Internal LOBs – Oracle Certification

By -Porshica Hibbler

Table Partitioning Schemes-Partitioning

Posted on 20/06/2024
Posted in Certifications of Oracle, Data Warehouse Systems, Extended Datatypes, Internal LOBs, INTERVAL DAY TO SECOND, Reduced Administrative Burden

There are currently nine methods by which you can partition tables in Oracle: •\ Range partitioning: You may specify ranges of data that should be stored together. For example, everything that has a timestamp within the month of Jan-2014 will be stored in partition 1, everything with a timestamp within Feb-2014 in partition 2, and

By -Porshica Hibbler

Reduced Administrative Burden-Partitioning-2

Posted on 07/03/2024
Posted in Certifications of Oracle, Internal LOBs

This fails—we need sufficient free space in tablespace BIG1 to hold an entire copy of BIG_TABLE1 at the same time as the old copy is there—in short, we need about two times the storage for a short period (maybe more, maybe less—it depends on the resulting size of the rebuilt table). We now attempt the

By -Porshica Hibbler

ROWID/UROWID Types-Datatypes

Posted on 20/12/2023
Posted in Certifications of Oracle, Data Warehouse Systems, Internal LOBs

The last datatypes to discuss are the ROWID and UROWID types. A ROWID is the address of a row in a table (remember from Chapter 10 that it takes a ROWID plus a table name to uniquely identify a row in a database). Sufficient information is encoded in the ROWID to locate the row on

By -Porshica Hibbler

INTERVAL Type-Datatypes

Posted on 16/09/2023
Posted in Certifications of Oracle, Data Warehouse Systems, Extended Datatypes, Internal LOBs

We briefly saw the INTERVAL type used in the previous section. It is a way to represent a duration of time or an interval of time. There are two interval types we’ll discuss in this section: the YEAR TO MONTH type, which is capable of storing a duration of time specified in years and months,

By -Porshica Hibbler

Range Partitioning-Partitioning

Posted on 05/08/2023
Posted in Certifications of Oracle, Data Warehouse Systems, Extended Datatypes, Internal LOBs, INTERVAL DAY TO SECOND

The first type we will look at is a range partitioned table. The following CREATE TABLE statement creates a range partitioned table using the column RANGE_KEY_COLUMN. All data with a RANGE_KEY_COLUMN strictly less than 01-JAN-2021 will be placed into the partition PART_1, and all data with a value strictly less than 01-JAN-2022 (and greater than

By -Porshica Hibbler

TIMESTAMP WITH TIME ZONE Type-Datatypes

Posted on 28/07/2023
Posted in Certifications of Oracle, Data Warehouse Systems, Extended Datatypes, Internal LOBs, Reduced Administrative Burden

The TIMESTAMP WITH TIME ZONE type inherits all of the qualities of the TIMESTAMP type and adds time zone support.The TIMESTAMP WITH TIME ZONE type consumes 13 bytes of storage, with the extra 2 bytes being used to preserve the time zone information. It differs from a TIMESTAMP structurally only by the addition of these

By -Porshica Hibbler

INTERVAL DAY TO SECOND-Datatypes

Posted on 08/05/2023
Posted in Certifications of Oracle, Internal LOBs, Reduced Administrative Burden

The syntax for the INTERVAL DAY TO SECOND type is straightforward:INTERVAL DAY(n) TO SECOND(m) where N is an optional number of digits to support for the day component and varies from zero to nine, with a default of two. M is the number of digits to preserve in the fractional part of the seconds field

By -Porshica Hibbler

Read Consistency for LOBs-Datatypes

Posted on 06/02/2023
Posted in Certifications of Oracle, Internal LOBs, INTERVAL DAY TO SECOND, Reduced Administrative Burden

In previous chapters, we’ve discussed read consistency, multiversioning, and the role that undo plays in that. Well, when it comes to LOBs, the way read consistency is implemented changes. The LOBSEGMENT does not use undo to record its changes; rather, it versions the information directly in the LOBSEGMENT itself. The LOBINDEX generates undo just as

By -Porshica Hibbler

The “N” Variant-Datatypes

Posted on 14/09/2022
Posted in Certifications of Oracle, Extended Datatypes, Internal LOBs

So, of what use are the NVARCHAR2 and NCHAR (for completeness)? They are used in systems where the need to manage and store multiple character sets arises. This typically happens in a database where the predominant character set is a single-byte fixed-width one (such as WE8MSWIN1252), but the need arises to maintain and store some

By -Porshica Hibbler

Dates, Timestamps, and Interval Types-Datatypes

Posted on 09/09/2022
Posted in Certifications of Oracle, Extended Datatypes, Internal LOBs, Reduced Administrative Burden

The native Oracle datatypes of DATE, TIMESTAMP, and INTERVAL are closely related. The DATE and TIMESTAMP types store fixed date/times with varying degrees of precision. The INTERVAL type is used to store an amount of time, such as “8 hours” or “30 days,” easily. The result of subtracting two timestamps might be an interval; the