backendstat — gather OpenDJ backend debugging information

Synopsis

backendstat {subcommand} {options}

Description

This utility can be used to debug a backend.

Options

The backendstat command takes the following options:

-V | --version

Display Directory Server version information.

Default: false

-H | --help

Display this usage information.

Default: false

Subcommands

The backendstat command supports the following subcommands:

backendstat dump-index

Dump records from an index, decoding keys and values. Depending on index size, this subcommand can generate lots of output.

Options

The backendstat dump-index command takes the following options:

-b | --baseDn {baseDN}

The base DN within the backend.

-i | --indexName {indexName}

The name of the index.

-k | --minKeyValue {minKeyValue}

Only show records with keys that should be ordered after the provided value using the comparator for the database container.

-K | --maxKeyValue {maxKeyValue}

Only show records with keys that should be ordered before the provided value using the comparator for the database container.

-n | --backendId {backendName}

The backend ID of the backend.

-p | --skipDecode

Do not try to decode backend data to their appropriate types.

Default: false

-q | --statsOnly

Do not display backend data, just statistics.

Default: false

-s | --minDataSize {minDataSize}

Only show records whose data is no smaller than the provided value.

Default: -1

-S | --maxDataSize {maxDataSize}

Only show records whose data is no larger than the provided value.

Default: -1

-x | --minHexKeyValue {minKeyValue}

Only show records with keys that should be ordered after the provided value using the comparator for the database container.

-X | --maxHexKeyValue {maxKeyValue}

Only show records with keys that should be ordered before the provided value using the comparator for the database container.

backendstat dump-raw-db

Dump the raw records in hexadecimal format for a low-level database within the pluggable backend's storage engine. Depending on index size, this subcommand can generate lots of output.

Options

The backendstat dump-raw-db command takes the following options:

-d | --dbName {databaseName}

The raw database name.

-k | --minKeyValue {minKeyValue}

Only show records with keys that should be ordered after the provided value using the comparator for the database container.

-K | --maxKeyValue {maxKeyValue}

Only show records with keys that should be ordered before the provided value using the comparator for the database container.

-l | --singleLine

Write hexadecimal data on a single line instead of pretty format.

Default: false

-n | --backendId {backendName}

The backend ID of the backend.

-q | --statsOnly

Do not display backend data, just statistics.

Default: false

-s | --minDataSize {minDataSize}

Only show records whose data is no smaller than the provided value.

Default: -1

-S | --maxDataSize {maxDataSize}

Only show records whose data is no larger than the provided value.

Default: -1

-x | --minHexKeyValue {minKeyValue}

Only show records with keys that should be ordered after the provided value using the comparator for the database container.

-X | --maxHexKeyValue {maxKeyValue}

Only show records with keys that should be ordered before the provided value using the comparator for the database container.

backendstat list-backends

List the pluggable backends.

backendstat list-base-dns

List the base DNs in a backend.

Options

The backendstat list-base-dns command takes the following options:

-n | --backendId {backendName}

The backend ID of the backend.

backendstat list-indexes

List the indexes associated with a pluggable backend. This subcommand may take a long time to complete depending on the size of the backend.

Options

The backendstat list-indexes command takes the following options:

-b | --baseDn {baseDN}

The base DN within the backend.

-n | --backendId {backendName}

The backend ID of the backend.

backendstat list-raw-dbs

List the low-level databases within a pluggable backend's storage engine. This subcommand may take a long time to complete depending on the size of the backend.

Options

The backendstat list-raw-dbs command takes the following options:

-n | --backendId {backendName}

The backend ID of the backend.

-u | --useSiUnits

Uses SI Units for printing sizes.

Default: false

backendstat show-index-status

Shows the status of indexes for a backend base DN. This subcommand can take a long time to complete, as it reads all indexes for all backends.

When you run the show-index-status subcommand, the result is a table, followed by a "Total", which is the total number of indexes, followed by a list of indexes with "Over index-entry-limit keys" to show the values for which the number of entries exceeded the index entry limit. The table has the following columns.

Index Name

Name of the index, which takes the form attr.type for attribute indexes, and vlv.name for VLV indexes. Some indexes are for the directory server's internal use.

Example: givenName.caseIgnoreSubstringsMatch:6

Raw DB Name

The internal name of the database within the storage which the directory server is using for the index.

Example: /dc=example,dc=com/givenName.caseIgnoreSubstringsMatch:6

Index Valid

This is true for valid indexes. If this is false, the index might be degraded. Verify the index, and rebuild the index if necessary.

Record Count

Number of indexed keys. Use the backendstat dump-tree command to see how many entry IDs correspond to each key.

Over Index Entry Limit

Number of keys for which there are too many values to maintain an index, based on the index entry limit. This is recorded as - for VLV indexes.

In other words, with the default index entry limit of 4000, if every user in your large directory has an email address ending in @example.com, and a substring index with default substring length of 6 is maintained for mail, then the directory server does not maintain indexes for keys corresponding to substrings in @example.com.

As a result, an LDAP search with the filter "(mail=*@example.com)" becomes an unindexed search even though a substring index exists for the mail attribute. By default the directory server does not allow unindexed searches except by privileged users. This is usually exactly the behavior you want in order to prevent client applications from sending searches that return every user in the directory for example. Clients should refine their search filters instead.

95%, 90%, 85%

Number of keys for which the number of values is approaching the index entry limit, having at least the specified percentage. This is a measure of how full the entry ID lists are.

Options

The backendstat show-index-status command takes the following options:

-b | --baseDn {baseDN}

The base DN within the backend.

-n | --backendId {backendName}

The backend ID of the backend.

Exit Codes

0

The command completed successfully.

> 0

An error occurred.

Examples

The following example displays index information: 

$ backendstat \
 dump-index \
 --backendId userData \
 --baseDn dc=example,dc=com \
 --indexName id2childrencount
Key (len 2): 1#52
Value (len 8): 1
Key (len 2): 2#52
Value (len 8): 500000
Key (len 9): Total Children Count
Value (len 8): 500001

Total Records: 3
Total / Average Key Size: 13 bytes / 4 bytes
Total / Average Data Size: 24 bytes / 8 bytes
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