find segment name from block in oracle

Many times, you might need to determine the segment name given the file id and block number. The below query can be used for that

SELECT segment_name, segment_type
FROM dba_extents
WHERE file_id = < file> AND
<block> BETWEEN block_id and block_id + blocks - 1;

Example

SELECT segment_name, segment_type FROM dba_extents WHERE file_id = 101 AND 8758758 BETWEEN block_id and block_id + blocks - 1;

You might want to use this query in conjunction with waits events to find the segment name

SELECT event, p1text,p1 “FILE”, p2text,p2 “BLOCK”, p3text,p3 “ID”
FROM gv$session_wait
WHERE event ='gc current request';
or
SELECT event, p1text,p1 “FILE”, p2text,p2 “BLOCK”, p3text,p3 “ID”
FROM gv$session_wait WHERE event ='gc buffer busy acquire';
Or
SELECT event, p1 “FILE”, p2 “BLOCK”, p3 “ID”
FROM v$session_wait
WHERE event = 'buffer busy waits';

Once block number and file id is known, we can find the segment using the below query
SELECT segment_name, segment_type
FROM dba_extents
WHERE file_id = <file id> AND
<block number> BETWEEN block_id and block_id + blocks - 1;

I hope you like this short post on find segment name from block in oracle

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