Oracle

Create sequence seq_newsIdincrement by 1 start with 1 maxvalue 999999999; select seq_newsid.nextval from sys. dual; Delete sqldrop sequence seq_newsId; www.2cto.com =============================== the sequence used in oracle development is a

Decompress the 10__database_win32.zip \ database.zip package of oracle 10g. decompress the package and complete the prerequisites for Oracle Installation. Then, you do not know why a memory error is reported. Then I checked all kinds of information.

Oracle databases can be archived in two different ways: NOARCHIVELOG (invalid media recovery) or ARCHIVELOG (effective media recovery ). Database backup and recovery ( http://www.dnew168.com/thread-1708-1-1.html Policy has an important impact.

Based on PL/SQL, a pl/SQL block consists of up to four different parts. Only one part is required. block: only named blocks are available, that is, the named functions, stored procedures, and other block names. declaration part: defines variables,

The principle of instance recovery when the database suddenly crashes, it is not time to refresh the dirty data blocks in the buffer cache to the data file, at the same time, when a transaction is suddenly interrupted when the instance crashes, the

How can I create a foreign key constraint in Oracle using a non-default method? If the Oracle default creation method is used, the referenced data cannot be deleted, this gives us more flexible options in Oracle9i, however, we use the on delete

There is no backup in the Archiving mode of the rman experiment. Recovery of lost data files after normal shutdown does not allow direct recovery of lost data files, such as system. Not all data files need to be recovered, for example, temp

Understand that oracle ROWID data is stored in a data file, and its attributes are determined by the storage. These attributes include: in which data file? Which object does it belong? Where is the data block? Row number? These attributes are

Analysis of oracle B-tree index search principles the same as the index and table, also belongs to a segment. It stores user data and occupies disk space like a table. However, the data storage form in the index is very different from that in the

Oralce common SQL functions (5) before using aggregate functions, we need to first understand the concept of "grouping". One of the problems we encounter in our work is grouping the retrieved data.The syntax structure of grouping is very simple,

1. Use top SQL to find the problematic SQL statement select * from (select * from v $ sqlstats order by DISK_READS desc) where rownum 'jsonbi', TabName => 'product', Estimate_Percent => 0, Method_Opt => 'for all indexed columns size 1', Degree => 4,

How can I ensure that the system can be restored to the last submitted state by importing and exporting the physical backup of the Oracle database, it must be based on physical backup, and archive logs and redo logs accumulated since the last

PLSQL is often used as the Oracle client to configure login user information. It may be cumbersome to manually enter the user name, password, database name, and other information without configuration. In fact, we only need to set it in the PLSQL

Parallel Full table scan of oracle tables sometimes, how can we make dump efficient to execute full data in oracle? This problem focuses on 1. sequential disk read. 2. parallel. the former requires oracle to provide data in the Basic Order and the

 Row_number () OVER (partition by COL1 order by COL2) indicates grouping BY COL1 and sorting BY COL2 within the group, the value calculated by this function indicates the sequential numbers after the sorting in each group (the continuous and unique

The influence of the 11g MEMORY_TARGET parameter on SGA and PGA is added to the 11g MEMORY_MAX_TARGET parameter. The first appearance of this parameter is as refreshing as the SGA_MAX_SIZE parameter appears in 10g. Memory_max_target is used to set

ExercisePaperDAOImpl // query the training memory questionsPublic List findTTMemory (int userid, int ttid, int ttgid) {String SQL = "select * from tbTTrainMemory where userid =? And ttid =? And ttgid =? Order by dbms_random.value "; Object [] args =

Create table Java code create table blobdata (www.2cto.com OID decimal (22) primary key not null, DATA blob ); create directory and process Java code CREATE or replace directory doc_loc as '/tmp'; create or replace procedure Load_BLOB_From_File

Oracle note (2) the SQLPlus command mainly uses the command line method for Oracle database operations, and all commands are completed using sqlplus. There are two forms of sqlplus. One is dos-style sqlplus: sqlplus.exe; the other is windows-style

If sqlplus command not found is prompted, use the following 01 .~ /. Bashrc02fi03 04 # User specific environment and startup programs05 06 PATH = $ PATH: $ HOME/bin07export PATH08unset USERNAME09 10 export ORACLE_BASE