multi tenant database architecture oracle 12c

Tags: memory structure alt lock launch key data file 10g binary file metadata1. What is the relational database? A relational model is a model of a database created by a relational model and a two-dimensional table to store data. Oracle,mysql,sqlserver 2. What is a NoSQL database? Key-value Saving a

To understand the Oracle architecture, you must first understand two basic concepts: databases and instances. 　　I. Database A database is a collection of data. Whether the database adopts a relational structure or an object-oriented structure, the

for Oracle databases under Linux:$ps-ef|grep Ora_Oracle logical Structure of a database:an Oracle database consists of one or more tablespace (tablespaces)---> Each tablespace contains multiple or one segment (segments)----> Each segment (segment) contains one or more extent (zones)----> each extent (Zone) contains one or more blocks.Oracle's Tablespace (table s

Oracle multi-database data is updated at the same time 1. Create dblink Create database link test connect to mall identified by test using'(DESCRIPTION =(ADDRESS_LIST =(ADDRESS = (PROTOCOL = TCP) (HOST = 113.116.216.60) (PORT = 1521 )))(CONNECT_DATA =(SERVICE_NAME = orcl)))'; 2. Create a synonym Create or replace synon

Servlet+oracle MVC architecture to build a simple shopping cart Web projectThe main implementation of the following features:1. User login, verify the legality of the user from the database.2. The shopping hall, take out the product from the database to display.3. In the shopping hall you can click on the purchase item

);V_saledate date;V_productId number (10 );V_num varchar (40 );BeginSelect sale_record_seq.nextval into: new. id from dual;V_ID: =: new. id;V_storeId: =: new. storeId;V_saledate: =: new. saledate;V_productId: =: new. productId;V_num: =: new. num;Insert into sale_record @ mall (id, storeId, saledate, productId, num) values (v_ID, v_storeId, v_saledate, v_productId, v_num );End addSaleRecords; Test: Add data to the local table: Insert into sale_record (id, storeId, saledate, productId, num) value

Conceptual Mode: Conceptual mode, also known as pattern, is a description of the global data base structure in the database, and is the public view of the whole user. This description is abstract, does not involve specific hardware environments and platforms, and is not related to a software environment. external mode: External mode is also called sub-mode or user mode, he is the database user can

option is 16. All options including advance is 70. For Oracle, show parameter would display all the options. There is many advance options and most of the time, we don ' t really need to change it unless it's asked by Oracle support. Oracle MSSQL List All Parameters Show parameter sp_configure

There are many backup methods for Oracle databases, including industry-recognized cold backups, hot backups, and so on, but regardless of which backup method is used, the purpose of the backup is to recover the system at the lowest possible time and cost in the event of a failure. Unfortunately, Oracle seems to have not done much layout in the cloud at the moment the cloud concept emerges. If you want to ba

Oracle database system is a complex software system. Oracle architecture refers to the components of an Oracle database management system and the interrelationships between these components, including memory structure, background

Oracle inserts multiple tables. Most insert operations are for a single table. However, oracle supports insert statements for multiple tables. Data Warehouse Extraction Oracle inserts multiple tables. Most insert operations are for a single table. However, oracle supports insert statements for multiple tables. Data Wa

multipath configuration is correct. The information is as follows:[[Emailprotected]~]#fdisk-l ...] disk/dev/mapper/mpathb:2684.4gb,2684354560000bytesheads,63 sectors/track,326354cylindersunits=cylindersof16065*512= 8225280bytesSectorsize (logical/physical):512bytes/512 bytesi/osize (Minimum/optimal): 512bytes/512bytesdiskidentifier: 0x00000000deviceboot StartEnd BlocksIdSystem/dev/mapper/mpathbp1 1 2673502147483647+eegpt ...The above information can be found in the GPT partition format, the nex

