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WL#14591 InnoDB: Make system variable innodb_open_files dynamic
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- The `innodb_open_files` system variable can now be set with a dynamic SQL procedure `innodb_set_open_files_limit(N)`. If the new value is too low, an error is returned to client with the minimum value presented. If the value is out of bounds or of incorrect type, it will be reported as error also.
- `Fil_system::set_open_files_limit` was added to allow changes to the global opened files limit. The `Fil_system::m_max_n_open` is atomic now and extracted to a separate class `fil::detail::Open_files_limit`, instantiated as `Fil_system::m_open_files_limit`.
- `Fil_shard::open_file` is refactored:
  * Now it has a while loop that waits for the file to be ready to be opened and for all right to open the additional file within the limit acquired. It checks all necessary conditions like `prevent_file_open`.
  * The release of the rights is encapsulated entirely within this method, not like the open_slot in all usages of the `mutex_acquire_and_get_space`.
  * It is assured that we don't open more than 90% of the files that are not ever added to the LRU - this leaves 10% buffer for the system to continue operation with all regular files and not hang.
  * All waits in this method to not spin, instead the sleep for 1ms is performed if we can't have the file opened.
- `Fil_shard::mutex_acquire_and_get_space` is removed - now one just need to get the space object and call `prepare_file_for_io`.
- Removed a TODO comment in the `Fil_shard::file_close_to_free` that related to removed argument in a scenario that is not a problem anymore as there is no open file mutex for some time already.
- `Fil_shard::prepare_file_for_io` has the check for over-booked limit removed.
- `Fil_shard::write_completed` assumes the temporary tablespaces are not buffered and we don't add them to unflushed list.
- `Fil_shard::reserve_open_slot`, Fil_shard::release_open_slot and static Fil_shard::s_open_slot were removed. Now we have CAS-based system of assuring the opened files will not exceed the limit set.
- `Fil_system::close_file_in_all_LRU` uses `Fil_system::s_next_shard_to_close_from_LRU` to distribute file closures from LRU to different shard each time it is called.
- `Fil_shard::open_file` and `Fil_shard::prepare_file_for_io` have the extend parameter removed. It is not needed after `prevent_file_open` was refactored.
- Static `Fil_shard::s_n_spaces_in_lru` is replaced by `Fil_system::s_n_files_not_belonging_in_lru`.
- `Fil_shard::s_files_opened_limit_last_message` is introduced to throttle the number of warnings on long file open globally to one per 10 seconds.
- `Fil_shard::wait_for_io_to_stop` was removed and inlined into `Fil_shard::open_file()` directly. Also, it did not make any sense before, as - `mutex_acquire_and_get_space()` was bumping `file->in_use` before calling `wait_for_io_to_stop()`, which was waiting for the `stop_ios` to be false, while the rename thread could not close the file as it has `in_use` flag, so the rename flag had to reset the `stop_ios` flag. This behaviour is not changed much. We still don't check in `prepare_file_for_io` if the file is about to be renamed to not starve the thread that waits for the file to be able to be renamed.
- `fil_space_t::stop_ios` is renamed to `prevent_file_open` - it was used only when we wanted to prevent tablespace files from being opened, in preparation to rename it.
- `Fil_shard::close_file` has the unused param `LRU_close` removed.
- `Fil_shard::close_files_in_LRU` has the excessive debug logging removed.
- `Fil_shard::file_opened` is partially inlined into `file_open()` and is renamed to `add_to_lru` to match the `remove_from_LRU` counterpart - now it is it's only responsibility and it is used in two places.
- `fil_node_t::in_use` is renamed to `is_being_extended` - it was used only to synchronize file size extension.
- `OS_FILE_TOO_MANY_OPENED` error code is added with the support for windows and POSIX.
- The temporary tablespaces are no longer exempted from the opened files LRU.
