PolarDB:Storage layer parameters

loose_enable_gts

Yes

1

[0|1]

Specifies whether to enable the Global Timestamp Service (GTS).

loose_gts_lease

Yes

5000

[0-10000]

The lease period of the GTS.

performance_schema

No

ON

[ON,OFF]

Specifies whether to monitor the performance of the ApsaraDB RDS for MySQL server.

binlog_rows_query_key_content

No

ON

[ON,OFF]

Specifies whether to display SQL statements in binary logs.

loose_polarx_max_allowed_packet

No

16777216

(0-2147483648)

Specifies the size of packets received and sent by the server over proprietary protocols.

innodb_buffer_pool_load_at_startup

Yes

ON

[ON|OFF]

Specifies whether to reload the buffer pool after the server is started.

bulk_insert_buffer_size

No

4194304

[0-4294967295]

The number of records written to the temporary cache when data that is inserted in batches is cached.

show_old_temporals

No

OFF

[ON|OFF]

-

ft_query_expansion_limit

Yes

20

[0-1000]

The maximum number of characters that are matched when full-text searches are performed on MyISAM tables by using WITH QUERY EXPANSION.

innodb_old_blocks_time

No

1000

[0-1024]

The time window after the mid position of a page is read. During the time window, the page can be accessed without being moved to the most recently used end of the least recently used (LRU) list.

innodb_stats_sample_pages

No

8

[1-4294967296]

The interval at which data is collected.

thread_stack

Yes

262144

[131072-18446744073709551615]

The size of memory allocated by PolarDB-X when each connection thread is created.

lc_time_names

No

en_US

[ja_JP|pt_BR|en_US]

The language used to display the names of days, months, and abbreviations.

innodb_thread_concurrency

No

0

[0-1000]

The number of concurrent threads.

default_time_zone

Yes

SYSTEM

[SYSTEM|-12:00|-11:00|-10:00|-9:00|-8:00|-7:00|-6:00|-5:00|-4:00|-3:00|-2:00|-1:00|+0:00|+1:00|+2:00|+3:00|+4:00|+5:00|+5:30|+5:45|+6:00|+6:30|+7:00|+8:00|+9:00|+10:00|+11:00|+12:00|+13:00]

The time zone.

old_passwords

No

0

[0|2]

optimizer_search_depth

No

62

[0-62]

The recursion depth of the optimizer when multiple tables are correlated.

innodb_compression_level

No

6

[0-9]

-

loose_innodb_log_optimize_ddl

No

OFF

[ON|OFF]

-

max_sort_length

No

1024

[4-8388608]

-

slave_pending_jobs_size_max

No

1073741824

[1024-18446744073709551615]

-

innodb_online_alter_log_max_size

No

134217728

[134217728-2147483647]

-

key_cache_block_size

No

1024

[512-16384]

-

mysql_native_password_proxy_users

No

OFF

[ON|OFF]

-

innodb_adaptive_max_sleep_delay

No

150000

[1-1000000]

-

innodb_purge_rseg_truncate_frequency

No

128

[1-128]

-

query_alloc_block_size

No

8192

[1024-16384]

-

innodb_lock_wait_timeout

No

50

[1-1073741824]

-

innodb_purge_threads

Yes

1

[1-32]

-

innodb_compression_failure_threshold_pct

No

5

[0-100]

-

innodb_compression_pad_pct_max

No

50

[0-70]

-

binlog_rows_query_log_events

No

ON

[ON|OFF]

-

innodb_stats_persistent_sample_pages

No

20

[0-4294967295]

-

innodb_ft_total_cache_size

Yes

640000000

[32000000-1600000000]

-

innodb_flush_method

Yes

O_DIRECT

[fsync|O_DSYNC|littlesync|nosync|O_DIRECT|O_DIRECT_NO_FSYNC]

-

eq_range_index_dive_limit

No

10

[0-4294967295]

-

loose_max_execution_time

No

0

[0-4294967295]

-

loose_optimizer_trace_features

No

greedy_search=on,range_optimizer=on,dynamic_range=on,repeated_subselect=on

.*

-

rds_reserved_connections

No

512

[0-512]

-

connect_timeout

No

10

[1-3600]

-

innodb_purge_batch_size

Yes

300

[1-5000]

