Number of blocks do not match

Hello

I thought the column of blocks in user_segments table resresents WHERE the number of total block of the table. Thus, in user_tables total table blocks and empty_blocks must be equal to the value of the block in user_segments WHERE. However, the following results do not give the correct result. My hypothesis is false?

Select a.blocks, b.blocks, b.empty_blocks from user_segments WHERE a, b from user_tables

where a.segment_name = b.table_name and = b.table_name'ANSWERS;

blocksblocks1empty_blocks
101376978170

What is the difference between these two blocks in tables user_segments and user_tables WHERE columns?

Thanks in advance.

XXX_SEGMENTS always displays the image in real time. So yes, you'll see xxx_segments.blocks change as soon as the new extent is allocated to the table. But xxx_tables.blocks, empty_blocks, avg_row_legth, etc. are only updated if gather you stats or analyze table (and some of them only via analyze).

SY.

Post edited by: SolomonYakobson

Tags: Database

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