- Extracted common logic around dynamic SQL procedures into `srv0dynamic_procedures.h`
- In `Fil_shard::get_file_size` we do not check for `OS_FILE_TOO_MANY_OPENED` - we have a right to open a file already and if it fails we report an error instead of trying to fix the situation.
- Modified `innodb_open_file_hang.test` to additionally open 500 concurrent connections in background. Running them by executing mysql clients in background allow to test more connections than the limit, without hanging the connections like the original mysqltest-based solution did.

RB#26120
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Marcin Babij committed Sep 23, 2021
1 parent ac53fbe commit b184bd3
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2 changes: 1 addition & 1 deletion mysql-test/include/persist_only_variables.sql
View file
Expand Up @@ -43,7 +43,7 @@ set @@persist_only.innodb_ft_total_cache_size=640000000;
set @@persist_only.innodb_log_buffer_size=16777216;
set @@persist_only.innodb_log_file_size=50331648;
set @@persist_only.innodb_log_files_in_group=2;
set @@persist_only.innodb_open_files=1;
set @@persist_only.innodb_open_files=100;
set @@persist_only.innodb_page_cleaners=1;
set @@persist_only.innodb_purge_threads=4;
set @@persist_only.innodb_read_io_threads=4;
Expand Down
4 changes: 2 additions & 2 deletions mysql-test/r/read_only_persisted_plugin_variables.result
View file
Expand Up @@ -38,7 +38,7 @@ set @@persist_only.innodb_ft_total_cache_size=640000000;
set @@persist_only.innodb_log_buffer_size=16777216;
set @@persist_only.innodb_log_file_size=50331648;
set @@persist_only.innodb_log_files_in_group=2;
set @@persist_only.innodb_open_files=1;
set @@persist_only.innodb_open_files=100;
set @@persist_only.innodb_page_cleaners=1;
set @@persist_only.innodb_purge_threads=4;
set @@persist_only.innodb_read_io_threads=4;
Expand Down Expand Up @@ -141,7 +141,7 @@ innodb_ft_total_cache_size 640000000
innodb_log_buffer_size 16777216
innodb_log_file_size 50331648
innodb_log_files_in_group 2
innodb_open_files 1
innodb_open_files 100
innodb_page_cleaners 1
innodb_purge_threads 4
innodb_read_io_threads 4
Expand Down
147 changes: 40 additions & 107 deletions mysql-test/suite/innodb/r/innodb_open_file_hang.result
View file
@@ -1,7 +1,8 @@
SELECT @@innodb_thread_concurrency, @@innodb_open_files;
@@innodb_thread_concurrency @@innodb_open_files
10 40
# Create 100 tables
# Create more tables than open file limit (which is 40) to fill up the
# LRU list.
CREATE TABLE g0(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g1(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g2(id INT PRIMARY KEY) ENGINE=INNODB;
Expand Down Expand Up @@ -52,58 +53,8 @@ CREATE TABLE g46(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g47(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g48(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g49(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g50(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g51(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g52(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g53(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g54(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g55(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g56(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g57(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g58(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g59(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g60(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g61(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g62(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g63(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g64(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g65(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g66(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g67(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g68(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g69(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g70(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g71(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g72(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g73(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g74(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g75(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g76(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g77(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g78(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g79(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g80(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g81(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g82(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g83(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g84(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g85(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g86(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g87(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g88(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g89(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g90(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g91(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g92(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g93(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g94(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g95(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g96(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g97(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g98(id INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE g99(id INT PRIMARY KEY) ENGINE=INNODB;
