toad for oracle features

Add columns with default values in Oracle tables (including new 12C features) and oracle12c This is a problem that I have been paying attention. 11G has been improved on this issue, and 12C has some new features. For a discussion on the new features of 11g, refer to my blog http://blog.csdn.net/dbcrocodile/article/deta

explicitly inserted; METADATA-ONLY default value refers to the default value specified when a new column is added, and the difference in 11g is that, the default value of 11g must be not null. 3. extend the length limit of multiple data types: Increase the VARCHAR2, NVARCHAR2, and RAW types to 32 K, set compatibility to 12.0.0.0 or above, and set the initialization parameter MAX_ SQL _STRING_SIZE to EXTENDED, this function does not support CLUSTER tables and index organization tables. In the en

, jumping from one interface to the interface): In addition, here is a small trick, that is, I clicked "marked as read" after the direct page refresh, display the results of the operation, without jumping to other interfaces. It's a struts2 action. Jumps to the function that has an action, that is, after the action of the second action is completed, jumps to the action of the first action. In this, Struts.xml should be configured like this: End of background.Finally, the front end is displa

Adding columns with default values to tables in Oracle (including new 12C features) This is a problem that I have been paying attention. 11G has been improved on this issue, and 12C has some new features. 12C adds the new 11g feature in this regard. Add a column in 11G and set the default value. Instead of changing the actual data in the table, mark the data

>1II) Location of the Relink logCase 1If the relink operation is performed through Oui, the "$ORACLE _home/install/relink.log" file is not generated by default.In order to send relink output to $ORACLE _home/install/relink.log, we need to explicitly redirect the output$ORACLE _home/oui/bin/runinstaller-relink-waitforcompletion-maketargetsxml $

New Features of Oracle 11G: collecting multi-column statistics Generally, when we submit an SQL statement to an Oracle database, Oracle selects an optimal method for execution, which is achieved by the Query Optimizer. CBO (Cost-Based Optimizer) is the default query Optimizer mode used by

=8192*.db_domain= "*.db_name= ' Matrix '*.db_recovery_file_dest= '/u2/oracle/fast_recovery_area '*.db_recovery_file_dest_size=4322230272*.diagnostic_dest= '/u2/oracle '*.dispatchers= ' (protocol=tcp) (SERVICE=MATRIXXDB) '*.memory_target=419430400*.open_cursors=300*.processes=150*.remote_login_passwordfile= ' EXCLUSIVE '*.undo_tablespace= ' UNDOTBS1 '*.db_unique_name= ' MATRIXDG '*.log_archive_config= ' dg_c

The following articles mainly introduce the five most unique features of Oracle 11g. We all know that compared with the storage data in the non-compressed format, the new Oracle Data Compression Technology ensures that the disk storage space is reduced by more than three times with lower overhead. This is more advantageous than saving only disk space, because it

data will not be backed up, restored, and there will be no log information for its modifications5) temporary tables do not have DML locksDML Locks is not acquired on the data of the temporary tables. The LOCK statement have no effect on a temporary table, and because each session have its own private data.6) Although DML operations on temporal tables are faster, the same is true for Redo log, which is the same DML statement, less than the Redo log generated for PERMANENT DML. Please see the off

When we started to insert large amounts of data into an empty indexed table, there was no fragmentation problem, but after a long period of additions and deletions, the database will inevitably have fragmentation problems that affect the performance of the database, and Oracle has its own solution to this problem.Here are some solutions to this problem:The first thing to do is to analyze the index:analyze index ind_1 validate structure; Ind_1 the inde

Gets the exception that occurs when the sequence ID is checked to see if the Oracle database table ID field type is number type. If a long is modified to number. About number type: http://www.blogjava.net/caojianhua/archive/2011/01/24/343461.html severity: nulljava.sql.sqlexception The:ora-22816:returning clause does not support feature atoracle.jdbc.driver.sqlstatemapping.newsqlexception ( sqlstatemapping.java:70) atoracle.jdbc.driver.databaseerror.n

Tags: Oracle 12.2 online moveBefore the Oracle12.2 version, a move operation on a table adds a exclusive lock to the table, and the DML operation cannot be performed on the table. Although the move operation has an online clause, it applies only to IoT tables, not to heap tables. This means that you cannot perform any DML operations while doing a move operation on the table, and you can only stop the business if you are doing a move operation on the k

;Table altered.--View index statusSql>Col index_name for A25Select Table_name,index_name,status,blevel,leaf_blocks,orphaned_entries from user_indexes where index_name = ' IDX_ Andy_id ';table_name index_name STATUS blevel leaf_blocks ORP------------------------- ------------------------- -------- ---------- ----------- ---Andy_move idx_andy_id VALID 0 0 NO--Move online partition table errorSql> ALTER TABLE P_andy move online;ALTER TABLE P_andy move online*ERROR at line 1:Ora-14808:table does not

Label: Triggers and sequencesCREATE OR REPLACE TRIGGER t_mstb_bds_data before INSERT on mstb_bds_data for each ROW DECLARE INTEGRITY _error EXCEPTION; ERRNO INTEGER; ErrMsg CHAR (n); DUMMY INTEGER; FOUND BOOLEAN; BEGIN SELECT Seq_mstb_bds_data. Nextval INTO:NEW.data_id from DUAL; -- ERRORS handling EXCEPTION when Integrity_error then raise_application_error (ERRNO, errmsg); END; Create sequence Seq_mstb_bds_data minva

Tags: des style blog http color io os using ARThis series of articles is a summary of some of the new features of Oracle database 12c, including database management, RMAN, high availability, and performance tuning, Syed Jaffer Hussain.1. Online renaming and repositioning of active data filesUnlike previous versions, the migration or renaming of data files in the Oracle