There are several indexing techniques that can optimize system performances. The choice of the right index type in a schema can improve the DB performances by up to 80%. Unfortunately the illustrations of the various ...There are several indexing techniques that can optimize system performances. The choice of the right index type in a schema can improve the DB performances by up to 80%. Unfortunately the illustrations of the various techniques are scattered over a number of texts and manuals, and the courses for database designers are often somewhat incomplete. The present paper shows a didactical experience which tackles this kind of limitations. In particular, the authors have prepared a textbook that includes twenty-one different index formats; it discusses advantages and disadvantages of each indexing technique, and has been positively validated during advanced courses on relational database design.展开更多
An outsource database is a database service provided by cloud computing companies.Using the outsource database can reduce the hardware and software＇s cost and also get more efficient and reliable data processing capa...An outsource database is a database service provided by cloud computing companies.Using the outsource database can reduce the hardware and software＇s cost and also get more efficient and reliable data processing capacity.However,the outsource database still has some challenges.If the service provider does not have sufficient confidence,there is the possibility of data leakage.The data may has user＇s privacy,so data leakage may cause data privacy leak.Based on this factor,to protect the privacy of data in the outsource database becomes very important.In the past,scholars have proposed k-anonymity to protect data privacy in the database.It lets data become anonymous to avoid data privacy leak.But k-anonymity has some problems,it is irreversible,and easier to be attacked by homogeneity attack and background knowledge attack.Later on,scholars have proposed some studies to solve homogeneity attack and background knowledge attack.But their studies still cannot recover back to the original data.In this paper,we propose a data anonymity method.It can be reversible and also prevent those two attacks.Our study is based on the proposed r-transform.It can be used on the numeric type of attributes in the outsource database.In the experiment,we discussed the time required to anonymize and recover data.Furthermore,we investigated the defense against homogeneous attack and background knowledge attack.At the end,we summarized the proposed method and future researches.展开更多
We are pleased to announce that Acta Pharmaceutica Sinica B(APSB)has been selected for coverage in the Science Citation Index Expanded(SCIE),online at the Web of Knowledge.Coverage of this title in SCIE is underway be...We are pleased to announce that Acta Pharmaceutica Sinica B(APSB)has been selected for coverage in the Science Citation Index Expanded(SCIE),online at the Web of Knowledge.Coverage of this title in SCIE is underway beginning with Vol.5 No.1,2015.The title will be dropped from the Emerging Sources Citation Index(ESCI)and moved to the new database in several weeks.展开更多
We are pleased to announce that Acta Pharmaceutica Sinica B(APSB)has been selected for coverage in the Science Citation Index Expanded(SCIE),online at the Web of Knowledge.Coverage of this title in SCIE is underway be...We are pleased to announce that Acta Pharmaceutica Sinica B(APSB)has been selected for coverage in the Science Citation Index Expanded(SCIE),online at the Web of Knowledge.Coverage of this title in SCIE is underway beginning with Vol.5 No.1,2015.The title will be dropped from the Emerging Sources Citation Index(ESCI)and moved to the new展开更多
We are pleased to announce that Acta Pharmaceutica Sinica B(APSB)has been selected for coverage in the Science Citation Index Expanded(SCIE),online at the Web of Knowledge.Coverage of this title in SCIE is underway be...We are pleased to announce that Acta Pharmaceutica Sinica B(APSB)has been selected for coverage in the Science Citation Index Expanded(SCIE),online at the Web of Knowledge.Coverage of this title in SCIE is underway beginning with Vol.5 No.1,2015.The title will be dropped from the Emerging Sources Citation Index(ESCI)and moved to the new展开更多
We are pleased to announce that Acta Pharmaceutica Sinica B(APSB)has been selected for coverage in the Science Citation Index Expanded(SCIE),online at the Web of Knowledge.Coverage of this title in SCIE is underway be...We are pleased to announce that Acta Pharmaceutica Sinica B(APSB)has been selected for coverage in the Science Citation Index Expanded(SCIE),online at the Web of Knowledge.Coverage of this title in SCIE is underway beginning with Vol.5 No.1,2015.The title will be dropped from the Emerging Sources Citation Index(ESCI)and moved to the new database in several weeks.展开更多
We are pleased to announce that Acta Pharmaceutica Sinica B(APSB)has been selected for coverage in the Science Citation Index Expanded(SCIE),online at the Web of Knowledge.Coverage of this title in SCIE is underway be...We are pleased to announce that Acta Pharmaceutica Sinica B(APSB)has been selected for coverage in the Science Citation Index Expanded(SCIE),online at the Web of Knowledge.Coverage of this title in SCIE is underway beginning with Vol.5 No.1,2015.The title will be dropped from the Emerging Sources Citation Index(ESCI)and moved to the new database in several weeks.展开更多
文摘There are several indexing techniques that can optimize system performances. The choice of the right index type in a schema can improve the DB performances by up to 80%. Unfortunately the illustrations of the various techniques are scattered over a number of texts and manuals, and the courses for database designers are often somewhat incomplete. The present paper shows a didactical experience which tackles this kind of limitations. In particular, the authors have prepared a textbook that includes twenty-one different index formats; it discusses advantages and disadvantages of each indexing technique, and has been positively validated during advanced courses on relational database design.