# Open 100 connections and create a temporary table
# for each connection
# Open 110 connections and create a temporary table
# for each connection.
CREATE TEMPORARY TABLE t1(id INT PRIMARY KEY) ENGINE=INNODB;
INSERT INTO t1 VALUES (1);
CREATE TEMPORARY TABLE t1(id INT PRIMARY KEY) ENGINE=INNODB;
Expand Down Expand Up @@ -304,7 +255,27 @@ CREATE TEMPORARY TABLE t1(id INT PRIMARY KEY) ENGINE=INNODB;
INSERT INTO t1 VALUES (1);
CREATE TEMPORARY TABLE t1(id INT PRIMARY KEY) ENGINE=INNODB;
INSERT INTO t1 VALUES (1);
# Insert rows in tables using multiple connections
CREATE TEMPORARY TABLE t1(id INT PRIMARY KEY) ENGINE=INNODB;
INSERT INTO t1 VALUES (1);
CREATE TEMPORARY TABLE t1(id INT PRIMARY KEY) ENGINE=INNODB;
INSERT INTO t1 VALUES (1);
CREATE TEMPORARY TABLE t1(id INT PRIMARY KEY) ENGINE=INNODB;
INSERT INTO t1 VALUES (1);
CREATE TEMPORARY TABLE t1(id INT PRIMARY KEY) ENGINE=INNODB;
INSERT INTO t1 VALUES (1);
CREATE TEMPORARY TABLE t1(id INT PRIMARY KEY) ENGINE=INNODB;
INSERT INTO t1 VALUES (1);
CREATE TEMPORARY TABLE t1(id INT PRIMARY KEY) ENGINE=INNODB;
INSERT INTO t1 VALUES (1);
CREATE TEMPORARY TABLE t1(id INT PRIMARY KEY) ENGINE=INNODB;
INSERT INTO t1 VALUES (1);
CREATE TEMPORARY TABLE t1(id INT PRIMARY KEY) ENGINE=INNODB;
INSERT INTO t1 VALUES (1);
CREATE TEMPORARY TABLE t1(id INT PRIMARY KEY) ENGINE=INNODB;
INSERT INTO t1 VALUES (1);
CREATE TEMPORARY TABLE t1(id INT PRIMARY KEY) ENGINE=INNODB;
INSERT INTO t1 VALUES (1);
# Insert rows in tables using multiple connections.
INSERT INTO g0 VALUE (0);
INSERT INTO g0 VALUE (1);
INSERT INTO g0 VALUE (2);
Expand Down Expand Up @@ -405,10 +376,22 @@ INSERT INTO g0 VALUE (96);
INSERT INTO g0 VALUE (97);
INSERT INTO g0 VALUE (98);
INSERT INTO g0 VALUE (99);
# Wait for the connections to finish inserting rows
# Cleanup
# Disconnect the connections
INSERT INTO g0 VALUE (100);
INSERT INTO g0 VALUE (101);
INSERT INTO g0 VALUE (102);
INSERT INTO g0 VALUE (103);
INSERT INTO g0 VALUE (104);
INSERT INTO g0 VALUE (105);
INSERT INTO g0 VALUE (106);
INSERT INTO g0 VALUE (107);
INSERT INTO g0 VALUE (108);
INSERT INTO g0 VALUE (109);
