mirror of
https://github.com/MariaDB/server.git
synced 2025-11-30 05:23:50 +03:00
1bd681c8b3
This is a complete rewrite of DROP TABLE, also as part of other DDL, such as ALTER TABLE, CREATE TABLE...SELECT, TRUNCATE TABLE. The background DROP TABLE queue hack is removed. If a transaction needs to drop and create a table by the same name (like TRUNCATE TABLE does), it must first rename the table to an internal #sql-ib name. No committed version of the data dictionary will include any #sql-ib tables, because whenever a transaction renames a table to a #sql-ib name, it will also drop that table. Either the rename will be rolled back, or the drop will be committed. Data files will be unlinked after the transaction has been committed and a FILE_RENAME record has been durably written. The file will actually be deleted when the detached file handle returned by fil_delete_tablespace() will be closed, after the latches have been released. It is possible that a purge of the delete of the SYS_INDEXES record for the clustered index will execute fil_delete_tablespace() concurrently with the DDL transaction. In that case, the thread that arrives later will wait for the other thread to finish. HTON_TRUNCATE_REQUIRES_EXCLUSIVE_USE: A new handler flag. ha_innobase::truncate() now requires that all other references to the table be released in advance. This was implemented by Monty. ha_innobase::delete_table(): If CREATE TABLE..SELECT is detected, we will "hijack" the current transaction, drop the table in the current transaction and commit the current transaction. This essentially fixes MDEV-21602. There is a FIXME comment about making the check less failure-prone. ha_innobase::truncate(), ha_innobase::delete_table(): Implement a fast path for temporary tables. We will no longer allow temporary tables to use the adaptive hash index. dict_table_t::mdl_name: The original table name for the purpose of acquiring MDL in purge, to prevent a race condition between a DDL transaction that is dropping a table, and purge processing undo log records of DML that had executed before the DDL operation. For #sql-backup- tables during ALTER TABLE...ALGORITHM=COPY, the dict_table_t::mdl_name will differ from dict_table_t::name. dict_table_t::parse_name(): Use mdl_name instead of name. dict_table_rename_in_cache(): Update mdl_name. For the internal FTS_ tables of FULLTEXT INDEX, purge would acquire MDL on the FTS_ table name, but not on the main table, and therefore it would be able to run concurrently with a DDL transaction that is dropping the table. Previously, the DROP TABLE queue hack prevented a race between purge and DDL. For now, we introduce purge_sys.stop_FTS() to prevent purge from opening any table, while a DDL transaction that may drop FTS_ tables is in progress. The function fts_lock_table(), which will be invoked before the dictionary is locked, will wait for purge to release any table handles. trx_t::drop_table_statistics(): Drop statistics for the table. This replaces dict_stats_drop_index(). We will drop or rename persistent statistics atomically as part of DDL transactions. On lock conflict for dropping statistics, we will fail instantly with DB_LOCK_WAIT_TIMEOUT, because we will be holding the exclusive data dictionary latch. trx_t::commit_cleanup(): Separated from trx_t::commit_in_memory(). Relax an assertion around fts_commit() and allow DB_LOCK_WAIT_TIMEOUT in addition to DB_DUPLICATE_KEY. The call to fts_commit() is entirely misplaced here and may obviously break the consistency of transactions that affect FULLTEXT INDEX. It needs to be fixed separately. dict_table_t::n_foreign_key_checks_running: Remove (MDEV-21175). The counter was a work-around for missing meta-data locking (MDL) on the SQL layer, and not really needed in MariaDB. ER_TABLE_IN_FK_CHECK: Replaced with ER_UNUSED_28. HA_ERR_TABLE_IN_FK_CHECK: Remove. row_ins_check_foreign_constraints(): Do not acquire dict_sys.latch either. The SQL-layer MDL will protect us. This was reviewed by Thirunarayanan Balathandayuthapani and tested by Matthias Leich.