文摘An outsource database is a database service provided by cloud computing companies.Using the outsource database can reduce the hardware and software＇s cost and also get more efficient and reliable data processing capacity.However,the outsource database still has some challenges.If the service provider does not have sufficient confidence,there is the possibility of data leakage.The data may has user＇s privacy,so data leakage may cause data privacy leak.Based on this factor,to protect the privacy of data in the outsource database becomes very important.In the past,scholars have proposed k-anonymity to protect data privacy in the database.It lets data become anonymous to avoid data privacy leak.But k-anonymity has some problems,it is irreversible,and easier to be attacked by homogeneity attack and background knowledge attack.Later on,scholars have proposed some studies to solve homogeneity attack and background knowledge attack.But their studies still cannot recover back to the original data.In this paper,we propose a data anonymity method.It can be reversible and also prevent those two attacks.Our study is based on the proposed r-transform.It can be used on the numeric type of attributes in the outsource database.In the experiment,we discussed the time required to anonymize and recover data.Furthermore,we investigated the defense against homogeneous attack and background knowledge attack.At the end,we summarized the proposed method and future researches.
文摘We are pleased to announce that Acta Pharmaceutica Sinica B(APSB)has been selected for coverage in the Science Citation Index Expanded(SCIE),online at the Web of Knowledge.Coverage of this title in SCIE is underway beginning with Vol.5 No.1,2015.The title will be dropped from the Emerging Sources Citation Index(ESCI)and moved to the new database in several weeks.
文摘We are pleased to announce that Acta Pharmaceutica Sinica B(APSB)has been selected for coverage in the Science Citation Index Expanded(SCIE),online at the Web of Knowledge.Coverage of this title in SCIE is underway beginning with Vol.5 No.1,2015.The title will be dropped from the Emerging Sources Citation Index(ESCI)and moved to the new
文摘We are pleased to announce that Acta Pharmaceutica Sinica B(APSB)has been selected for coverage in the Science Citation Index Expanded(SCIE),online at the Web of Knowledge.Coverage of this title in SCIE is underway beginning with Vol.5 No.1,2015.The title will be dropped from the Emerging Sources Citation Index(ESCI)and moved to the new
文摘We are pleased to announce that Acta Pharmaceutica Sinica B(APSB)has been selected for coverage in the Science Citation Index Expanded(SCIE),online at the Web of Knowledge.Coverage of this title in SCIE is underway beginning with Vol.5 No.1,2015.The title will be dropped from the Emerging Sources Citation Index(ESCI)and moved to the new database in several weeks.
文摘We are pleased to announce that Acta Pharmaceutica Sinica B(APSB)has been selected for coverage in the Science Citation Index Expanded(SCIE),online at the Web of Knowledge.Coverage of this title in SCIE is underway beginning with Vol.5 No.1,2015.The title will be dropped from the Emerging Sources Citation Index(ESCI)and moved to the new database in several weeks.
