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    • Table of Contents
    1. General Information
    2. MySQL Installation
    3. Tutorial Introduction
    4. Database Administration
    5. MySQL Optimisation
    6. MySQL Language Reference
    7. MySQL Table Types
    8. MySQL APIs
    9. Extending MySQL
    Chapter 4:  Database Administration 253 Index_length Length of the index le. Data_free Number of allocated but not used bytes. Auto_increment Next autoincrement value. Create_time When the table was created. Update_time When the data le was last updated. Check_time When the table was last checked. Create_options Extra options used with CREATE TABLE. Comment The comment used when creating the table (or some informa- tion why MySQL couldn't access the table information). InnoDB tables will report the free space in the tablespace in the table comment. 4.5.6.3  SHOW STATUS SHOW STATUS  provides server status information (like  mysqladmin extended-status).  The output resembles that shown here, though the format and numbers probably di er: +--------------------------+------------+ | Variable_name | Value | +--------------------------+------------+ | Aborted_clients | 0 | | Aborted_connects | 0 | | Bytes_received | 155372598   | | Bytes_sent | 1176560426 | | Connections | 30023 | | Created_tmp_disk_tables   | 0 | | Created_tmp_tables | 8340 | | Created_tmp_files | 60 | | Delayed_insert_threads | 0 | | Delayed_writes | 0 | | Delayed_errors | 0 | | Flush_commands | 1 | | Handler_delete | 462604 | | Handler_read_first | 105881 | | Handler_read_key | 27820558 | | Handler_read_next | 390681754   | | Handler_read_prev | 6022500 | | Handler_read_rnd | 30546748 | | Handler_read_rnd_next | 246216530   | | Handler_update | 16945404 | | Handler_write | 60356676 | | Key_blocks_used | 14955 | | Key_read_requests | 96854827 | | Key_reads | 162040 | | Key_write_requests | 7589728 | | Key_writes | 3813196 | | Max_used_connections | 0 | | Not_flushed_key_blocks | 0 | | Not_flushed_delayed_rows | 0 |
     

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