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Showing entries 1 to 3

Displaying posts with tag: data_dictionary (reset)

Drizzle metadata tables
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Giuseppe has a great post about the Evolution of MySQL metadata, and I thought I’d have a look at what we have in Drizzle. It’s pretty easy to work out how many tables are in each schema, we just query the standard INFORMATION_SCHEMA.TABLES view:

drizzle> select table_schema,count(table_name)
    ->  from information_schema.tables
    -> group by table_schema;
+--------------------+-------------------+
| table_schema       | count(table_name) |
+--------------------+-------------------+
| DATA_DICTIONARY    |                53 |
| INFORMATION_SCHEMA |                20 |
+--------------------+-------------------+
2 rows in set (0 sec)

In Drizzle it’s important to note that

  [Read more...]
Embedded InnoDB: InnoDB Status
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Using the Embedded InnoDB plugin I’m working on, you can use the INNODB_STATUS table function in the data_dictionary, you can do pretty neat things.

For example, we can see that each autocommit transaction causes an fsync and if you insert multiple rows ina  single statement, you still only get 1 fsync:

drizzle> SELECT * FROM DATA_DICTIONARY.INNODB_STATUS
    -> WHERE name="fsync_req_done";
+----------------+-------+
| NAME           | VALUE |
+----------------+-------+
| fsync_req_done |    25 |
+----------------+-------+
1 row in set (0 sec)

drizzle> insert into t1 values (1);
Query OK, 1 row affected (0.05 sec)

drizzle> SELECT * FROM DATA_DICTIONARY.INNODB_STATUS WHERE name="fsync_req_done";
+----------------+-------+
| NAME           | VALUE |
+----------------+-------+
| fsync_req_done |    26 |
+----------------+-------+
1 row in
  [Read more...]
Embedded InnoDB: querying the configuration
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I am rather excited about being able to do awesome things such as this to get the current configuration of your server:

drizzle> SELECT NAME,VALUE
    -> FROM DATA_DICTIONARY.INNODB_CONFIGURATION
    ->  WHERE NAME IN ("data_file_path", "data_home_dir");
+----------------+-------+
| NAME           | VALUE |
+----------------+-------+
| data_file_path | NULL  |
| data_home_dir  | ./    |
+----------------+-------+
2 rows in set (0 sec)

drizzle> SELECT NAME,VALUE
    -> FROM DATA_DICTIONARY.INNODB_CONFIGURATION
    -> WHERE NAME IN ("data_file_path", "data_home_dir");
+----------------+-------+
| NAME           | VALUE |
+----------------+-------+
| data_file_path | NULL  |
| data_home_dir  | ./    |
+----------------+-------+
2 rows in set (0 sec)

drizzle> SELECT NAME,VALUE
    -> FROM
  [Read more...]
Showing entries 1 to 3

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