logical database design

Today Sql-server database suddenly error:SQL Server detected a consistency-based logical I/O error checksum is incorrect (should be: 0x7c781313, but actually: 0X67A313C9). In the file ' C:\Program Files\Microsoft SQL Server\mssql.1\mssql\data\e_block_db.mdf ', the offset is 0x00000000a34000 in the location of the page in database ID 5 (1 : 1306) The error occurre

The ORACLE tutorial is the SH file of the logical backup of the Oracle database. Full backup SH file: exp_comp.sh Rq = 'date + "% m % d "' Su-oracle-c "exp system/manager full = y inctype = complete file =/oracle/export/db_comp $ rq. dmp" Cumulative backup SH file: exp_cumu.sh Rq = 'date + "% m % d "' Su-oracle-c "exp system/manager full = y inctype = cumulative file =/oracle/export/db_cumu $ rq. dmp" SH fi

The Oracle tutorial being looked at is the sh file of the Oracle database logical backup. SH file for full backup: exp_comp.sh rq= ' date + '%m%d ' SU-ORACLE-C "Exp System/manager full=y inctype=complete file=/oracle/export/db_comp$rq.dmp" SH file for cumulative backup: exp_cumu.sh rq= ' date + '%m%d ' SU-ORACLE-C "Exp System/manager full=y inctype=cumulative file=/oracle/export/db_cumu$rq.dmp" SH fil

. NextvalSYS as [email protected]>insert into HR. RSC VALUES (HR. Rsc_seq. Nextval, ' RSC ');SYS as [email protected]>select * from HR.RSC;rsc_id Rsc_name---------- --------------------2 RSCTo create a synonym:CREATE [public] synonym [SYS as [email protected]>create synonym HR. Hrgmy for HR. Gmy;To create a public synonym:CREATE public synonym Hrgmy for HR. Gmy;Use System view dba_synonyms to view information about synonyms (user_synonyms,all_synonyms)SYS as [email Protected]>desc dba_synonyms;N

spatial use of a hash cluster Scenario 167: Estimating the amount of space required for a hash cluster Scenario 168: Modifying and deleting a hash cluster Scenario 169: Using the Dba_cluster_hash_expressions view to view the hash function SELECT * from Dba_cluster_hash_expressions; Scenario 170: Creating a sequence CREATE SEQUENCE Hrman. emp_sMINVALUE 1NomaxvalueSTART with 1INCREMENT by 1NocycleCACHE 20; Scenario 171: Modifying a sequence ALTER SEQUENCE Hrman. emp_sMAXVALUE 10000; Scenario 172:

Now I don't know how to write a title every time I write it. How can I use concise languages to express the problems I want to solve? I guess this title will help you understand it for a long time. Let's explain it first. Now I don't know how to write a title every time I write it. How can I use concise languages to express the problems I want to solve? I guess this title will help you understand it for a long time. Let's explain it first. Now I don't know how to write a title every time I

⑤ Sort optimization (Order Optimizer) ( MySQL section support ) The order-by operation is usually done by index or sort (sort), and if the index is available, the sort operation can be omitted; ⑥ unique use (Exploiting uniqueness)(mysql support ) Use uniqueness, index and other features to check for unnecessary distinct operations For example: Perform the distinct operation on the primary key and, if

SQL Optimization-logical Optimization-database constraint rules and semantics optimization, SQL Semantics 1) database integrity ① Entity Integrity (Entity Integrity): yourself A) a link corresponds to an entity set in the real world. -- ER Model B) Entities in the real world have some unique identifiers. -- Primary key C) if the primary ke

Tags: Oracle database create alias synonymsEquivalent to alias (aliases), such as the User1.table1 in user2 to build a synonym table1Create synonym table1 for user1.table1;So when you check the user2 in the select * from table1 is equivalent to check select * from User1.table1;Advantages to summarize it yourself.For example:The management of the user in Oracle is managed using permissions, that is, if we want to use the

The example in this article describes how T-SQL statements modify SQL Server database logical names, database names, and physical names. Share to everyone for your reference, specific as follows: To change the physical file name of the MSSQL database SQL statement Note: In the activity Monitor, make sure there are no

[Start with n]//Start value, increment default is MinValue decrement is MaxValue[{MAXVALUE n | Nomaxvalue}]//maximum value[{MINVALUE n | Nominvalue}]//Minimum value[{CYCLE | Nocycle}]//Loop/No loop[{CACHE n | nocache}];//allocation and in-memoryConsiderations for modifying a sequence:L must be the owner of a sequence or have ALTER permission on a sequenceL only future sequence values will be changed.L Changing the initial value of a sequence can only be achieved by removing the sequence after it

You need to migrate the instance and data of DB2 to datavg (the original "DBA" is deployed to rootvg ...... so here I added quotation marks before and after the DBA) First, turn off all db2-related processes db2stop force and db2admin stop. Ps-eaf | grep-I db2 finds that some processes have not been shut down. No matter whether the file system is directly unmounted, device busy reports an error. Unmount/scomData successful Create an lv of the same size under datavg, create a file system, and

The ORACLE tutorial is the SH file of the logical backup of the Oracle database. Full backup SH file: exp_comp.sh Rq = 'date + "% m % d "' Su-oracle-c "exp system/manager full = y inctype = complete file =/oracle/export/db_comp $ rq. dmp" Cumulative backup SH file: exp_cumu.sh Rq = 'date + "% m % d "' Su-oracle-c "exp system/manager full = y inctype = cumulative file =/oracle/export/db_cumu $ rq. dmp" SH fi

Oracle442 application scenarios --------- database logical object management application scenarios Use Case 128: create a temporary table Create a temporary table temp_goods Create global temporary table temp_goods(GoodsId NUMBER,GoodsNum NUMBER,Price NUMBER)On commit delete rows; Create a temporary tablespace Create temporary tablespace tbs_t1TEMPFILE 'tbs _ t1.f' SIZE 50 m REUSE AUTOEXTEND ONMAXSIZE UNLIM