What is SQL driver table?

Posted on by David Darling

What is SQL driver table?

The driving table is the table that is joined to other tables in an SQL query and the first table accessed when a query will run. This understanding will help you tune your Query in a better way. It’s not like that your driving table will always be the first table in your From clause.

What is driving table in database?

In Oracle, the driving table is the table that is joined to other tables in an SQL query. Understanding how Oracle identifies the driving table can help you make better tuning decisions.

What is Obiee 11g driving table?

Driving Table in OBIEE 11g is used to optimize the manner in which the processes of the Oracle BI Server cross-database joins in the situation wherein one of the tables in extremely small while the other is large. The BI server then queries the small table (the driving table) to get the required list of values.

How do I connect to ODBC in SQL Developer?

Configuring ODBC

  1. Click on Start, Settings, Control Panel.
  2. Double-click on the ODBC Data Sources icon.
  3. Select MS Access Database from the list, and click the Configure button.
  4. Assign a name to the database.
  5. Assign a description about the connection.
  6. Click on the Select button.

What is ordered hint in Oracle?

ORDERED. The ORDERED hint causes Oracle to join tables in the order in which they appear in the FROM clause. If you omit the ORDERED hint from a SQL statement performing a join, then the optimizer chooses the order in which to join the tables.

What is collection in Oracle with example?

PL/SQL – Collections

Collection Type Number of Elements Where Created
Associative array (or index-by table) Unbounded Only in PL/SQL block
Nested table Unbounded Either in PL/SQL block or at schema level
Variablesize array (Varray) Bounded Either in PL/SQL block or at schema level

How do I install Oracle ODBC drivers?

Installing Oracle Instant Client ODBC

  1. Download Install the Instant Client Basic or Basic Light package as described above.
  2. Download the Instant Client ODBC package.
  3. Install the unixODBC driver manager if it is not already available.
  4. Execute odbc_update_ini.sh from the Instant Client directory.

How do I create an Oracle ODBC driver?

Configuring an Oracle ODBC Data Source Name

  1. In the Windows Control Panel, double-click Administrative Tools.
  2. Double-click Data Sources (ODBC).
  3. Select the System DSN tab and click Add.
  4. Select an appropriate Oracle driver and click Finish.
  5. Specify the following information in the Oracle ODBC Driver Configuration window:

What is full table scan in Oracle?

A full table scan (also known as a sequential scan) is a scan made on a database where each row of the table is read in a sequential (serial) order and the columns encountered are checked for the validity of a condition.

How many types of collections are there in Oracle?

three
Oracle provides three basic collections, each with an assortment of methods.

What is cardinality in Obiee?

Cardinality is one of the key defining parameter in logical joins. Cardinality relation one-to-many means that each row in first logical dimension table there are 0, 1, many rows in second logical table.

What is cardinality SQL?

In SQL (Structured Query Language), the term cardinality refers to the uniqueness of data values contained in a particular column (attribute) of a database table. The lower the cardinality, the more duplicated elements in a column.

Where is Oracle ODBC driver installed?

Setup ODBC [top]

  1. Download the latest ODBC zip package from the Oracle instant client download site:
  2. Unzip the ODBC zip package into the instantclient_X_Y folder where you installed the OCI drivers:
  3. Open a command prompt as administrator:
  4. Terminal Command: Install ODBC: cd c:\Oracle\instantclient* odbc_install.exe.

How do I check my Oracle drivers?

To find out what Oracle ODBC drivers are installed on your Windows system, you can use the ODBC manager to look at them:

  1. Go to Control Panel.
  2. Go to Administrative Tools.
  3. Run Data Sources (ODBC).
  4. Go to System DSN tab.
  5. Click the Add button.

What is the driving table in Oracle?

In Oracle, the driving table is the table that is joined to other tables in an SQL query. Understanding how Oracle identifies the driving table can help you make better tuning decisions.

What is the driving table in Oracle hash join?

Oracle also uses the term driving table when talking about the driving table in a hash join. Make sure that the smaller table is the driving table (the first table in the from clause when using the ordered hint). This is because a hash join builds the memory array using the driving table.

Which table comes first in Oracle SQL Server?

Oracle loads the driving table into a hash table first, then looks up each row in this hash table in the inner table. So, the smaller table should be first, or the driving table. Make sure both sides of the join condition have the same data type, not just the same data type family.

Is the Oracle ODBC driver capable of the sqlsetstmtattr function?

By default, the Oracle ODBC Driver supports the SQL_ATTR_QUERY_TIMEOUT attribute for the SQLSetStmtAttr function. If this box is not checked, the Oracle ODBC Driver responds with a “not capable” message.