Oracle

--determine if the table exists and delete if it existsDeclareNum Number; begin Select Count(1) intoNum fromAll_tableswheretable_name= 'EMP' andOWNER='SCOTT'; ifNum=1 Then ExecuteImmediate'drop table EMP'; End if; End; /

For unknown processes to crs_stop-f the process nameStart againCRS failed to start Crs_start-all Crs-0184:cannot communicate with the CRS daemon.Because Crs_start is an application-level directive, it fails when it starts CRS[Email protected] ~]$

View the current user's table space[SQL]View Plaincopy Select Username,default_tablespace from user_users; Modify the user default table space[SQL]View Plaincopy Alter user username default tablespace new table space;

Identify the current state of the system Model of the system server CPU the speed and quantity of Memory size I/O Equipment Situation Network status Number of system users and number of concurrent users Current system CPU

Before installing the ORACLE-ORACLIENT10G_HOME1 client, with ADO access no problem, after installing the ODP, the automatic installation of oracle-oraclient12home1, and then garbled into???。 Query conditions contain Chinese is not

Questions :Employee table: A (e_id,name,) Department table: B (d_id,d_name) employee-to-Department relationship: C (id,e_id,d_id)SELECT A.e_id,a.name, b.d_name from A INNER joins C on a.e_id=c.e_id INNER joins B on b.d_id=c.d_id;The record of such

ORACLE 11G features a new feature that does not allocate segment when the table has no data to save spaceWorkaround:　1, insert a row, and then rollback will produce segment.The method is to insert data into the empty table and then delete it,

If:Make changes to the table field type.For example, the table name is a, the field is A_namefield compatibility can be modified directly! In this case of incompatibility, there will be an error message:ORA-01439: To change the data type, the column

Oracle Archive logs are often full, represented as/oraarchive this file space occupies 100% people must complain about why Oracle does not have archive maintenance tools, many people directly delete the incident, wrong, Oracle has, and very smart,

Create or replace procedure Qianfeigl_jiaokuandy (Cebenh varchar2, Kehuh varchar2, Hetongh varchar2, v_cur out query_pkg. Query_cur)IsSqlstr VARCHAR2 (3000);Beginsqlstr:= ' Select A.S_CH,A.S_CID,C.S_HETONGH,A.D_CAOZUOSJ from Zw_yingyez a left joins

1, simple Query method of lock table statement Select from where t1.session_id = ORDER by T2.logon_time2, for the results of the above query to unlock, as shown belowAlter Kill ' 382,1125 '3, lock table detailed information querySelect dba_objects.

The first time you use SqlServer2012, the interface and VS2012 style are the same, great!To get to the point, this blog post mainly write a case of your own, using SqlServer2012 's "Import and export data" function to import data tables to oracle11g,

Connection sequence in the WHERE clause of Oracle performance optimization learning notes ORACLE uses the bottom-up sequence to parse the WHERE clause. According to this principle, the join between tables must be written before other WHERE

Oracle multi-key partition Test Partitions can be partitioned by two fields. The first column is compared first. If yes, the second column is ignored. If the first column is not met, the second column needs to be compared. This partitioning method

Shared SQL statement for Oracle performance optimization learning notesTo avoid repeated parsing of the same SQL statement, Oracle stores the SQL statement in memory after the first parsing. The memory in the shared buffer pool of the SGA

ORACLE -- partition table data cleaning, oracle -- Partition Table cleaning The tablespace is in a hurry because the partition table data is increased and no cleanup is performed. It takes a long time to clear data and release space. The procedure

Common Methods for viewing Oracle execution plans-Series 1 The SQL Execution Plan actually represents the specific execution steps of the target SQL in the Oracle database, only by knowing whether the execution plan selected by the optimizer is the

Oracle performance analysis 4: Full scan of data access methods During SQL statement execution, the Oracle optimizer determines the table access mode based on the statistical information. Generally, there are two basic data access methods: 1) Full

ORA-06575: the package or function NO_VM_DROP_PROC is invalidSQL> drop user aaa;Drop user aaaORA-00604: recursive SQL Level 1 errorORA-06575: the package or function NO_VM_DROP_PROC is invalidORA-06512: In line 21SQL> alter procedure WMSYS.

Upgrade rac10g10.2.0.1 to 10.2.0.5 Upgrade RAC 10.2.0.1 to 10.2.0.5 I. preparation: Patch package: p8202632_10205_LINUX.zip Number of nodes: 3 RAC1 RAC2 RAC3 Current node status Node 1: [Root @ rac1 bin] #./crs_stat-t Name Type Target State Host ----