-

div_precision_increment

No

4

[0-30]

-

avoid_temporal_upgrade

No

OFF

[ON|OFF]

-

innodb_sync_array_size

Yes

1

[1-64]

-

sync_binlog

No

1

[0-2147483647]

-

innodb_stats_method

No

nulls_equal

[nulls_equal|nulls_unequal|nulls_ignored]

-

lock_wait_timeout

No

31536000

[1-1073741824]

-

net_read_timeout

No

30

[1-18446744073709551615]

-

innodb_deadlock_detect

No

ON

[ON|OFF]

-

innodb_write_io_threads

Yes

4

[1-64]

-

end_markers_in_json

No

OFF

[ON|OFF]

-

ngram_token_size

Yes

2

[0-20]

-

loose_innodb_numa_interleave

Yes

ON

[ON|OFF]

-

max_binlog_stmt_cache_size

No

18446744073709547520

[4096-18446744073709547520]

-

innodb_checksum_algorithm

No

crc32

[innodb|crc32|none|strict_innodb|strict_crc32|strict_none]

-

query_cache_type

Yes

0

[0|1|2]

-

innodb_ft_enable_diag_print

No

OFF

[ON|OFF]

-

innodb_ft_enable_stopword

No

ON

[ON|OFF]

-

innodb_io_capacity

No

20000

[0-18446744073709551615]

-

slow_launch_time

No

2

[1-1024]

-

innodb_table_locks

No

ON

[ON|OFF]

-

innodb_stats_persistent

No

ON

[ON|OFF]

-

tmp_table_size

No

2097152

[262144-134217728]

-

disconnect_on_expired_password

Yes

ON

[ON|OFF]

-

default_storage_engine

Yes

InnoDB

[InnoDB|innodb]

-

net_retry_count

No

10

[1-4294967295]

-

innodb_ft_cache_size

Yes

8000000

[1600000-80000000]

-

binlog_cache_size

No

2097152

[4096-16777216]

-

innodb_max_dirty_pages_pct

No

75

[0-99]

-

query_cache_limit

No

1048576

[1-1048576]

-

innodb_disable_sort_file_cache

No

ON

[ON|OFF]

-

innodb_lru_scan_depth

No

1024

[100-18446744073709551615]

-

innodb_ft_result_cache_limit

No

2000000000

[1000000-4294967295]

-

long_query_time

No

1

[0.03-31536000]

-

interactive_timeout

No

7200

[10-86400]

-

innodb_read_io_threads

Yes

4

[1-64]

-

transaction_prealloc_size

No

4096

[1024-131072]

-

open_files_limit

Yes

65535

[1-18446744073709551615]

-

innodb_open_files

Yes

3000

[10-4294967295]

-

max_heap_table_size

No

67108864

[16384-1844674407370954752]

-

automatic_sp_privileges

No

ON

[ON|OFF]

-

explicit_defaults_for_timestamp

No

OFF

[ON|OFF]

-

ft_max_word_len

Yes

84

[10-4294967295]

-

innodb_autoextend_increment

No

64

[1-1000]

-

sql_mode

No

(\s*|REAL_AS_FLOAT|PIPES_AS_CONCAT|ANSI_QUOTES|IGNORE_SPACE|ONLY_FULL_GROUP_BY|NO_UNSIGNED_SUBTRACTION|NO_DIR_IN_CREATE|POSTGRESQL|ORACLE|MSSQL|DB2|MAXDB|NO_KEY_OPTIONS|NO_TABLE_OPTIONS|NO_FIELD_OPTIONS|MYSQL323|MYSQL40|ANSI|NO_AUTO_VALUE_ON_ZERO|NO_BACKSLASH_ESCAPES|STRICT_TRANS_TABLES|STRICT_ALL_TABLES|NO_ZERO_IN_DATE|NO_ZERO_DATE|ALLOW_INVALID_DATES|ERROR_FOR_DIVISION_BY_ZERO|TRADITIONAL|HIGH_NOT_PRECEDENCE|NO_ENGINE_SUBSTITUTION|PAD_CHAR_TO_FULL_LENGTH|NO_AUTO_CREATE_USER)(,NO_AUTO_CREATE_USER|,REAL_AS_FLOAT|,PIPES_AS_CONCAT|,ANSI_QUOTES|,IGNORE_SPACE|,ONLY_FULL_GROUP_BY|,NO_UNSIGNED_SUBTRACTION|,NO_DIR_IN_CREATE|,POSTGRESQL|,ORACLE|,MSSQL|,DB2|,MAXDB|,NO_KEY_OPTIONS|,NO_TABLE_OPTIONS|,NO_FIELD_OPTIONS|,MYSQL323|,MYSQL40|,ANSI|,NO_AUTO_VALUE_ON_ZERO|,NO_BACKSLASH_ESCAPES|,STRICT_TRANS_TABLES|,STRICT_ALL_TABLES|,NO_ZERO_IN_DATE|,NO_ZERO_DATE|,ALLOW_INVALID_DATES|,ERROR_FOR_DIVISION_BY_ZERO|,TRADITIONAL|,HIGH_NOT_PRECEDENCE|,NO_ENGINE_SUBSTITUTION|,PAD_CHAR_TO_FULL_LENGTH)*