After work, have been busy with the front-end development; Basically forget, all of Oracle's things; think back to the original "DBA" dream; Consider the present situation, long story, filled with emotion; In order to pick up the knowledge of the database, have been looking at the blog of Daniel; In order to deepen the memory, it and review , the following will continue to extract Daniel's blog content; merely;Here is an

Tags: ble learning entry Good type programming AMP data arc --20170322 --1.0 --Update the statistics of the tableBeginDbms_stats.set_table_stats (user, ' EMP ', numrows = 10000);EndBeginDbms_stats.set_table_stats (user, ' DEPT ', numrows = 10000);End--Re-view the statistics of the tableSelect T.table_name,t.num_rows,t.blocks from User_tables t where T.table_name in (' EMP ', ' DEPT ');/*DEPT 10000 100EMP 10000 100*/ --2.0 --View the number of blocks of data occupied by the index, cluster factor

Join on: Multi-Table AssociationInternal connections: Connecting to other tablesFrom table 1 T join table 2 s on t. Field 1 =s. field 2 join table 3 N on N. field 3=t. field 1 or from table 1 A, table 2 B, table 3c where a. field =b. field　　Self-connect: connect to itselfFrom table 1 T join table 1 s on t. Field 1 =s. field 1 S. field 1=t. Field 1Outer connection: Left/Right connection the LEFT join is guaranteed that the data on the left

Oracle fragmentation key points-Multi-table joint query, collect basic database information 1. multi-table join query for oracle: www.2cto.com select. sname, B. stu_xb from student a, studentinf B where. stu_id = B. stu_id syntax 2. SQLStructur query language structured quer

Label:SELECT * FROM (SELECT Tt.*,rownum RN from(SELECTa.case_id as Treatid,A.type as TYPE,B.content as CONTENT,b.add_user_id as Adduserid,B.add_user_type as Addusertrpe,A.create_time as Createtime,B.check_time as Checktime,E.addusertypeFrom T_medical_case ALeft JOIN t_treatment B on a.case_id = b.treat_idLeft JOIN (select c.patient_id as ID, C.user_name, ' 2 ' as AddusertypeFrom T_patient_info CUNIONSelect d.doctor_id as ID, D.user_name, ' 1 ' as AddusertypeFrom T_doctor_info D) E on b.add_user_

will show null! SQL syntax Format: Syntax 1:Select* fromtable 1 LEFT OUTER join Table 2 on table 1. Field 1=table 2. Field 1; Syntax 2:Select* fromtable 1 LEFT OUTER join table 2whereTable 1. field 1= table 2. Field 1 (+); 2, right outer connection: RIGHT outer join effect: All data in the table on the left will be displayed, but the data on the table And the fields on the right match will be queried! Otherwise it will show null! SQL syntax Format: Syntax 1:Select* fromtable 1 Right

Label:Create or replace procedure test(jf_id in Nvarchar2,yf_id in Nvarchar2)AsV_length Number: = Length (yf_id);V_start number: = 1;V_index number;Beginwhile (V_start LOOPV_index: = INSTR (yf_id, ', ', v_start);IF V_index = 0ThenDbms_output.put_line (SUBSTR (yf_id, V_start));V_start: = v_length + 1;ELSEDbms_output.put_line (SUBSTR (yf_id, V_start, V_index-v_start));V_start: = V_index + 1;END IF;END LOOP;ExceptionWhen others thenRollback;End;A multi-I

(+)----results equivalent to outer joinsUse of data dictionariesSelf-connect (cheat yourself): select * from Z_course C1, Z_course C2 where C1.cour_code=c2.p_cour_codeHierarchical queryConnect by PRIOR Connection condition start with start condition　　　　　　　　　　　　SELECT * FROM Z_course t connect by prior T.cour_code=t.p_cour_code start with t.cour_name like '% International 'Pseudo-column:Level: plus a column of display levels　　　　　　　　　　　　　　Select t.*, level from Z_course t connect by prior T.cour_