primary keys

As I mentioned earlier, sharding forces you to be keenly aware of primary keys, as you'll manage them yourself.

It is common for relational databases to use the concept of primary keys, generated by an auto-increment feature or by a sequence generator.

Wide primary keys are composed of two or more columns.

Sequential numbers are often used in OLTP-like applications to generate primary keys required by the relational model.

In replicated databases, the error is typically raised because primary keys have not been managed appropriately across the topology.

Automatically created indexes Adaptive Server Anywhere automatically creates indexes for primary keys and for unique constraints.

Primary keys are the unique identifiers for each row. They must contain unique values and cannot be null.

The two database systems support primary keys, along with key indices that allow you to speed up queries and constrain input.

If any of the tables are missing primary keys, those tables are altered to add ER shadow column keys that act as primary keys.

Of course, primary keys are never defined directly against views in a commercial relational database environment.

Relationships can be configured for cross-referencing primary keys between endpoints.

You use primary keys and foreign keys to describe relationships between the information in different tables.

Foreign keys prevent actions that would leave rows with foreign key values when there are no primary keys with that value.

Relationships, defined by the primary keys and foreign keys, tie together the information in relational database tables.

Clearly, the old rules regarding primary keys aren't in force here; so how does an object database deal with notions of uniqueness?

Master replicates require all nodes to access the master node to obtain the dictionary information about tables, columns, and primary keys.

One parameter is a collection of associative arrays that describe the database: table names, column names, primary keys, and foreign keys.

Both primary keys and cross-shard queries play a major role when sharding, mainly by defining what you can't do.

A one-to-one relationship is created if both of the related columns are primary keys or have unique constraints.

A template consists of schema information about a database, a group of tables, column attributes, and the primary keys that identify rows.

For more information on maintaining unique primary keys in a synchronization setup, see Maintaining unique primary keys.

Your database tables did not have primary keys defined, so you will set them now.

Primary keys are not required for tables in merge publications, but if a primary key column is present, it cannot be filtered.

Due to their importance in relational databases, Primary keys are the most fundamental aspect of all keys and constraints.

CGTTs do not support unique constraints or primary keys, but you can create a unique index.

You can only sign primary keys. Please check your selection.

Keys Properties. Such properties include setting primary keys, identities, and default values on each column.

A crude solution is to add a field to the Event bean containing the primary keys of all clients attending that particular event.

In the Join dialog box change the comparison operator between the primary keys as required.

Geronimo already supported auto-incrementing field primary keys and sequence table primary keys.

The types of indexes that will be needed, where required, and which columns are primary keys and which are foreign keys.

Learn about relational databases, data models, unique keys, primary keys, foreign keys, and table joins.

The metadata API also provides the ability to define nullable columns, establish primary keys, and set-up relationships between tables.

You do not need to create the primary keys, sample tables, and the privacy tables.

Although tables are not required to have primary keys, it is good practice to define them.

You provide the basis for joining related tables by establishing pairings of primary keys and foreign keys.

You can set primary keys, create and modify queries, add and remove relationships, and set a concurrency column.

Additionally , it rearranges the table rows so they appear in the order specified by the clustered index and primary keys .

We recommend that you always create indexes on primary keys.

Note: Enterprise replication requires that primary keys be defined on all tables.

For multiple-column primary keys, only the AllowDBNull property is automatically set to false.

Primary keys and foreign keys, while used primarily for validation purposes, can also improve database performance.

Includes declared referential integrity on the primary keys.

Logical primary keys (needed if a primary key is not defining in the underlying table or is not included in the view or named query).

Attempting to use this clause on tables without primary keys generates a syntax error.

Reducing the number of columns in your primary keys can improve performance.

You then use table relationships and primary keys to tell Access how to bring the information back together again.

Another major enhancement is the support for generating primary keys.

As will be explained later, these identifiers become primary keys within your tables.

Fortunately, dtd2sql can take the road of some commercial RDBMSs and simply eschew "natural" primary keys.

The DataSet also depicts the primary keys of the two tables.

Database structure change to remove search path from primary keys.

You then add foreign keys to related tables that reference those primary keys.

Keys view Allows defining primary keys, unique keys, and foreign keys.

Note that when tables without primary keys are used, only select and insert statements are generated.

You should not update primary keys in a SQL Remote installation.

It well avoids the table redundancy and the record repeat with the primary keys, the foreign keys and the table indexes.

Now XML transforms this to generate another XML document with the primary keys parameterized instead of hardcoded keys.

Annotations within a JPA entity can represent table columns, relationships to other tables, primary keys, and so on.

The secondary keys correspond with primary keys in other tables.

By default, Streamlined excludes special Rails fields such as foreign keys, primary keys, and timestamps, and includes the rest.

This is because primary keys and foreign keys are frequently used to join tables.

Then events with the same primary keys are in the same group and they are being delivered in an orderly way.

In the example data model, columns item_id and suppl_id are primary keys in the remote tables, items and supplier.

Parameter is a collection of database primary keys.

Stores data as 4-byte values; typically used in primary keys.

Object belongs must have an array of columns designated as primary keys.

As well as having primary keys, tables typically have some secondary keys.

Returns the foreign keys that reference primary keys on the table in the linked server.

You can also drop primary keys, indexes, and unique constraints from the update script.

At first, the events are divided into some groups by primary keys in the business objects.

Provides access to common queries based on primary keys, foreign keys, and indexes.

Primary keys are not generated on fact tables.

Indexes are not just for the primary keys or the unique keys.

Needs the correct identification of the primary keys of the table in order to work correctly.

You use a dynamic relationship to correlate data based on primary keys.

This is because a group with the same primary keys raises one thread of event delivery.

The primary keys used are random 18-digit integers.

Variables for fields such as primary keys were duplicated from entity to entity.

The following example illustrates how primary keys can make queries execute more quickly.

First, we map a real one-to-one association using shared primary keys:

Conflicts do not apply to primary keys

Cannot Script Full-Text Indexes for Tables with No Primary Keys Even if Another Unique Index Exists

Therefore, the primary keys that are chosen must follow the rules for

IAnywhere. Com - Ensuring unique primary keys

Note that primary keys and unique constraints are added to the

Specifications for all primary keys and foreign keys

For information about primary keys, see

How can you create Logical ties between tables. primary keys and foreign keys

Defining Logical Primary Keys in a Data Source View (Analysis Services)

Defining Logical Primary Keys in a Data Source View