# Wait for the connections to finish inserting rows.
# Cleanup.
# Disconnect the connections.
CREATE TABLE connections_done(id INT PRIMARY KEY);
# Drop all the tables
DROP TABLE connections_done;
DROP TABLE g0;
DROP TABLE g1;
DROP TABLE g2;
Expand Down Expand Up @@ -459,53 +442,3 @@ DROP TABLE g46;
DROP TABLE g47;
DROP TABLE g48;
DROP TABLE g49;
DROP TABLE g50;
DROP TABLE g51;
DROP TABLE g52;
DROP TABLE g53;
DROP TABLE g54;
DROP TABLE g55;
DROP TABLE g56;
DROP TABLE g57;
DROP TABLE g58;
DROP TABLE g59;
DROP TABLE g60;
DROP TABLE g61;
DROP TABLE g62;
DROP TABLE g63;
DROP TABLE g64;
DROP TABLE g65;
DROP TABLE g66;
DROP TABLE g67;
DROP TABLE g68;
DROP TABLE g69;
DROP TABLE g70;
DROP TABLE g71;
DROP TABLE g72;
DROP TABLE g73;
DROP TABLE g74;
DROP TABLE g75;
DROP TABLE g76;
DROP TABLE g77;
DROP TABLE g78;
DROP TABLE g79;
DROP TABLE g80;
DROP TABLE g81;
DROP TABLE g82;
DROP TABLE g83;
DROP TABLE g84;
DROP TABLE g85;
DROP TABLE g86;
DROP TABLE g87;
DROP TABLE g88;
DROP TABLE g89;
DROP TABLE g90;
DROP TABLE g91;
DROP TABLE g92;
DROP TABLE g93;
DROP TABLE g94;
DROP TABLE g95;
DROP TABLE g96;
DROP TABLE g97;
DROP TABLE g98;
DROP TABLE g99;
91 changes: 91 additions & 0 deletions mysql-test/suite/innodb/r/innodb_open_files_priv.result
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@@ -0,0 +1,91 @@
SET @start_global_value = @@GLOBAL.innodb_open_files;
SELECT @start_global_value;
@start_global_value
4000
SHOW STATUS LIKE 'SYSTEM_VARIABLES_ADMIN';
Variable_name Value
SELECT * FROM performance_schema.global_status WHERE variable_name like 'SYSTEM_VARIABLES_ADMIN';
VARIABLE_NAME VARIABLE_VALUE
SELECT @@innodb_open_files;
@@innodb_open_files
4000
CREATE USER 'user1'@'localhost' IDENTIFIED BY '123';
GRANT SUPER ON *.* to 'user1'@'localhost';
Warnings:
Warning 1287 The SUPER privilege identifier is deprecated
SHOW GRANTS FOR 'user1'@'localhost';
Grants for user1@localhost
GRANT SUPER ON *.* TO `user1`@`localhost`
SELECT * FROM performance_schema.global_status WHERE variable_name like 'SYSTEM_VARIABLES_ADMIN';
VARIABLE_NAME VARIABLE_VALUE
SELECT @@innodb_open_files ;
@@innodb_open_files
4000
SELECT innodb_set_open_files_limit(10);
innodb_set_open_files_limit(10)
10
SELECT @@innodb_open_files ;
@@innodb_open_files
10
DROP USER 'user1'@'localhost';
CREATE USER 'user1'@'localhost' IDENTIFIED BY '123';
GRANT SYSTEM_VARIABLES_ADMIN ON *.* to 'user1'@'localhost';
SHOW GRANTS FOR 'user1'@'localhost';
Grants for user1@localhost
GRANT USAGE ON *.* TO `user1`@`localhost`
GRANT SYSTEM_VARIABLES_ADMIN ON *.* TO `user1`@`localhost`
SELECT * FROM performance_schema.global_status WHERE variable_name like 'SYSTEM_VARIABLES_ADMIN';
VARIABLE_NAME VARIABLE_VALUE
SELECT @@innodb_open_files ;
@@innodb_open_files
10
SELECT innodb_set_open_files_limit(2147483647);
innodb_set_open_files_limit(2147483647)
2147483647
SELECT @@innodb_open_files ;
@@innodb_open_files
2147483647
DROP USER 'user1'@'localhost';
CREATE USER 'user1'@'localhost' IDENTIFIED BY '123';
GRANT SUPER ON *.* to 'user1'@'localhost';
Warnings:
Warning 1287 The SUPER privilege identifier is deprecated
