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INTRO. TO DATABASE MGMT. SYST.

INTRO. TO DATABASE MGMT. SYST.

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It requires a dense index to be built on top of the data file.

It is built on non-key columns and does not reflect the physical order of data.

It maintains the physical order of records in the table based on the index key.

It always uses a sparse index structure regardless of the file organization.

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Using a hash-based file organization

Increasing disk cache size

Using a smaller page size to reduce memory footprint

Prefetching and read-ahead strategies

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USB 3.0

SATA

NVMe PCIe

SAS

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The page ID of the next block

Actual tuple data

Number of total pages in the file

Record offsets within the page

Reduced disk seek time

Optimized analytical query performance

Better support for ACID transactions

Faster transactional updates

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Reduced disk seek time

❌

Optimized analytical query performance

✅

Better support for ACID transactions

❌

Faster transactional updates

❌

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Heap files

B+ trees

100%

Log-structured storage

Slotted-page format

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It eliminates the need for any secondary indexes on the table.

It can significantly reduce I/O operations by keeping related data physically close together.

It does not affect the physical storage order of records in any way.

It always leads to faster point queries but can slow down range queries.

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