diff options
| author | Monty <monty@mariadb.org> | 2018-10-09 18:55:18 +0300 |
|---|---|---|
| committer | Monty <monty@mariadb.org> | 2018-12-09 22:12:25 +0200 |
| commit | 163b34fe25919b25ff83860f30f2440b44c8b53b (patch) | |
| tree | 7d21575247bdba318889ad4bc650028e59549781 /sql/sql_base.h | |
| parent | 306b7a2243eb3c3e8dcc567ef6d4e7e50dca21a4 (diff) | |
| download | mariadb-git-163b34fe25919b25ff83860f30f2440b44c8b53b.tar.gz | |
Optimize flush tables with read lock (FTWRL) to not wait for select's
Part of MDEV-5336 Implement LOCK FOR BACKUP
The idea is that instead of waiting in close_cached_tables() for all
tables to be closed, we instead call flush_tables() that does:
- Flush not used objects in table cache to free memory
- Collect all tables that are open
- Call HA_EXTRA_FLUSH on the objects, to get them into "closed state"
- Added HA_EXTRA_FLUSH support to archive and CSV
- Added multi-user protection to HA_EXTRA_FLUSH in MyISAM and Aria
The benefit compared to old code is:
- FTWRL doesn't have to wait for long running read operations or
open HANDLER's
Diffstat (limited to 'sql/sql_base.h')
| -rw-r--r-- | sql/sql_base.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/sql/sql_base.h b/sql/sql_base.h index bdadb420383..47ca2229af5 100644 --- a/sql/sql_base.h +++ b/sql/sql_base.h @@ -290,6 +290,8 @@ void close_log_table(THD *thd, Open_tables_backup *backup); bool close_cached_tables(THD *thd, TABLE_LIST *tables, bool wait_for_refresh, ulong timeout); +void purge_tables(bool purge_flag); +bool flush_tables(THD *thd); bool close_cached_connection_tables(THD *thd, LEX_CSTRING *connect_string); void close_all_tables_for_name(THD *thd, TABLE_SHARE *share, ha_extra_function extra, |