GRANT SYSTEM_VARIABLES_ADMIN ON *.* to 'user1'@'localhost';
SHOW GRANTS FOR 'user1'@'localhost';
Grants for user1@localhost
GRANT SUPER ON *.* TO `user1`@`localhost`
GRANT SYSTEM_VARIABLES_ADMIN ON *.* TO `user1`@`localhost`
SELECT * FROM performance_schema.global_status WHERE variable_name like 'SYSTEM_VARIABLES_ADMIN';
VARIABLE_NAME VARIABLE_VALUE
SELECT @@innodb_open_files ;
@@innodb_open_files
2147483647
SELECT innodb_set_open_files_limit(4000);
innodb_set_open_files_limit(4000)
4000
SELECT @@innodb_open_files ;
@@innodb_open_files
4000
DROP USER 'user1'@'localhost';
CREATE USER 'user1'@'localhost' IDENTIFIED BY '123';
GRANT CREATE, SELECT, UPDATE, DELETE ON *.* TO 'user1'@'localhost';
SHOW GRANTS FOR 'user1'@'localhost';
Grants for user1@localhost
GRANT SELECT, UPDATE, DELETE, CREATE ON *.* TO `user1`@`localhost`
SELECT * FROM performance_schema.global_status WHERE variable_name like 'SYSTEM_VARIABLES_ADMIN';
VARIABLE_NAME VARIABLE_VALUE
SELECT @@innodb_open_files ;
@@innodb_open_files
4000
SELECT innodb_set_open_files_limit(6000);
ERROR 42000: Access denied; you need (at least one of) the SUPER or SYSTEM_VARIABLES_ADMIN privilege(s) for this operation
SELECT @@innodb_open_files ;
@@innodb_open_files
4000
DROP USER 'user1'@'localhost';
SELECT innodb_set_open_files_limit(@start_global_value);
innodb_set_open_files_limit(@start_global_value)
4000
SELECT @@GLOBAL.innodb_open_files;
@@GLOBAL.innodb_open_files
4000
87 changes: 87 additions & 0 deletions mysql-test/suite/innodb/r/innodb_set_open_files_limit.result
View file
@@ -0,0 +1,87 @@
CREATE UNDO TABLESPACE undo_009 ADD DATAFILE 'undo_009.ibu';
CREATE UNDO TABLESPACE undo_008 ADD DATAFILE 'undo_008.ibu';
CREATE UNDO TABLESPACE undo_007 ADD DATAFILE 'undo_007.ibu';
CREATE UNDO TABLESPACE undo_006 ADD DATAFILE 'undo_006.ibu';
CREATE UNDO TABLESPACE undo_005 ADD DATAFILE 'undo_005.ibu';
CREATE UNDO TABLESPACE undo_004 ADD DATAFILE 'undo_004.ibu';
CREATE UNDO TABLESPACE undo_003 ADD DATAFILE 'undo_003.ibu';
CREATE UNDO TABLESPACE undo_002 ADD DATAFILE 'undo_002.ibu';
CREATE UNDO TABLESPACE undo_001 ADD DATAFILE 'undo_001.ibu';
CREATE UNDO TABLESPACE undo_000 ADD DATAFILE 'undo_000.ibu';
SET @start_global_value = @@GLOBAL.innodb_open_files;
SELECT @start_global_value;
@start_global_value
4000
SELECT innodb_set_open_files_limit(1.1);
ERROR HY000: Can't initialize function 'innodb_set_open_files_limit'; Invalid first argument type.
SELECT innodb_set_open_files_limit(1e1);
ERROR HY000: Can't initialize function 'innodb_set_open_files_limit'; Invalid first argument type.
SELECT innodb_set_open_files_limit('AUTO');
ERROR HY000: Can't initialize function 'innodb_set_open_files_limit'; Invalid first argument type.
SELECT innodb_set_open_files_limit();
ERROR HY000: Can't initialize function 'innodb_set_open_files_limit'; Invalid number of arguments.
SELECT innodb_set_open_files_limit(1, 2);
ERROR HY000: Can't initialize function 'innodb_set_open_files_limit'; Invalid number of arguments.
SELECT innodb_set_open_files_limit(1, 2, 3, 4);
ERROR HY000: Can't initialize function 'innodb_set_open_files_limit'; Invalid number of arguments.
