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Tc Tablespace Checkpoint

On a quick test, I saw that 8i, 9i, and 10g show the query coordinator waiting on a TC (tablespace checkpoint ) event, and a couple of TC enqueues being taken out.

But no sign of a segment specific checkpoint.

This occured when I had 16 partitions which should have been dirty – so I was looking for 16 of ‘something’ to appear in the stats somewhere.

, TC-Tablespace Checkpoint 81 81 0 27 4,016 148,740741.

TQ-Queue table enqueue 19878 19878 0 16 3,596 224,75.

CF-Controlfile Transaction 308733 308732 1 2 ,692 346.

The script output shows activity statistics for particular types of enqueues which allows users to find the enqueues that cause most waits and wait times.

, — jkstill 07/16/2010 – use audit_actions table to resolve commands (eliminate decode), GitHub Gist: instantly share code, notes, and snippets.

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, TC: Tablespace Checkpoint : Lock held to guarantee uniqueness of a tablespace checkpoint : TD: KTF map table enqueue: Serializes updates and inserts to the SMON_SCN_TIME mapping table: TE: KTF broadcast: Serializes broadcasts for flushes to SMON_SCN_TIME: TF: Temporary File: Serializes dropping of a temporary file: TH: Threshold Chain, 07/07/2008 TC-Tablespace Checkpoint 3 3 0 1 4 4,030.

00 TX-Transaction (index contention) 1,261 1,261 0 2 0 145.

00.

Begin backup commands should trigger a checkpoint for all the blocks of the tablespace files to be written to the disk, which would trigger DBWR to work harder; DBWR can trigger LGWR to do log file sync.

, TC-Tablespace Checkpoint 81 81 0 27 4,016 148,740741.

TQ-Queue table enqueue 19878 19878 0 16 3,596 224,75.

CF-Controlfile Transaction 308733 308732 1 2 ,692 346.

, 15/03/2017 DBWR checkpoint buffers written 323,830 89.

9 3.

3.

DBWR checkpoints 18 0.

0 0.

0.

DBWR object drop buffers written 298 0.

1 0.

0.

DBWR parallel query checkpoint b 0 0.

0 0.

0.

DBWR revisited being-written buf 37 0.

0 0.

0.

DBWR tablespace checkpoint buffe 5,415 1.

5 0.

1.

DBWR thread checkpoint buffers w 302,949 84.

1 3.

1.

DBWR transaction table writes.

, Begin End; Buffer Cache: 1,760M: 1,760M: Std Block Size: 8K: Shared Pool Size: 192M: 192M: Log Buffer: 14,356Ktc tablespace checkpoint