-

innodb_stats_transient_sample_pages

No

8

[1-4294967295]

-

innodb_random_read_ahead

No

OFF

[ON|OFF]

-

session_track_state_change

No

OFF

[ON|OFF]

-

table_open_cache

No

2000

[1-524288]

The size of the high-speed cache for table file handles.

range_optimizer_max_mem_size

No

8388608

[0-18446744073709551615]

-

innodb_status_output

No

OFF

[ON|OFF]

-

innodb_log_compressed_pages

No

OFF

[ON|OFF]

-

slave_net_timeout

No

60

[15-300]

-

delay_key_write

No

ON

[ON|OFF|ALL]

-

query_cache_wlock_invalidate

No

OFF

[ON|OFF]

-

max_points_in_geometry

No

65536

[3-1048576]

-

max_prepared_stmt_count

No

16382

[0-1048576]

-

wait_timeout

No

86400

[1-31536000]

-

query_cache_min_res_unit

No

1024

[512-18446744073709551608]

The minimum size of a block that stores query results in the query cache.

innodb_print_all_deadlocks

No

OFF

[OFF|ON]

-

loose_thread_pool_size

No

32

[1-1024]

The number of groups in the thread pool. Default value: 32. Threads in the thread pool are evenly divided into groups and managed by group.

binlog_stmt_cache_size

No

32768

[4096-16777216]

-

transaction_isolation

No

READ-COMMITTED

[READ-UNCOMMITTED|READ-COMMITTED|REPEATABLE-READ|SERIALIZABLE]

The transaction isolation level.

innodb_buffer_pool_dump_at_shutdown

No

ON

[ON|OFF]

-

query_prealloc_size

No

8192

[8192-1048576]

-

key_cache_age_threshold

No

300

[100-4294967295]

-

loose_rds_kill_connections

No

20

[0, 18446744073709551615]

-

transaction_alloc_block_size

No

8192

[1024-131072]

-

optimizer_trace_limit

No

1

[0-4294967295]

-

metadata_locks_cache_size

Yes

1024

[1-1048576]

-

optimizer_prune_level

No

1

[0|1]

-

innodb_max_purge_lag

No

0

[0-4294967295]

-

innodb_buffer_pool_dump_pct

No

25

[1-100]

-

innodb_max_dirty_pages_pct_lwm

No

0

[0-99]

-

max_sp_recursion_depth

No

0

[0-255]

-

innodb_status_output_locks

No

OFF

[ON|OFF]

-

updatable_views_with_limit

No

YES

[YES|NO]

-

binlog_row_image

No

full

[full|minimal]

-

innodb_change_buffer_max_size

No

25

[0-50]

-

innodb_optimize_fulltext_only

No

OFF

[ON|OFF]

-

loose_opt_rds_last_error_gtid

No

ON

[ON|OFF]

-

innodb_ft_max_token_size

Yes

84

[10-84]

-

innodb_max_undo_log_size

No

1073741824

[10485760-18446744073709551615]

-

slave_parallel_type

No

LOGICAL_CLOCK

DATABASE,LOGICAL_CLOCK

-

loose_rds_check_core_file_enabled

No

ON

[ON|OFF]

