Oracle

The lead () is the next record in the current order, and the relative lag () is the previous row of records in the current orderSyntax structure: lead (value_expr [, Offset][,default]) over ([Query_partition_clause] ORDER by Order_by_clause)

In general, the join method is divided into nested loop junctions (Nested Loops), Hash joins (hash-join), sort merge joins (sort merge join), and Cartesian joins (merge join Cartesian).1. Nested loop coupling (Nested Loops)Nested loops have the

--Query the actual statistical informationSelect Num_rows,blocks,empty_blocks,avg_space,avg_row_len,sample_size,Last_analyzed from Dba_tableswhere UPPER (table_name) =Upper (' t_hs_inivbalanceexpentry ');--sql number of statements and fetchSelectSql_

http://blog.csdn.net/davidhsing/article/details/64087701, if you need to create a global DBLink, you need to first determine the user has the right to create DBLink:SELECT * from User_sys_privs where privilege like upper ('%database link% '); If not,

1. Check host name/IP, portThe host name/IP and port are recorded in the $oracle_home/install/portlist.ini file at the time of installation.The default is:General User Http://ip:5560/isqlplusDBA User Http://ip:5560/isqlplus/dbaEM Database Control

Today in the SOA application database using the Dbms_redefition package for the online non-partitioned table conversion partition table operation, I would like to drop off the temporary table cube_scope_temp accidentally forgot to add "temp"

Administrator Login StatementAccount must be added as SYSDBA for example: SYS as SYSDBAShow current user show users;Shows which users of the system have SELECT * from All_users;Creates a new user and authorizes the Create user user_name identified

Oracle Start monitoring error: The Listener supports no services Solveand ora-12514 The service issue is not registered. ORACLE11G Server Restart system, there are a few inexplicable error, the following is one, has been resolved. $ lsnrctl

Partitions can be partitioned by two fields, compare the first column first, and if satisfied, ignore the second column, and if the first one does not, you need to compare the second column. This partitioning approach is a bit hard to understand and

Preface: Oracle database comes with many users, such as SYSTEM, SYS, and Scott, but by default, Oracle only understands locks on 5 of these users: SYS, SYSTEM, Dbsnmp, Sysman, and Mgmt_view, respectively. Other users are locked. In order to learn

http://hutianci.iteye.com/blog/1457287L Example: Hit patch# 11843100:r12. Cac. BCheck to see if you already have this patch before you hit patch.SELECT * from Ad_applied_patches where patch_name in (' 11843100 ', ');SELECT * from ad_bugs where

Oracle Database defragmentation table Fragmentation reprint: Source of http://kyle.xlau.org/posts/table-fragmentation.html table fragmentsWhen there are many deletions for a table, the table generates a lot of fragmentation. The space freed by the

First, start the Oracle database and listenerFirst switch to Oracle private users:Su -1. Start the database:[Email protected] ~]$ Sqlplus/Nologsql*plus:release11.2.0.1.0Production on Wed Sep3 ,: -: + theCopyright (c)1982, the, Oracle. All rights

The first thing to know about Undo is that undo is a very useful feature in OracleThe undo data is also known as rollback (ROLLBACK) data, which is used to ensure consistency of data. When a DML operation is performed, the data before the

Time synchronization between nodes is important for Oracle and is often done by setting up an NTP server before the 11g release. In Oracle 11g, a new CTSS (Cluster time Synchronization Services, cluster synchronization Service) service was added to

Three methods for randomly generating data and three methods for generating data 1. Generate a random number using the Tree StructureSelect 1090900 + round (rownum/2 ),Round (dbms_random.value (100000,10001000), 0)From dualConnect by rownum2.

Database downtime migration oracle10g instance1. Operation 1.1 of the original database view original configuration 1.1.1 view User Permissions View user system permissions: SQL> select * from user_sys_privs; View User Roles SQL> select * from

Enable and disable Oraclecloudcontrol12c The entire installation of Oracle cloud control 12c is complicated. The installation path, logon password, port number, and many other configurations are confusing. This article describes how to obtain the

Oracle -- model usage, oraclemodel 1. What is a model statement? The model statement is a new feature of Oracle10g,The MODEL clause in SQL is an important new function introduced by Oracle 10g Database for the enterprise intelligence field. This

Detailed process of manually adding a tablespace In the RAC Environment 1. Node 1 (db01) check: [oraprod @ db01 archivelog] $ lsvg-l sharevg1 | grep lv16_41lv16_41 raw 128 128 1 closed/syncd N/A -- check whether the format and usage are raw or close,