88 lines
4.1 KiB
Plaintext
88 lines
4.1 KiB
Plaintext
--source include/have_innodb.inc
|
|
--source include/have_sequence.inc
|
|
--source include/big_test.inc
|
|
--source include/not_valgrind.inc
|
|
--source include/not_embedded.inc
|
|
|
|
select @@global.innodb_stats_persistent;
|
|
set global innodb_defragment_stats_accuracy = 20;
|
|
|
|
CREATE TABLE t1(a INT PRIMARY KEY, b VARCHAR(256), KEY SECOND(a, b))
|
|
ENGINE=INNODB;
|
|
INSERT INTO t1 SELECT seq, REPEAT('A', 256) FROM seq_1_to_1024;
|
|
|
|
--echo # Not enough page splits to trigger persistent stats write yet.
|
|
select * from mysql.innodb_index_stats where table_name='t1'
|
|
and stat_name in ('n_page_split','n_pages_freed,n_leaf_pages_defrag');
|
|
|
|
INSERT INTO t1 SELECT seq, REPEAT('A', 256) FROM seq_1025_to_2048;
|
|
|
|
--echo # Persistent stats recorded.
|
|
select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and stat_name in ('n_page_split');
|
|
select * from mysql.innodb_index_stats where table_name = 't1' and stat_name in ('n_pages_freed');
|
|
select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and stat_name in ('n_leaf_pages_defrag');
|
|
|
|
--echo # Delete some rows.
|
|
let $num_delete = 20;
|
|
while ($num_delete)
|
|
{
|
|
let $j = 100 * $num_delete;
|
|
eval delete from t1 where a between $j and $j + 30;
|
|
dec $num_delete;
|
|
}
|
|
|
|
--source include/restart_mysqld.inc
|
|
--echo # Server Restarted
|
|
|
|
--echo # Confirm persistent stats still there after restart.
|
|
select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and stat_name in ('n_page_split');
|
|
select * from mysql.innodb_index_stats where table_name = 't1' and stat_name in ('n_pages_freed');
|
|
select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and stat_name in ('n_leaf_pages_defrag');
|
|
|
|
optimize table t1;
|
|
select sleep(2);
|
|
|
|
select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and stat_name in ('n_page_split');
|
|
select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and stat_name in ('n_pages_freed');
|
|
select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and stat_name in ('n_leaf_pages_defrag');
|
|
|
|
set global innodb_defragment_stats_accuracy = 40;
|
|
|
|
INSERT INTO t1 SELECT seq, REPEAT('A', 256) FROM seq_2049_to_4096;
|
|
|
|
select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and stat_name in ('n_page_split');
|
|
select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and stat_name in ('n_pages_freed');
|
|
select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and stat_name in ('n_leaf_pages_defrag');
|
|
|
|
INSERT INTO t1 SELECT seq, REPEAT('A', 256) FROM seq_4097_to_8192;
|
|
|
|
select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and stat_name in ('n_page_split');
|
|
select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and stat_name in ('n_pages_freed');
|
|
select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and stat_name in ('n_leaf_pages_defrag');
|
|
|
|
|
|
--echo # Table rename should cause stats rename.
|
|
rename table t1 to t2;
|
|
select * from mysql.innodb_index_stats where table_name = 't1';
|
|
|
|
select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't2' and stat_name in ('n_page_split');
|
|
select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't2' and stat_name in ('n_pages_freed');
|
|
select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't2' and stat_name in ('n_leaf_pages_defrag');
|
|
|
|
--echo # Drop index should cause stats drop.
|
|
drop index SECOND on t2;
|
|
|
|
select * from mysql.innodb_index_stats where table_name = 't2' and index_name = 'SECOND';
|
|
|
|
--source include/restart_mysqld.inc
|
|
--echo Server Restarted
|
|
|
|
select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't2' and stat_name in ('n_page_split');
|
|
select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't2' and stat_name in ('n_pages_freed');
|
|
select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't2' and stat_name in ('n_leaf_pages_defrag');
|
|
|
|
--echo # Clean up
|
|
DROP TABLE t2;
|
|
|
|
select * from mysql.innodb_index_stats where table_name = 't2';
|