-

innodb_adaptive_hash_index

No

ON

[ON|OFF]

-

innodb_sync_spin_loops

No

30

[0-4294967295]

-

net_write_timeout

No

60

[1-18446744073709551615]

-

flush_time

No

0

[0-31536000]

-

lower_case_table_names

Yes

1

[0|1]

-

sha256_password_proxy_users

No

OFF

[ON|OFF]

-

character_set_filesystem

No

binary

[utf8|latin1|gbk|binary]

-

innodb_flush_sync

No

ON

[ON|OFF]

-

tls_version

Yes

TLSv1,TLSv1.1,TLSv1.2

[TLSv1,TLSv1.1,TLSv1.2|TLSv1,TLSv1.1]

-

key_cache_division_limit

No

100

[1-100]

-

delayed_insert_timeout

No

300

[1-3600]

-

preload_buffer_size

No

32768

[1024-1073741824]

-

innodb_read_ahead_threshold

No

56

[0-1024]

-

loose_optimizer_switch

No

index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,engine_condition_pushdown=on,index_condition_pushdown=on,mrr=on,mrr_cost_based=on,block_nested_loop=on,batched_key_access=off,materialization=on,semijoin=on,loosescan=on,firstmatch=on,subquery_materialization_cost_based=on,use_index_extensions=on

.*

-

concurrent_insert

No

1

[0|1|2]

Specifies whether to enable concurrent inserts.

block_encryption_mode

No

"aes-128-ecb"

["aes-128-ecb"|"aes-192-ecb"|"aes-256-ecb"|"aes-128-cbc"|"aes-192-cbc"|"aes-256-cbc"]

slow_query_log

No

ON

[ON|OFF]

Specifies whether to record slow query logs.

net_buffer_length

No

16384

[1024-1048576]

-

query_cache_size

No

3145728

[0-104857600]

-

delayed_insert_limit

No

100

[1-4294967295]

-

innodb_large_prefix

No

OFF

[ON|OFF]

-

innodb_monitor_disable

No

all

-

innodb_adaptive_flushing_lwm

No

10

[0-70]

-

innodb_log_checksums

No

ON

[ON|OFF]

-

delayed_queue_size

No

1000

[1-4294967295]

-

session_track_gtids

No

OFF

[OFF|OWN_GTID|ALL_GTIDS]

-

innodb_thread_sleep_delay

No

10000

[0-1000000]

-

loose_rds_set_connection_id_enabled

No

ON

[ON|OFF]

-

innodb_old_blocks_pct

No

37

[5-95]

-

innodb_ft_sort_pll_degree

Yes

2

[1-16]

-

log_slow_admin_statements

No

OFF

[ON|OFF]

-

innodb_stats_on_metadata

No

OFF

[ON|OFF]

-

stored_program_cache

No

256

[16-524288]

-

group_concat_max_len

No

1024

[4-1844674407370954752]

-

innodb_sort_buffer_size

Yes

1048576

[65536-67108864]

-

innodb_page_cleaners

Yes

1

[1-64]

-

innodb_spin_wait_delay

No

6

[0-4294967295]

-

myisam_sort_buffer_size

No

262144

[262144-16777216]

-

innodb_rollback_segments

No

128

[1-128]

-

innodb_commit_concurrency

Yes

0

[0-1000]

-

innodb_concurrency_tickets

No

5000

[1-4294967295]

-

table_definition_cache

No

512

[1-524288]

-

auto_increment_increment

No

1

[1-65535]

-

binlog_checksum

Yes

CRC32

-

-

max_seeks_for_key

No

18446744073709500000

[1-18446744073709551615]

-

sync_relay_log

No

1

[0-2147483647]

-

max_length_for_sort_data

No

1024

[0-838860]

-

back_log

Yes

3000

[0-65535]

-

max_error_count

No

64

[0-65535]

-

innodb_io_capacity_max

No

40000

[0-18446744073709551615]

-

innodb_strict_mode

No

OFF

[ON|OFF]

-

binlog_order_commits

Yes

OFF

-

-

min_examined_row_limit

No

0

[0-4294967295]

-

innodb_ft_min_token_size

Yes

3

[0-16]

-

innodb_stats_auto_recalc

No

ON

[ON|OFF]