SELECT innodb_set_open_files_limit(NULL);
ERROR HY000: Can't initialize function 'innodb_set_open_files_limit'; First argument must not be null.
select @@global.innodb_open_files;
@@global.innodb_open_files
4000
SELECT innodb_set_open_files_limit(-3);
ERROR HY000: Incorrect arguments to innodb_set_open_files_limit. New limit value can't be smaller than 10.
SELECT innodb_set_open_files_limit(1);
ERROR HY000: Incorrect arguments to innodb_set_open_files_limit. New limit value can't be smaller than 10.
SELECT innodb_set_open_files_limit(3);
ERROR HY000: Incorrect arguments to innodb_set_open_files_limit. New limit value can't be smaller than 10.
SELECT innodb_set_open_files_limit(9);
ERROR HY000: Incorrect arguments to innodb_set_open_files_limit. New limit value can't be smaller than 10.
SELECT innodb_set_open_files_limit(2147483648);
ERROR HY000: Incorrect arguments to innodb_set_open_files_limit. New limit value can't be larger than 2147483647.
SELECT innodb_set_open_files_limit(12342147483647);
ERROR HY000: Incorrect arguments to innodb_set_open_files_limit. New limit value can't be larger than 2147483647.
SELECT innodb_set_open_files_limit(10);
ERROR HY000: Incorrect arguments to innodb_set_open_files_limit. Cannot update innodb_open_files to this value. Not enough files could be closed in last 5 seconds or a number of files that cannot be closed would exceed 90% of the new limit. Consider setting it above 17.
SELECT innodb_set_open_files_limit(16);
ERROR HY000: Incorrect arguments to innodb_set_open_files_limit. Cannot update innodb_open_files to this value. Not enough files could be closed in last 5 seconds or a number of files that cannot be closed would exceed 90% of the new limit. Consider setting it above 17.
SELECT innodb_set_open_files_limit(17);
innodb_set_open_files_limit(17)
17
SELECT innodb_set_open_files_limit(16);
ERROR HY000: Incorrect arguments to innodb_set_open_files_limit. Cannot update innodb_open_files to this value. Not enough files could be closed in last 5 seconds or a number of files that cannot be closed would exceed 90% of the new limit. Consider setting it above 17.
SELECT innodb_set_open_files_limit(2147483647);
innodb_set_open_files_limit(2147483647)
2147483647
SELECT innodb_set_open_files_limit(4000);
innodb_set_open_files_limit(4000)
4000
SELECT innodb_set_open_files_limit(150);
innodb_set_open_files_limit(150)
150
ALTER UNDO TABLESPACE undo_009 SET INACTIVE;
ALTER UNDO TABLESPACE undo_008 SET INACTIVE;
ALTER UNDO TABLESPACE undo_007 SET INACTIVE;
ALTER UNDO TABLESPACE undo_006 SET INACTIVE;
ALTER UNDO TABLESPACE undo_005 SET INACTIVE;
ALTER UNDO TABLESPACE undo_004 SET INACTIVE;
ALTER UNDO TABLESPACE undo_003 SET INACTIVE;
ALTER UNDO TABLESPACE undo_002 SET INACTIVE;
ALTER UNDO TABLESPACE undo_001 SET INACTIVE;
ALTER UNDO TABLESPACE undo_000 SET INACTIVE;
DROP UNDO TABLESPACE undo_009;
DROP UNDO TABLESPACE undo_008;
DROP UNDO TABLESPACE undo_007;
DROP UNDO TABLESPACE undo_006;
DROP UNDO TABLESPACE undo_005;
DROP UNDO TABLESPACE undo_004;
DROP UNDO TABLESPACE undo_003;
DROP UNDO TABLESPACE undo_002;
DROP UNDO TABLESPACE undo_001;
DROP UNDO TABLESPACE undo_000;
SELECT innodb_set_open_files_limit(@start_global_value);
innodb_set_open_files_limit(@start_global_value)
4000
SELECT @@GLOBAL.innodb_open_files;
@@GLOBAL.innodb_open_files
4000

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