diff options
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/ref/explain.sgml | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/doc/src/sgml/ref/explain.sgml b/doc/src/sgml/ref/explain.sgml index 4d758fb237e..857c4e6e867 100644 --- a/doc/src/sgml/ref/explain.sgml +++ b/doc/src/sgml/ref/explain.sgml @@ -174,14 +174,15 @@ ROLLBACK; Include information on buffer usage. Specifically, include the number of shared blocks hit, read, dirtied, and written, the number of local blocks hit, read, dirtied, and written, the number of temp blocks read and - written, and the time spent reading and writing data file blocks - (in milliseconds) if <xref linkend="guc-track-io-timing"/> is enabled. - A <emphasis>hit</emphasis> means that a read was avoided because the block was - found already in cache when needed. + written, and the time spent reading and writing data file blocks and + temporary file blocks (in milliseconds) if + <xref linkend="guc-track-io-timing"/> is enabled. A + <emphasis>hit</emphasis> means that a read was avoided because the block + was found already in cache when needed. Shared blocks contain data from regular tables and indexes; local blocks contain data from temporary tables and indexes; - while temp blocks contain short-term working data used in sorts, hashes, - Materialize plan nodes, and similar cases. + while temporary blocks contain short-term working data used in sorts, + hashes, Materialize plan nodes, and similar cases. The number of blocks <emphasis>dirtied</emphasis> indicates the number of previously unmodified blocks that were changed by this query; while the number of blocks <emphasis>written</emphasis> indicates the number of |