-

max_connect_errors

No

100

[0-4294967295]

-

session_track_schema

No

ON

[ON|OFF]

-

join_buffer_size

No

262144

[128-4294967295]

-

innodb_change_buffering

No

all

[none|inserts|deletes|changes|purges|all]

-

optimizer_trace_max_mem_size

No

16384

[0-4294967295]

-

innodb_autoinc_lock_mode

Yes

2

[0|1|2]

-

innodb_rollback_on_timeout

Yes

OFF

[OFF|ON]

-

loose_opt_rds_enable_show_slave_lag

No

ON

[ON|OFF]

-

max_write_lock_count

No

102400

[1-102400]

-

master_verify_checksum

Yes

OFF

-

-

innodb_ft_num_word_optimize

No

2000

[0-10000]

-

max_join_size

No

18446744073709551615

[1-18446744073709551615]

-

loose_validate_password_length

No

8

[1-12]

-

log_throttle_queries_not_using_indexes

No

0

[0-4294967295]

-

innodb_max_purge_lag_delay

No

0

[0-10000000]

-

loose_optimizer_trace

No

enabled=off,one_line=off

.*

-

loose_thread_handling

Yes

one-thread-per-connection

[one-thread-per-connection|pool-of-threads]

-

default_week_format

No

0

[0-7]

-

innodb_cmp_per_index_enabled

No

OFF

[ON|OFF]

-

show_compatibility_56

No

OFF

[ON|OFF]

-

host_cache_size

No

644

[0-65535]

The size of the host cache.

low_priority_updates

No

0

[0|1]

-

auto_increment_offset

No

1

[1-65535]

The auto-increment step size of the auto-increment column.

range_alloc_block_size

No

4096

[4096-18446744073709551615]

-

ft_min_word_len

Yes

4

[1-3600]

-

sort_buffer_size

No

262144

[32768-4294967295]

The size of the sort buffer used to sort data.

max_allowed_packet

No

1073741824

[16384-1073741824]

The maximum size of the packet that can be received by the server.

thread_cache_size

No

256

[0-16384]

The size of the thread cache.

optimizer_trace_offset

No

-1

[0-4294967295]

-

character_set_server

Yes

utf8

[utf8|latin1|gbk|gb18030|utf8mb4]

The character set for databases.

innodb_adaptive_flushing

No

ON

[ON|OFF]

Specifies whether to dynamically adjust the speed at which dirty pages are flushed based on the workload.

log_queries_not_using_indexes

No

OFF

[ON|OFF]

Specifies whether to record queries that do not use indexes in slow query logs.

innodb_monitor_enable

No

all

-

table_open_cache_instances

Yes

16

[1-64]

The number of table cache instances.

innodb_flush_neighbors

No

1

[0|1|2]

Specifies whether to flush neighbor dirty pages of a dirty page to the disk when the dirty page in the buffer pool is flushed. Neighbor dirty pages are in the same extent as the dirty page.

innodb_buffer_pool_instances

Yes

8

[1-64]

The size of each buffer pool instance.

innodb_data_file_purge

No

OFF

[ON|OFF]

Specifies whether to enable the Purge Large File Asynchronously feature.

innodb_data_file_purge_all_at_shutdown

No

OFF

[ON|OFF]

Specifies whether to delete all files when the host on which your PolarDB-X instance is deployed is shut down.

innodb_data_file_purge_immediate

No

OFF

[ON|OFF]

Specifies whether to retain data files and revoke only the links of the data files.

innodb_data_file_purge_interval

No

100

[1-1073741824]

Specifies the interval at which InnoDB deletes files. Unit: milliseconds.

innodb_data_file_purge_max_size

No

512

[1-1073741824]

Specifies the maximum size of a single file that can be deleted. Unit: MB.

hotspot

No

OFF

[ON|OFF]

Specifies whether to enable the hot spot update feature.

hotspot_lock_type

No

OFF

[ON|OFF]

The type of the lock for the hot spot update.

loose_innodb_data_file_purge_interval

No

100

[0-10000]

The interval at which files are purged. Unit: milliseconds.

loose_innodb_data_file_purge_max_size

No

128

[16-1073741824]

The maximum size of a single file that can be purged. Unit: MB.