Oracle

ORACLE needs to create multiple cursors and nested loops: The data of cursor 1 is traversed each time the record of cursor 2 is traversed, insert the temporary table create or replace procedure testq is DownDictate VARCHAR2 (200) DEFAULT '';

Comparison between LOGMNR mining logs and DUMP logs many people know that LOGMNR is used to analyze logs, but few people use DUMP to analyze logs. This is because the information analyzed by LOGMNR is easy to read and understand. but sometimes we

Single quotation marks and double quotation marks can be used in column values. For example, the following INSERT statement specifies that the new customer's surname is O 'Malley. Note that the letter O in the surname is followed by two single

In ORACLE, the insert into and select into statements are compared. In oracle databases, we commonly use the insert into TableName (column1, column1,...) statement to insert Table data ,...) values (value1, value2 ,...), this is the most basic table

The Oracle audit technique is used to track the DML action of the oracle background database create or replace package when is procedure pro_monitor_drop_policy (object_schema in varchar2); procedure when (object_schema in varchar2); procedure when;

Common Oracle functions: nvl/nullif/case when/wm_concat/replace 1. nvl function nvl converts a null value to an actual value. The data type can be date, number, character, and data type must match: nvl (commision, 0) nvl (hiredate, '01-JAN-87 ') nvl

Use expdp/impdp to import data from one database to another. 1. create DIRECTORY (the DIRECTORY must be created under the Database User) SQL code sqlplus system/manager create directory test_dir as '/home/orauat/zzj'; 2. Authorize SQL code Grant

Oracle implicit data conversion rules The following rules govern the direction inwhich Oracle makes implicit data type conversions (in oracle, if different data types are associated, if The data is not explicitly converted, it will implicitly

Oracle materialized view generally uses a materialized view because there are a large number of query summaries and the speed is taken into account. I simply sorted out what I used. First look at the simple creation statement: create materialized

Method 1: Add Set define off before the SQL statement to be inserted; when we run the SQL> show all command under SQL * PLUS in batches with the original SQL statement, we can find a parameter: define "&" (hex 26 ), as shown below ...... concat ". "(

Rac creates a data file in a non-shared location. oracle 11g 11.2.0.1linux server 64-bit 5.4 node1: Creates a data file '/tmp/rman. dbf' is not stored in the shared disk. Then, a table casd is created and data is added. In this case, the following

An SQL statement is used to query the names of students whose scores are greater than 80 in each course. There are three tables: S, C, and SC S (Sno, Sname) C (Cno, Cname) SC (Sno, Cno, grade) --------------------------------------------------

In Oracle, The TO_DATE format and other date functions are in the TO_DATE format (take the time: 13:45:25 as an example) Year: yy two digits two-Year display value: 07 yyy three digits three-Year display value: 007 yyyy four digits four-digit year

Error installing database C [ld-linux-x86-64.so.2 + 0x14d70] On RedHat6, when installing Oracle 11g R2, run runInstaller and immediately jump out of the following error. # An unexpected error has been detected by HotSpot Virtual Machine: # SIGSEGV (0

If the oracle paging value is greater than or equal to the paging critical point, the SQL code SELECT * FROM (SELECT. *, rownum rn from (select * from t_agent t where t. agent_parent = 20020 and t. agent_state = 0) a where rownum 0; Incorrect: only

[Oracle] Data Guard-Redo applications physical Standby and logical Standby Log application services are divided into two types, one is physical Standby Redo applications, similar to media recovery, its advantage is that the speed is fast, but in 10g

[Oracle] role switching between Data Guard-Switchover and Failover Data Guard master/Slave databases can be divided into the following two types: 1) SwitchoverSwithchover is generally artificially scheduled for role switching, such as upgrading. It

[Oracle] Data Guard-Create physical Standby experiment environment Primary: Host: jabdw1241SID: O01DMS0DB_UNIQUE_NAME: O01DMS0Standby: Host: jabdw1242SID: O01DMS0DB_UNIQUE_NAME: O01DMS0DR 1. primary configuration and operations 1) confirm that

ORA-01548: active rollback segment XX found, terminate dropping tablespace execution statement: drop tablespace name error: "ORA-01548: active rollback segment '_ SYSSMU11_4270384673 $ 'found, terminate dropping tablespace error cause: to delete the

[Oracle]-[sort aggregate]-count and index Oracle10g: create table t_count as select * from dba_objects; create index t_count_ I on t_count (object_id): select count (*) from t_count; select count (object_id) from t_count; select count (object_name)