Oracle 5.0 Reference Manual page 545

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Delayed_errors
The number of rows written with
duplicate key).
•
Delayed_insert_threads
The number of
INSERT DELAYED
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Delayed_writes
The number of
INSERT DELAYED
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Flush_commands
The number of times the server flushes tables, whether because a user executed a
statement or due to internal server operation. It is also incremented by receipt of a
packet. This is in contrast to
been executed, whether
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Handler_commit
The number of internal
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Handler_delete
The number of times that rows have been deleted from tables.
•
Handler_prepare
A counter for the prepare phase of two-phase commit operations. Added in MySQL 5.0.3.
•
Handler_read_first
The number of times the first entry in an index was read. If this value is high, it suggests that the
server is doing a lot of full index scans; for example,
is indexed.
•
Handler_read_key
The number of requests to read a row based on a key. If this value is high, it is a good indication that
your tables are properly indexed for your queries.
•
Handler_read_next
The number of requests to read the next row in key order. This value is incremented if you are
querying an index column with a range constraint or if you are doing an index scan.
•
Handler_read_prev
The number of requests to read the previous row in key order. This read method is mainly used to
optimize
ORDER BY ...
•
Handler_read_rnd
The number of requests to read a row based on a fixed position. This value is high if you are doing a
lot of queries that require sorting of the result. You probably have a lot of queries that require MySQL
to scan entire tables or you have joins that do not use keys properly.
•
Handler_read_rnd_next
The number of requests to read the next row in the data file. This value is high if you are doing a lot
of table scans. Generally this suggests that your tables are not properly indexed or that your queries
are not written to take advantage of the indexes you have.
Server Status Variables
INSERT DELAYED
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handler threads in use.
rows written.
[523], which indicates how many
Com_flush
FLUSH TABLES, FLUSH
statements.
COMMIT
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DESC.
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for which some error occurred (probably
LOGS, and so forth.
SELECT col1 FROM
FLUSH TABLES
COM_REFRESH
statements have
FLUSH
foo, assuming that
col1