dataset to be processed into an External Loop (driving data source) and an internal loop

Small editor in VMware Server 1.0.8 when installing Oracle RAC, encountered a PRKC-1002 error: WARNING: error while copying directory/u01/oracle/product/10.2.0/db_1 with exclude file list 'null' to nodes 'rac2 ′. [PRKC-1002: All the submitted

The DBMS_RANDOM package in Oracle encapsulates some functions that generate random numbers and random strings. The following are commonly used: DBMS_RANDOM.VALUE Function This function is used to generate a random number. It can be used in either of

Oracle concepts-Overview of database files: Oracle contains three basic files: 1: data file) 2: control file) 3: online redo log file) Concepts of oracle Database files: The final component of the oracle database architecture is reflected in the

When creating EM, an error is reported: Configuration: Failed to unlock mgmt_view account 22:47:03 oracle. sysman. emcp. EMReposConfig invoke Severe: cannot unlock all EM-related accounts 22:47:03 oracle. sysman. emcp. EMConfig perform Severe:

Create temporary tablespace Create temporary tablespace test_temp TEMPFILE 'C: oracleproduct10.1.0oradataorcltest _ temp01.dbf' SIZE 32 M AUTOEXTEND ON NEXT 32 m maxsize 2048 M Extent management local; Create a tablespace CREATE TABLESPACE

Problem prompt ERROR message: ERROR: ORA-12514: TNS: listener cocould not resolve SERVICE_NAME given in connect Solution: The Code is as follows: 1. Open /Network/admin/listener. ora file, find: SID_LIST_LISTENER = (SID_LIST = (SID_DESC

1. Choose "start"> "Settings"> "Control Panel"> "Administrative Tools"> "services" to stop all Oracle services. 2. Start-> Program-> Oracle-OraHome81-> Oracle Installation Products-> Universal Installer uninstalls all Oracle Products, but the

1. Open the corresponding database through plsql. 2. Select the export users objects sub-menu under the menu tools 3. Select the name of the table to be exported and select the saved path. 4. Click the export button to export the selected

I. Partition Table related experimentsCreate a list Partition TableCreate table t3 (id number, city varchar2 (10 ))Partition by list (city)(Partition p1 values ('sh', 'js', 'zj '),Partition p2 values ('bj ', 'tj', 'hb '),Partition p3 values ('gz ', '

-- Create table statementORACLE:Create table _ table_name (Column1 varchar2 (10) primary key,Column2 number (5) not null,Memo varchar2 (100));Comment on column _ table_name.column1Is 'This is the comment of column1 ';SQLSERVER:Create table _

-- 19-1: CREATE a FUNCTION without parameters: create or replace function cur_datetimeRETURN VARCHAR2ISBEGINRETURN TO_CHAR (sysdate, 'yyyy "year" MM "month" DD "day" HH24 "Hour" MI "Minute" SS "seconds" '); END;/-- 19-2: create or replace function

When executing a stored procedure, we may encounter permission problems.● Definer permission Stored Procedure● Caller permission Stored ProcedureWhen creating a stored procedure in a database, the User-Defined permission is in the default mode.After

Access Oracle 10 through SQL Server 2005 Express EXEC master. dbo. sp_addmediaserver @ Server = n'testlink ', @ Srvproduct = n' Oracle ', @ Provider = n'msdaora ', @ Datasrc = n' Test' GO Create a database link under SQLServer. Connection name:

Wed Aug 20 17:16:37 2008ORA-1652: unable to extend temp segment by 128 in tablespace DBA_TEMP To solve this problem, we need to first cause the problem of SQL, there are several possible methods: 1. Set events Alter system set events '1652 trace

1. Set automatic database backup control files and SPFILE files 2. Zero-level full database backup for RMAN every Sunday 3. Perform RMAN Level 1 Incremental Backup every day (except Sunday) 4. Full database backup and Incremental backup within