TABLE-Anweisung definieren oder Spalten mit ALTER TABLE ändern • deklarieren oder ändern Sie eine Domäne mit den Anweisungen CREATE DOMAIN oder ALTER DOMAIN • lokale Variablen in Stored Procedures, PSQL-Blöcken Skalarfunktionen. Chapter 3. Datentypen und Untertypen 46 Casting auf eine Domain Beim Casting in eine Domäne werden alle dafür deklarierten Constraints berücksichtigt, d. h. NOT NULL- oder CHECK-Constraints Umwandlung fehl. Wenn zusätzlich TYPE OF angegeben wird — Umwandlung in seinen Basistyp — werden alle Domäneneinschränkungen während der Umwandlung ignoriert. Wird TYPE OF mit einem Zeichentyp (CHAR/VARCHAR)

NULL | } | DROP DEFAULT}] [{SET | DROP} NOT NULL] [{ADD [CONSTRAINT] CHECK (<dom_condition>) | DROP CONSTRAINT}] [{TYPE }]; Типы данных 57 CREATE DOMAIN name [AS] [DEFAULT {literal | NULL | }] [NOT NULL] [CHECK (<dom_condition>)] [COLLATE collation]; ::= {SMALLINT | INT[EGER] | BIGINT} [] [CHARACTER SET charset] | BLOB [(seglen [, subtype_num])] ::= [[x:]y [,[x:]y ...]] <dom_condition> ::= { | [NOT] BETWEEN AND | [NOT]

NULL | } | DROP DEFAULT}] [{SET | DROP} NOT NULL ] [{ADD [CONSTRAINT] CHECK (<dom_condition>) | DROP CONSTRAINT}] [{TYPE }] Example ALTER DOMAIN STORE_GRP SET DEFAULT CREATE DOMAIN name [AS] [DEFAULT { | NULL | }] [NOT NULL] [CHECK (<dom_condition>)] [COLLATE collation_name] ::= | | ::= !! See BLOB Data Types Syntax !! ::= !! See Array Data Types Syntax !! <dom_condition> ::= Chapter 5. Data Definition (DDL) Statements 120 |

and out‐ side the transaction, the round‐ robin strategy is used to route to the replica RAN‐ DOM Within the transaction, read query are routed to the primary, and out‐ side the transaction, the espl itti ng.a lgor ithm .loa dbal ance .Rou ndRo binR eadQ uery Load Bala nceA lgor ithm RAN DOM the read database load balancer algorithm based on random or g.ap ache .sha rdin gsph ere. read a lgor ithm .loa dbal ance .Wei ghtR eadQ uery Load Bala nceA lgor ithm TRA NSA CTI ON_ RAN DOM Whether in a transaction or not, read requests are routed to multiple replicas using a random strat‐

Transactions and Notifications, which de- scribed Percolator: a Google-internal database for ran- dom access transactional workloads where low laten- cies are not required. Percolator uses a global co-

Zugriffsschicht Verschiedene Datenbankentwicklungsbibliotheken fragen Metadaten wie Primärschlüssel, Domäne und ähnliche Strukturinformationen ab, um die Entwicklung von Clientanwendungen zu vereinfachen

bibliotecas de acesso a banco de dados fazem consultas aos metadados da tabela, como chave primária, domínio e outras informações da estrutura, visando tornar o desenvolvimento das aplicações clientes uma

espl itti ng.a lgor ithm .loa dbal ance .Rou ndRo binR eadQ uery Load Bala nceA lgor ithm RAN DOM the read database load balancer algorithm based on random or g.ap ache .sha rdin gsph ere. read a lgor ithm .loa dbal ance .Wei ghtR eadQ uery Load Bala nceA lgor ithm TRA NSA CTI ON_ RAN DOM Whether in a transaction or not, read requests are routed to multiple replicas using a random strat‐ adba lanc e.Tr ansa ctio nWei ghtR eadQ uery Load Bala nceA lgor ithm FI XED _RE PLI CA_ RAN DOM Open transaction, and the read request is routed to a fixed replica using a random strategy; if the

and improvements Loïc Chapeaux rewrote and optimized JavaScript, DHTML and DOM stuff rewrote the scripts so they fit the PEAR coding standards and generate XHTML1.0 and CSS2 compliant