Oracle

Match by single character querybegin DeclarecursorMyemp_cur is Select * fromTable_a AwhereA.type1='User'; type Myemp_tab is Table ofTable_a%rowtype;myemp_rd Myemp_tab;beginOpenmyemp_cur;loop --Cycle 1 FetchMyemp_curBulkCollect intoMYEMP_RD limit -;

# (c) 2003 BEA Systems, Inc. All rights Reserved.#ident "@ (#) Samples/atmi/simpapp/ubbsimple $Revision: 1.7 $"#Skeleton ubbconfig file for the TUXEDO simple application.#Replace the items with the appropriate values.*resourcesIpckey 123457

Vi/etc/sysconfig/network Modify the host name to OrcaleVi/etc/hosts Modifying mappingsip+ Host NameConfigure YumInstallationYum install binutils compat-libcap1 compat-libstdc++-33 compat-libstdc++-33 gcc gcc-c++ glibc glibc glibc-devel Glibc-dev El

Col VALUE format A20Select Parameter,value from nls_database_parameters where PARAMETER like '%characterset% ';PARAMETER VALUE--------------------------------------------------nls_characterset Al32utf8nls_nchar_cha Racterset AL16UTF16Select Userenv (

1, Row_number () over () sorting function:(1) Row_number () over () Grouping sorting function:When using the Row_number () over () function, the grouping in over () and the execution of the sort are later than the where group by order by.Partition

Select B.instance_number,B.SNAP_ID,A.begin_interval_time,A.end_interval_time,B.SQL_ID,B.plan_hash_value,B.parsing_schema_name,B.executions_delta,B.rows_processed_delta,Round (B.elapsed_time_delta/decode (B.executions_delta,0,1,b.executions_delta), 0)

1 environmentLocally (win7) the database where the DB1 is logged on through SQL developer, and then Dblink is created on the DB1, allowing direct access to the corresponding table on DB2DB1 machine: 10.196.9.72 "China intranet"Tns:zh_testapp2= of DB1

ORACLE database recursively queries all child data for current data (does not include itself)SELECT ID as ID, parent_id as ParentID, parent_id as parent, name as Textfrom mdm_center START with parent_id = #{parentid} CONNECT by prior id =

为了体验一下ORACLE 18C，一大早就上https://edelivery.oracle.com/osdc/faces/SoftwareDelivery 把安装介质弄了下来。先测试了下数据库软件的安装，按照官方安装文档里面提供的yum安装包配置方式没有成功，yum install oracle-database-server-18c-preinstall。查了下官方源http://yum.oracle.com/repo/OracleLinux/OL7/latest/x86_64/index.

Oracle Index TypeB-Tree IndexSpecific type IndexDetermining index ColumnsIndex of primary key and unique key value columnsFOREIGN Key IndexOther appropriate index columnsB-Tree index B-Tree index algorithmB-Tree refers to B-tree (Balanced tree), the

Summary of various problems encountered after oracle installation is complete. Basic commands: Logon command Sqlplus Sqlplus User Name Sqlplus user name/Password Sqlplus/nolog -- Account connection command Conn Conn User Name Conn username/password

Explain the oracle table complex query instances and explain the oracle instances Group by and having clauses Group by is used to group statistics on query results, The having clause is used to restrict group display results. Summary of data groups

Oracle lock Table query operation details, oracle lock table details -- 1. view the locked table: -- Select t2.username, t2.sid, t2.serial #, t2.logon _ time from -- V $ locked_object t1, v $ session t2 where t1.session _ id = t2.sid -- Order by t2.

Dual table instances used in oracle, mysql, and hive, dualhive The concept of dual table comes from oracle. dual is a virtual table, which is initialized together with the data dictionary when the database is created. This table has only one field

Why is undosql not displayed when oracle uses flashback ?, Flashbackundosql Why is undosql not displayed when oracle uses flashback? This is because oracle11g does not enable this function. Use the Administrator sys (that is, sysdba) to execute

OracleSQL optimization suggestions in actual development, oraclesql Optimization 1) Avoid Select * 2) try to use the same encoding style when writing SQL statements. Statement parsing, statement execution, and return execution results. Shared SGA

How to import scott to Oracle12C, oracle12cscott Oracle 12C has made great changes and has integrated SQLDeveloper for your convenience. scott users have been removed and can create and grant permissions if needed. This is a little basic ......

Common causes and solutions for Oracle deadlocks 1. deadlock caused by deletion and update The reason for the deadlock is that multiple threads or processes compete for or depend on the same resource. Here is an example of a deadlock caused by

Explain the usage of the oracle database scheduled task dbms_job, oracledbms_job1. knowledge points involved in dbms_job 1. Create a job: Variable jobno number; dbms_job.submit (: jobno, -- job number 'your _ procedure; ', -- stored procedure of

Oracle writes an explanation of saving data into Oracle after determining whether the content is weather. At the beginning of writing a program, I wrote an order processing system. All kinds of warehouse receiving, warehouse picking, order tracking,