问题描述
CREATE TABLE `user_info` (
`id` INT(10) NOT NULL,`doc` JSON NOT NULL,`rev` INT(11) NOT NULL DEFAULT '0',`created_at` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),`updated_at` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),PRIMARY KEY (`id`),INDEX `updated_at` (`updated_at`)
)
COLLATE='utf8mb4_general_ci'
ENGINE=InnoDB;
我只是用它来存储json数据。
json字段的大小从至少15kb逐渐增加到100kb之内的数据。
已确认大约82,317行占据了90 GB。
Name: "user_info" Engine: "InnoDB" Version: 10 Row_format: "Dynamic" Rows: 82317 Avg_row_length: 1095193 Data_length: 90153074688 Max_data_length: 0 Index_length: 3555328 Data_free: 40894464 Auto_increment: null Create_time: "2020-05-19 10:56:14" Update_time: "2020-08-21 07:30:17" Check_time: null Collation: "utf8mb4_general_ci" Checksum: null Create_options: "" Comment: ""
预期的最大磁盘使用量为8 GB。
转储文件大小为1.2 GB，还原后，您使用的是1.9 GB磁盘。
Name: "user_info" Engine: "InnoDB" Version: 10 Row_format: "Dynamic" Rows: 84626 Avg_row_length: 22770 Data_length: 1926987776 Max_data_length: 0 Index_length: 3686400 Data_free: 14680064 Auto_increment: null Create_time: "2020-08-21 07:59:34" Update_time: "2020-08-21 08:02:05" Check_time: null Collation: "utf8mb4_general_ci" Checksum: null Create_options: "" Comment: "
我怀疑json字段正在导致数据库碎片。
我想问一下您是否有类似的经历。
目前，我正在研究如何分配固定长度约为200kb的字段。
session_variables --- | Variable_name | Value | | --- | --- | | innodb_adaptive_flushing | ON | | innodb_adaptive_flushing_lwm | 10 | | innodb_adaptive_hash_index | ON | | innodb_adaptive_hash_index_parts | 8 | | innodb_adaptive_max_sleep_delay | 150000 | | innodb_aggressive_pc | OFF | | innodb_aio_write_slots | 32 | | innodb_api_bk_commit_interval | 5 | | innodb_api_disable_rowlock | OFF | | innodb_api_enable_binlog | OFF | | innodb_api_enable_mdl | OFF | | innodb_api_trx_level | 0 | | innodb_autoextend_increment | 64 | | innodb_autoinc_lock_mode | 1 | | innodb_avoid_logwrite | OFF | | innodb_buffer_pool_chunk_size | 67108864 | | innodb_buffer_pool_dump_at_shutdown | OFF | | innodb_buffer_pool_dump_now | OFF | | innodb_buffer_pool_dump_pct | 25 | | innodb_buffer_pool_filename | ib_buffer_pool | | innodb_buffer_pool_in_core_file | ON | | innodb_buffer_pool_instances | 8 | | innodb_buffer_pool_load_abort | OFF | | innodb_buffer_pool_load_at_startup | OFF | | innodb_buffer_pool_load_now | OFF | | innodb_buffer_pool_size | 3758096384 | | innodb_change_buffer_max_size | 25 | | innodb_change_buffering | all | | innodb_checksum_algorithm | crc32 | | innodb_chunk_write_enabled | OFF | | innodb_cmp_per_index_enabled | OFF | | innodb_commit_concurrency | 0 | | innodb_compression_failure_threshold_pct | 5 | | innodb_compression_level | 6 | | innodb_compression_pad_pct_max | 50 | | innodb_concurrency_tickets | 5000 | | innodb_data_file_path | ibdata1:12M:autoextend | | innodb_data_home_dir | | | innodb_deadlock_detect | ON | | innodb_dedicated_server | OFF | | innodb_default_row_format | dynamic | | innodb_delay_datasync | OFF | | innodb_delay_logwrite | OFF | | innodb_directories | | | innodb_dirty_page_fflush | 10 | | innodb_disable_sort_file_cache | OFF | | innodb_diskfull_wa_enabled | OFF | | innodb_doublewrite | OFF | | innodb_dynamic_page_cleaners | OFF | | innodb_fast0ext_enabled | OFF | | innodb_fast_shutdown | 1 | | innodb_fatal_semaphore_wait_threshold | 600 | | innodb_file_per_table | OFF | | innodb_filesize_update_interval | 0 | | innodb_fill_factor | 100 | | innodb_flush_data_file_before_checkpoint | ON | | innodb_flush_log_at_timeout | 1 | | innodb_flush_log_at_trx_commit | 1 | | innodb_flush_log_checkpoint | ON | | innodb_flush_method | unbuffered | | innodb_flush_neighbors | 0 | | innodb_flush_sync | ON | | innodb_flushing_avg_loops | 30 | | innodb_force_load_corrupted | OFF | | innodb_force_pacing | OFF | | innodb_force_recovery | 0 | | innodb_fs_block_size | 8192 | | innodb_fsync_threshold | 0 | | innodb_ft_aux_table | | | innodb_ft_cache_size | 8000000 | | innodb_ft_enable_diag_print | OFF | | innodb_ft_enable_stopword | ON | | innodb_ft_max_token_size | 84 | | innodb_ft_min_token_size | 3 | | innodb_ft_num_word_optimize | 2000 | | innodb_ft_result_cache_limit | 2000000000 | | innodb_ft_server_stopword_table | | | innodb_ft_sort_pll_degree | 2 | | innodb_ft_total_cache_size | 640000000 | | innodb_ft_user_stopword_table | | | innodb_harness_checkpoint | OFF | | innodb_ignore_fsctl_set_sparse | ON | | innodb_ignore_fsctl_set_zero_data | ON | | innodb_inflight_syncio | 100 | | innodb_io_capacity | 200 | | innodb_io_capacity_calibceil | 300 | | innodb_io_capacity_calibrate | 0 | | innodb_io_capacity_max | 2000 | | innodb_io_hosed_threshold | 2048000 | | innodb_io_throttled_threshold | 2048000 | | innodb_list_dir_files_name_only | OFF | | innodb_lock_wait_timeout | 50 | | innodb_log_buffer_size | 16777216 | | innodb_log_checkpoint_every | 1000 | | innodb_log_checksums | ON | | innodb_log_closer_spin_delay | 0 | | innodb_log_closer_timeout | 1000 | | innodb_log_compressed_pages | ON | | innodb_log_file_size | 268435456 | | innodb_log_files_in_group | 2 | | innodb_log_flush_events | 2048 | | innodb_log_flush_notifier_spin_delay | 0 | | innodb_log_flush_notifier_timeout | 10 | | innodb_log_flusher_spin_delay | 250000 | | innodb_log_flusher_timeout | 10 | | innodb_log_group_home_dir | .\ | | innodb_log_recent_closed_size | 2097152 | | innodb_log_recent_written_size | 1048576 | | innodb_log_spin_cpu_abs_lwm | 80 | | innodb_log_spin_cpu_pct_hwm | 50 | | innodb_log_wait_for_flush_spin_delay | 25000 | | innodb_log_wait_for_flush_spin_hwm | 400 | | innodb_log_wait_for_flush_timeout | 1000 | | innodb_log_wait_for_write_spin_delay | 25000 | | innodb_log_wait_for_write_timeout | 1000 | | innodb_log_write_ahead_size | 8192 | | innodb_log_write_backoff | OFF | | innodb_log_write_events | 2048 | | innodb_log_write_max_size | 4096 | | innodb_log_write_notifier_spin_delay | 0 | | innodb_log_write_notifier_timeout | 10 | | innodb_log_writer_spin_delay | 250000 | | innodb_log_writer_timeout | 10 | | innodb_logwr_prio_checkpoint | 0 | | innodb_lru_scan_depth | 1024 | | innodb_max_dirty_pages_pct | 90.000000 | | innodb_max_dirty_pages_pct_lwm | 10.000000 | | innodb_max_purge_lag | 0 | | innodb_max_purge_lag_delay | 0 | | innodb_max_undo_log_size | 1073741824 | | innodb_min_tsc_freq | 2000 | | innodb_monitor_disable | | | innodb_monitor_enable | | | innodb_monitor_reset | | | innodb_monitor_reset_all | | | innodb_old_blocks_pct | 37 | | innodb_old_blocks_time | 1000 | | innodb_online_alter_log_max_size | 134217728 | | innodb_open_files | 300 | | innodb_optimize_fulltext_only | OFF | | innodb_page_cleaner_priority | 0 | | innodb_page_cleaners | 4 | | innodb_page_cleaners_enforced | 4 | | innodb_page_size | 16384 | | innodb_parallel_read_threads | 4 | | innodb_print_all_deadlocks | OFF | | innodb_print_ddl_logs | OFF | | innodb_purge_batch_size | 300 | | innodb_purge_rseg_truncate_frequency | 128 | | innodb_purge_threads | 4 | | innodb_random_read_ahead | OFF | | innodb_read_ahead_threshold | 56 | | innodb_read_io_threads | 4 | | innodb_read_io_threads_enforced | 4 | | innodb_read_only | OFF | | innodb_read_throttle_hint | OFF | | innodb_redo_log_encrypt | OFF | | innodb_replication_delay | 0 | | innodb_rollback_on_timeout | OFF | | innodb_rollback_segments | 128 | | innodb_skip_check_ibd | OFF | | innodb_sort_buffer_size | 1048576 | | innodb_spin_wait_delay | 6 | | innodb_standalone_systmp | OFF | | innodb_stats_auto_recalc | ON | | innodb_stats_include_delete_marked | OFF | | innodb_stats_method | nulls_equal | | innodb_stats_on_metadata | OFF | | innodb_stats_persistent | ON | | innodb_stats_persistent_sample_pages | 20 | | innodb_stats_transient_sample_pages | 8 | | innodb_status_output | OFF | | innodb_status_output_locks | OFF | | innodb_strict_mode | ON | | innodb_sync_array_size | 1 | | innodb_sync_log_slots | 0 | | innodb_sync_spin_loops | 30 | | innodb_table_locks | ON | | innodb_temp_data_file_path | C:\temp\ibtmp1:12M:autoextend | | innodb_temp_tablespaces_dir | C:\temp\ | | innodb_thread_concurrency | 0 | | innodb_thread_sleep_delay | 10000 | | innodb_tmpdir | C:\temp | | innodb_undo_directory | .\ | | innodb_undo_log_encrypt | OFF | | innodb_undo_log_truncate | ON | | innodb_undo_tablespaces | 2 | | innodb_use_enforced | OFF | | innodb_use_native_aio | ON | | innodb_version | 8.0.15 | | innodb_write_io_threads | 4 | | innodb_write_io_threads_enforced | 4 | | innodb_write_throttle_hint | OFF |
解决方法
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