There are two types of ordered indices: dense and sparse. A dense index contains an index record for every search key value with a pointer to the actual record, while a sparse index only creates index records for some records and sequential searching is needed to find the desired record. Dense indices require more space but allow faster access, making them preferable for secondary indices or when the index is small compared to memory.
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How the non-dense index worksHow the non-dense index works.pdfarjunstores123
How the non-dense index works?
How the non-dense index works?
Solution
Dense Index:
An index record appears for every search key value in file.
This record contains search key value and a pointer to the actual record.
This makes searching faster but requires more space to store index records itself. Index
records contain search key value and a pointer to the actual record on the disk.
A non-dense index has:
One entry for each block
One entry for each different value
Sparse Index is non-dense index
In sparse index, index records are not created for every search key. An index record here
contains a search key and an actual pointer to the data on the disk. To search a record, we first
proceed by index record and reach at the actual location of the data. If the data we are looking for
is not where we directly reach by following the index, then the system starts sequential search
until the desired data is found..
Indexing is used to speed up access to desired data.
E.g. author catalog in library
A search key is an attribute or set of attributes used to look up records in a file. Unrelated to keys in the db schema.
An index file consists of records called index entries.
An index entry for key k may consist of
An actual data record (with search key value k)
A pair (k, rid) where rid is a pointer to the actual data record
A pair (k, bid) where bid is a pointer to a bucket of record pointers
Index files are typically much smaller than the original file if the actual data records are in a separate file.
If the index contains the data records, there is a single file with a special organization.
How the non-dense index worksHow the non-dense index works.pdfarjunstores123
How the non-dense index works?
How the non-dense index works?
Solution
Dense Index:
An index record appears for every search key value in file.
This record contains search key value and a pointer to the actual record.
This makes searching faster but requires more space to store index records itself. Index
records contain search key value and a pointer to the actual record on the disk.
A non-dense index has:
One entry for each block
One entry for each different value
Sparse Index is non-dense index
In sparse index, index records are not created for every search key. An index record here
contains a search key and an actual pointer to the data on the disk. To search a record, we first
proceed by index record and reach at the actual location of the data. If the data we are looking for
is not where we directly reach by following the index, then the system starts sequential search
until the desired data is found..
Indexing is used to speed up access to desired data.
E.g. author catalog in library
A search key is an attribute or set of attributes used to look up records in a file. Unrelated to keys in the db schema.
An index file consists of records called index entries.
An index entry for key k may consist of
An actual data record (with search key value k)
A pair (k, rid) where rid is a pointer to the actual data record
A pair (k, bid) where bid is a pointer to a bucket of record pointers
Index files are typically much smaller than the original file if the actual data records are in a separate file.
If the index contains the data records, there is a single file with a special organization.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
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It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
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Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
The Indian economy is classified into different sectors to simplify the analysis and understanding of economic activities. For Class 10, it's essential to grasp the sectors of the Indian economy, understand their characteristics, and recognize their importance. This guide will provide detailed notes on the Sectors of the Indian Economy Class 10, using specific long-tail keywords to enhance comprehension.
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Sectors of the Indian Economy - Class 10 Study Notes pdf
Physical Storage Media (Cont.pptx
1. 1
Dense and Sparse Indices
There are Two types of ordered indices:
Dense Index:
• An index record appears for every search key value in file.
• This record contains search key value and a pointer to the actual
record.
Sparse Index:
• Index records are created only for some of the records.
• We start at that record pointed to by the index record, and proceed
along the pointers in the file (that is, sequentially) until we find the
desired record.
2. Figures 1 and 2 show dense and sparse indices for the deposit file.
Figure 1: Dense index.
•Notice how we would find records for Perryridge branch using both methods.
Figure 2: Sparse index.
2
3. 3
Index Choice
• Dense index requires more space overhead and more
memory.
• Data can be accessed in a shorter time using Dense
Index.
• It is preferable to use a dense index when the file is
using a secondary index, or when the index file is
small compared to the size of the memory.